CN103684380A - Switched capacitor circuit - Google Patents
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- CN103684380A CN103684380A CN201310683847.XA CN201310683847A CN103684380A CN 103684380 A CN103684380 A CN 103684380A CN 201310683847 A CN201310683847 A CN 201310683847A CN 103684380 A CN103684380 A CN 103684380A
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Abstract
The invention discloses a switched capacitor circuit which comprises a charging capacitor module, a discharging capacitor module, a boosting time control module, a charging control module and a discharging control module. Due to the fact that the boosting time control module can control different capacitor values of the charging capacitor module at a charging stage, the charging control module charges a first input signal at the signal input end into the charging capacitor module under the control of the boosting time control module to enable the charging capacitor module to have different electric charge quantities. Furthermore, when the discharging control module controls charging performed by the charging capacitor module to the discharging capacitor module, the discharging capacitor module have different voltages to achieve different boosting ranges of the switched capacitor circuit. One charging capacitor module and one discharging capacitor module are adopted in an existing switched capacitor circuit, and only one boosting range can be achieved. Therefore, compared with existing circuits, the chip area can be decreased, and the power consumption of the switched capacitor circuit can be reduced.
Description
Technical field
The present invention relates to technical field of integrated circuits, espespecially a kind of switched-capacitor circuit.
Background technology
At present, the development along with integrated circuit technique makes the operating voltage of chip more and more lower.Conventionally, the driving voltage of integrated circuit will be higher than the operating voltage of chip, in order to make the operating voltage of chip can meet the driving voltage of integrated circuit, need to adopt booster circuit to realize, and the charge pump circuit as booster circuit adopt switched-capacitor circuit (Switched Capacitor Circuits is called for short SC circuit) to realize conventionally in integrated circuit.The circuit that the switching device that switched-capacitor circuit is controlled by subject clock signal and capacitor form, it utilizes the storage of condenser charge and the boost function that principle of transfer is realized circuit.And the power consumption that is applied to the switched-capacitor circuit in integrated circuit is occupied very large ratio in total power consumption of integrated circuit.Therefore,, along with the requirement of people to electronic product low power consumption, the power consumption that reduces switched-capacitor circuit has become the problem that those skilled in the art need solution badly.
Summary of the invention
A kind of switched-capacitor circuit that the embodiment of the present invention provides, in order to realize a kind of switched-capacitor circuit of low-power consumption.
A kind of switched-capacitor circuit that the embodiment of the present invention provides, comprising: charging capacitor module, discharge capacity module, the multiple control module of boosting, charge control module and control of discharge module; Wherein,
In the charging stage: described charge control module receives the first input signal of signal input part transmission and the second input signal that reference signal end sends, corresponding first end and the second end that outputs to described charging capacitor module, charges to described charging capacitor module respectively; And,
The described multiple control module of boosting is when described the first input signal is less than the threshold voltage of setting, receive described the first input signal and described the second input signal, corresponding the 3rd end and the 4th end that outputs to described charging capacitor module, charges to described charging capacitor module respectively; When described the first input signal is more than or equal to the threshold voltage of setting, described in boost the 3rd end and the 4th end of charging capacitor module described in the conducting of multiple control module;
At discharge regime: described control of discharge module receives described the first input signal, and described the first input signal is outputed to the second end and the 4th end of described charging capacitor module; And by first end and the signal output part conducting of the first end of described charging capacitor module and the 3rd end and described discharge capacity module, described charging capacitor module is charged and by described signal output part output signal to described discharge capacity module; The second termination of wherein said discharge capacity module is received described the second input signal.
The switched-capacitor circuit that the embodiment of the present invention provides, comprising: charging capacitor module, discharge capacity module, the multiple control module of boosting, charge control module and control of discharge module.Due in the charging stage, the multiple control module of boosting can be controlled charging capacitor module and have different capacitances, therefore, under the control of the multiple control module of boosting, the first input signal that charge control module sends signal input part is filled with charging capacitor module, can make charging capacitor module there is the different quantities of electric charge, and then, because charging capacitor module has the different quantities of electric charge, therefore at discharge regime, when control of discharge module controls charging capacitor module is charged to discharge capacity module, can make discharge capacity module there is different voltage, and also different from the voltage of signal output part output, thereby realize switched-capacitor circuit and there is the boost function of amplitude of difference.And in existing switched-capacitor circuit, adopt a charging capacitor module and a discharge capacity module can only realize a kind of amplitude of boosting, and realize the different amplitudes of boosting, need a plurality of switched-capacitor circuits.Therefore, the switched-capacitor circuit that the embodiment of the present invention provides is compared with existing switched-capacitor circuit, can reduce the area of chip, reduces the power consumption of switched-capacitor circuit.
Preferably, for the ease of implementing, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, described charging capacitor module, specifically comprises: the first electric capacity and the second electric capacity; Wherein,
The first end of described the first electric capacity is the first end of described charging capacitor module, and the second end of described the first electric capacity is the 4th end of described charging capacitor module;
The first end of described the second electric capacity is the second end of described charging capacitor module, and the second end of described the second electric capacity is the 3rd end of described charging capacitor module.
Preferably, for the ease of implementing, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, described in the multiple control module of boosting, specifically comprise: the first switching device, second switch device and the 3rd switching device; Wherein,
The input of described the first switching device is connected with the input of described second switch device and the second end of described the first electric capacity respectively; The output of described the first switching device is connected with described reference signal end;
The input of described the 3rd switching device is connected with described signal input part; The output of described the 3rd switching device is connected with the output of described second switch device and the second end of described the second electric capacity respectively;
In the charging stage, when described the first input signal is less than the threshold voltage of setting, described second switch device is in closed condition, and described the first switching device and the 3rd switching device are in conducting state, and described the first electric capacity and described the second electric capacity are in state in parallel; In the charging stage, when described the first input signal is more than or equal to the threshold voltage of setting, described second switch device is in conducting state, and described the first switching device and the 3rd switching device are in closed condition, and described the first electric capacity and described the second electric capacity are in series connection;
At discharge regime, described the first switching device, second switch device and the 3rd switching device are in closed condition.
Preferably, for the ease of implementing, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, described charge control module, specifically comprises: the 4th switching device and the 5th switching device; Wherein,
The input of described the 4th switching device is connected with the input of described the 3rd switching device with described signal input part respectively; The output of described the 4th switching device is connected with the first end of described the first electric capacity;
The input of described the 5th switching device is connected with the first end of described the second electric capacity; The output of described the 5th switching device is connected with described reference signal end;
In the charging stage, described the 4th switching device and the 5th switching device are in conducting state; At discharge regime, described the 4th switching device and the 5th switching device are in closed condition.
Preferably, in order to reduce the substrate current in metal-oxide-semiconductor, and then the quiescent dissipation of reduction switched-capacitor circuit, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, described the first switching device and described the 5th switching device are N-type metal-oxide-semiconductor; Wherein,
The source electrode of described N-type metal-oxide-semiconductor is connected with reference signal end respectively with substrate, described reference signal end ground connection.
Preferably, in order to reduce the substrate current in metal-oxide-semiconductor, and then the quiescent dissipation of reduction switched-capacitor circuit, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, the N-type metal-oxide-semiconductor that described second switch device, described the 3rd switching device and described the 4th switching device are composite construction; Wherein,
The N-type metal-oxide-semiconductor of described composite construction, specifically comprises: the first bulk potential selects pipe, the second bulk potential to select pipe and N-type metal-oxide-semiconductor; Wherein, the source electrode of described N-type metal-oxide-semiconductor selects the source electrode of pipe to be connected with the first bulk potential, the drain electrode of described N-type metal-oxide-semiconductor selects the source electrode of pipe to be connected with the second bulk potential, the substrate of described N-type metal-oxide-semiconductor respectively with the first bulk potential select pipe and the second bulk potential selection pipe drain electrode be connected; Described the first bulk potential selects the substrate of pipe to select the substrate of pipe to be connected with described the second bulk potential.
Preferably, for the ease of implementing, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, described control of discharge module, specifically comprises: the 6th switching device, the 7th switching device, the 8th switching device and the 9th switching device; Wherein,
The input of described the 6th switching device is connected with the input of described the 7th switching device with described signal input part respectively; The output of described the 6th switching device is connected with the second end of described the first electric capacity;
The output of described the 7th switching device is connected with the first end of described the second electric capacity;
The input of described the 8th switching device is connected with the first end of described the first electric capacity; The output of described the 8th switching device is connected with the output of described the 9th switching device, the first end of described discharge capacity module and described signal output part respectively;
The input of described the 9th switching device is connected with the second end of described the second electric capacity;
In the charging stage, described the 6th switching device, the 7th switching device, the 8th switching device and the 9th switching device are in closed condition; At discharge regime, the 6th switching device, the 7th switching device, the 8th switching device and the 9th switching device are in conducting state.
Preferably, for the ease of implementing, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, described the 6th switching device, described the 7th switching device, described the 8th switching device and described the 9th switching device are the identical metal-oxide semiconductor (MOS) metal-oxide-semiconductor of doping polarity.
Preferably, in order to reduce the substrate current in metal-oxide-semiconductor, and then the quiescent dissipation of reduction switched-capacitor circuit, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, described the 6th switching device, described the 7th switching device are P type metal-oxide-semiconductor; Wherein,
The source electrode of described P type metal-oxide-semiconductor is connected with signal input part respectively with substrate.
Preferably, in order to reduce the substrate current in metal-oxide-semiconductor, and then the quiescent dissipation of reduction switched-capacitor circuit, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, the P type metal-oxide-semiconductor that described the 8th switching device and described the 9th switching device are composite construction; Wherein,
The P type metal-oxide-semiconductor of described composite construction, specifically comprises: the first bulk potential selects pipe, the second bulk potential to select pipe and P type metal-oxide-semiconductor; The source electrode of wherein said P type metal-oxide-semiconductor selects the source electrode of pipe to be connected with the first bulk potential, the drain electrode of described P type metal-oxide-semiconductor selects the source electrode of pipe to be connected with the second bulk potential, the substrate of described P type metal-oxide-semiconductor respectively with the first bulk potential select pipe and the second bulk potential selection pipe drain electrode be connected; Described the first bulk potential selects the substrate of pipe to select the substrate of pipe to be connected with described the second bulk potential.
Preferably, for the ease of implementing, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, described discharge capacity module, specifically comprises: the 3rd electric capacity; Wherein,
The first end of described the 3rd electric capacity is the second end of described discharge capacity module, and the second end of described the 3rd electric capacity is the first end of described discharge capacity module.
Accompanying drawing explanation
The structural representation of the switched-capacitor circuit that Fig. 1 provides for the embodiment of the present invention;
The concrete structure schematic diagram of the switched-capacitor circuit that Fig. 2 provides for the embodiment of the present invention;
Fig. 3 a and Fig. 3 b are respectively the working timing figure of the switched-capacitor circuit that the embodiment of the present invention provides;
The structural representation of the N-type metal-oxide-semiconductor of the composite construction that Fig. 4 a provides for the embodiment of the present invention;
The structural representation of the P type metal-oxide-semiconductor of the composite construction that Fig. 4 b provides for the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of the switched-capacitor circuit that the embodiment of the present invention is provided is described in detail.
A kind of switched-capacitor circuit that the embodiment of the present invention provides, as shown in Figure 1, comprising: charging capacitor module 1, discharge capacity module 2, the multiple control module 3 of boosting, charge control module 4 and control of discharge module 5; Wherein,
In the charging stage: charge control module 4 receives the first input signal of signal input part Vin transmission and the second input signal that reference signal end Vref sends, corresponding first end Y1 and the second end Y2 that outputs to charging capacitor module 1, charges to charging capacitor module 1 respectively; And,
Boost multiple control module 3 when the first input signal is less than the threshold voltage of setting, receive the first input signal and the second input signal, corresponding the 3rd end Y3 and the 4th end Y4 that outputs to charging capacitor module 1, charges to charging capacitor module 1 respectively; When the first input signal is more than or equal to the threshold voltage of setting, the 3rd end Y3 and the 4th end Y4 of the multiple control module of boosting 3 conducting charging capacitor modules 1;
At discharge regime: control of discharge module 5 receives the first input signals, and the first input signal is outputed to the second end Y2 and the 4th end Y4 of charging capacitor module 1; And by the first end X1 of the first end Y1 of charging capacitor module 1 and the 3rd end Y3 and discharge capacity module 2 and signal output part Vout conducting, make 1 pair of discharge capacity module 2 of charging capacitor module charge and pass through signal output part Vout output signal; Wherein the second end X2 of discharge capacity module 2 receives the second input signal.
The switched-capacitor circuit that the embodiment of the present invention provides, comprising: charging capacitor module, discharge capacity module, the multiple control module of boosting, charge control module and control of discharge module.Due in the charging stage, the multiple control module of boosting can be controlled charging capacitor module and have different capacitances, therefore, under the control of the multiple control module of boosting, the first input signal that charge control module sends signal input part is filled with charging capacitor module, can make charging capacitor module there is the different quantities of electric charge, and then, because charging capacitor module has the different quantities of electric charge, therefore at discharge regime, when control of discharge module controls charging capacitor module is charged to discharge capacity module, can make discharge capacity module there is different voltage, and also different from the voltage of signal output part output, thereby realize switched-capacitor circuit and there is the boost function of amplitude of difference.And in existing switched-capacitor circuit, adopt a charging capacitor module and a discharge capacity module can only realize a kind of amplitude of boosting, and realize the different amplitudes of boosting, need a plurality of switched-capacitor circuits.Therefore, the switched-capacitor circuit that the embodiment of the present invention provides is compared with existing switched-capacitor circuit, can reduce the area of chip, reduces the power consumption of switched-capacitor circuit.
Particularly, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, when the first input signal is less than the threshold voltage of setting, in the charging stage: charge control module 4 outputs to the first input signal receiving the first end Y1 of charging capacitor module 1, and charging capacitor module 1 is charged; Charge control module 4 outputs to the second input signal receiving the second end Y2 of charging capacitor module 1, and charging capacitor module 1 is charged; The multiple control module 3 of boosting outputs to the first input signal receiving the 3rd end Y3 of charging capacitor module 1, and charging capacitor module 1 is charged; The multiple control module 3 of boosting outputs to the second input signal receiving the 4th end Y4 of charging capacitor module 1, and charging capacitor module 1 is charged.
Preferably, for the ease of implementing, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, as shown in Figure 2, charging capacitor module 1, can specifically comprise: the first capacitor C st1 and the second capacitor C st2; Wherein,
The first end m1 of the first capacitor C st1 is the first end Y1 of charging capacitor module 1, and the second end m2 of the first capacitor C st1 is the 4th end Y4 of charging capacitor module 1;
The first end n1 of the second capacitor C st2 is the second end Y2 of charging capacitor module 1, and the second end n2 of the second capacitor C st2 is the 3rd end Y3 of charging capacitor module.
Further, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, the capacitance of the first capacitor C st1 and the second capacitor C st2 can equate, also can be unequal, at this, do not limit.
Particularly, in the specific implementation, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, charging capacitor module, can specifically comprise: the first electric capacity and the second electric capacity, by the multiple control module of boosting, can control the total capacitance value of the first electric capacity and the second electric capacity, charge control module can realize under the control of the multiple control module of boosting, and the first input signal that signal input part is sent is filled in the first electric capacity and the second electric capacity.Certainly, charging capacitor module, can also be a plurality of electric capacity that can realize the present invention program, at this, does not limit.
Preferably, for the ease of implementing, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, as shown in Figure 2, discharge capacity module 2, specifically can comprise: the 3rd capacitor C st3; Wherein,
The first end o1 of the 3rd capacitor C st3 is the second end X2 of discharge capacity module 2, and the second end o2 of the 3rd capacitor C st3 is the first end X1 of discharge capacity module 2.
Particularly, in the specific implementation, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, discharge capacity module, can specifically comprise: the 3rd electric capacity, thus control of discharge module can be charged to the voltage of charging capacitor module on the 3rd electric capacity, and export from signal output part.Certainly, discharge capacity module, can also be a plurality of electric capacity that can realize the present invention program, at this, does not limit.
Particularly, in the specific implementation, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, the general ground connection of reference signal end Vref, the voltage of the second input signal that reference signal end Vref sends is 0 volt.
Preferably, for the ease of implementing, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, as shown in Figure 2, the multiple control module 3 of boosting, specifically can comprise: the first switching device S1, second switch device S2 and the 3rd switching device S3; Wherein,
The input S1 of the first switching device S1
irespectively with the input S2 of second switch device S2
ibe connected with the second end m2 of the first capacitor C st1; The output S1 of the first switching device S1
ovref is connected with reference signal end;
The input S3 of the 3rd switching device S3
ivin is connected with signal input part; The output S3 of the 3rd switching device S3
orespectively with the output S2 of second switch device S2
obe connected with the second end n2 of the second capacitor C st2;
In the charging stage, when the first input signal is less than the threshold voltage of setting, second switch device S2 is in closed condition, and the first switching device S1 and the 3rd switching device S3 are in conducting state, and the first capacitor C st1 and the second capacitor C st2 are in state in parallel; In the charging stage, when the first input signal is more than or equal to the threshold voltage of setting, second switch device S2 is in conducting state, and the first switching device S1 and the 3rd switching device S3 are in closed condition, and the first capacitor C st1 and the second capacitor C st2 are in series connection;
At discharge regime, the first switching device S1, second switch device S2 and the 3rd switching device S3 are in closed condition.
Particularly, in concrete enforcement, in the above-mentioned switched-capacitor circuit that the embodiment of the present invention is provided, when the first input signal of signal input part Vin transmission is less than the threshold voltage of setting, in the charging stage, second switch device S2 is in closed condition, and the first switching device S1 and the 3rd switching device S3 are in conducting state, and the first capacitor C st1 and the second capacitor C st2 are in state in parallel; At discharge regime, the first switching device S1, second switch device S2 and the 3rd switching device S3 are in closed condition.
When the first input signal of signal input part Vin transmission is more than or equal to the threshold voltage of setting, in the charging stage, second switch device S2 is in conducting state, the first switching device S1 and the 3rd switching device S3 are in closed condition, and the first capacitor C st1 and the second capacitor C st2 are in series connection; At discharge regime, the first switching device S1, second switch device S2 and the 3rd switching device S3 are in closed condition.
Preferably, for the ease of implementing, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, as shown in Figure 2, charge control module 4, can specifically comprise: the 4th switching device S4 and the 5th switching device S5; Wherein,
The input S4 of the 4th switching device S4
ibe connected with signal input part Vin respectively and the input S3 of the 3rd switching device S3
ibe connected; The output S4 of the 4th switching device S4
obe connected with the first end m1 of the first capacitor C st1;
The input S5 of the 5th switching device S5
ibe connected with the first end n1 of the second capacitor C st2; The output S5 of the 5th switching device S5
ovref is connected with reference signal end;
In the charging stage, the 4th switching device S4 and the 5th switching device S5 are in conducting state; At discharge regime, the 4th switching device S4 and the 5th switching device S5 are in closed condition.
Further, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, the voltage of the first input signal that signal input part Vin sends is made as Vss, reference signal end Vref ground connection.When the first input signal is less than the threshold voltage of setting, in the charging stage, second switch device S2 is in closed condition, the first capacitor C st1 and the second capacitor C st2 are in state in parallel, and the first switching device S1, the 3rd switching device S3, the 4th switching device S4 and the 5th switching device S5 are in conducting state; Now, the first end m1 of the first capacitor C st1 is connected with signal input part Vin, the voltage of the first capacitor C st1 first end m1 is Vss, the second end m2 ground connection of the first capacitor C st1, the voltage of first capacitor C st1 the second end m2 is 0, the second end n2 of the second capacitor C st2 is connected with signal input part Vin, the voltage of second capacitor C st2 the second end n2 is Vss, the first end n1 ground connection of the second capacitor C st2, the voltage of the second capacitor C st2 first end n1 is 0, thereby realize, the first input signal of signal input part Vin is charged to the first capacitor C st1 and the second capacitor C st2.
When the first input signal is more than or equal to the threshold voltage of setting, in the charging stage, the first switching device S1 and the 3rd switching device S3 are in closed condition, the first capacitor C st1 and the second capacitor C st2 are in series connection, and second switch device S2, the 4th switching device S4 and the 5th switching device S5 are in conducting state; Now, the first end m1 of the first capacitor C st1 is connected with signal input part Vin, the voltage of the Cst1 first end m1 of the first electric capacity is Vss, the second end m2 of the first capacitor C st1 is connected with the second end n2 of the second capacitor C st2, the first end n1 ground connection of the second capacitor C st2, the voltage of the second capacitor C st2 first end n1 is 0, the Cst1 second end m2 of the first electric capacity and the voltage of second capacitor C st2 the second end n2 are respectively 0.5Vss, thereby realize, the first input signal of signal input part Vin are charged to the first capacitor C st1 and the second capacitor C st2.
To sum up, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, when the first input signal of sending as signal input part Vin is different, the first capacitor C st1 is different with the annexation of the second capacitor C st2, thus also difference of the voltage that is filled into the first capacitor C st1 and the second capacitor C st2.
Preferably, for the ease of implementing, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, as shown in Figure 2, control of discharge module 5, specifically can comprise: the 6th switching device S6, the 7th switching device S7, the 8th switching device S8 and the 9th switching device S9; Wherein,
The input S6 of the 6th switching device S6
irespectively with the input S7 of signal input part Vin and the 7th switching device S7
ibe connected; The output S6 of the 6th switching device S6
obe connected with the second end m2 of the first capacitor C st1;
The output S7 of the 7th switching device S7
obe connected with the first end n1 of the second capacitor C st2;
The input S8 of the 8th switching device S8
ibe connected with the first end m1 of the first capacitor C st1; The output S8 of the 8th switching device S8
orespectively with the output S9 of the 9th switching device S9
o, the first end X1 of discharge capacity module 2 and signal output part Vout be connected;
The input S9 of the 9th switching device S9
ibe connected with the second end n2 of the second capacitor C st2;
In the charging stage, the 6th switching device S6, the 7th switching device S7, the 8th switching device S8 and the 9th switching device S9 are in closed condition; At discharge regime, the 6th switching device S6, the 7th switching device S7, the 8th switching device S8 and the 9th switching device S9 are in conducting state.
Particularly, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, can realize the control to related switch device under varying input signal by selector.Particularly, when the first input signal sending as signal input part Vin is less than the threshold voltage of setting, selector make second switch device S2 at charging stage and discharge regime all in closed condition; In the charging stage, selector makes the first clock control signal control the first switching device S1, the 3rd switching device S3, the 4th switching device S4 and the 5th switching device S5 in conducting state, and selector makes second clock control signal control the 6th switching device S6, the 7th switching device S7, the 8th switching device S8 and the 9th switching device S9 in closed condition; At discharge regime, selector makes the first clock control signal control the first switching device S1, the 3rd switching device S3, the 4th switching device S4 and the 5th switching device S5 in closed condition, and selector makes second clock control signal control the 6th switching device S6, the 7th switching device S7, the 8th switching device S8 and the 9th switching device S9 in conducting state.
When the first input signal sending as signal input part Vin is more than or equal to the threshold voltage of setting, selector make the first switching device S1, the 3rd switching device S3 at charging stage and discharge regime all in closed condition; In the charging stage, selector makes the first clock control signal control second switch device S2, the 4th switching device S4 and the 5th switching device S5 in conducting state, and selector makes second clock control signal control the 6th switching device S6, the 7th switching device S7, the 8th switching device S8 and the 9th switching device S9 in closed condition; At discharge regime, selector makes the first clock control signal control second switch device S2, the 4th switching device S4 and the 5th switching device S5 in closed condition, and selector makes second clock control signal control the 6th switching device S6, the 7th switching device S7, the 8th switching device S8 and the 9th switching device S9 in conducting state.
Further, in the specific implementation, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, the first clock control signal and second clock control signal are the not overlapping clock signal of two-phase, certainly, the first clock control signal and second clock control signal can, for realizing other signal of the present invention program, not limit at this yet.
The specific works principle of the above-mentioned switched-capacitor circuit embodiment of the present invention being provided below by instantiation is described in detail.In following instance, reference signal end Vref ground connection, the capacitance of the first capacitor C st1 and the second capacitor C st2 is equal, and the magnitude of voltage of the first input signal that signal input part Vin sends is Vss.
In the specific implementation, when the voltage Vss of the first input signal is less than the threshold voltage of setting: as shown in Figure 3 a, in figure, V
cLK1be the sequential chart of the first clock control signal CLK1, V
cLK2sequential chart for second clock control signal CLK2, Vin is the sequential chart of the voltage of signal input part Vin, Vm1 is the sequential chart of the voltage of the first capacitor C st1 first end m1, Vm2 is the sequential chart of the voltage of first capacitor C st1 the second end m2, Vn1 is the sequential chart of the voltage of the second capacitor C st2 first end n1, Vn2 is the sequential chart of the voltage of second capacitor C st2 the second end n2, Vo1 is the sequential chart of the voltage of the 3rd capacitor C st3 first end o1, Vo2 is the sequential chart of the voltage of the 3rd capacitor C st1 the second end o2, and Vout is the sequential chart of the voltage of signal output part Vout.
Charging stage T1: second switch device S2 is in closed condition, clock signal clk 1 is controlled the first switching device S1, the 3rd switching device S3, the 4th switching device S4 and the 5th switching device S5 in conducting state, and clock signal clk 2 is controlled the 6th switching device S6, the 7th switching device S7, the 8th switching device S8 and the 9th switching device S9 in closed condition.
Now, the first capacitor C st1 and the second capacitor C st2 are in state in parallel; The second end m2 ground connection of the first capacitor C st1, the voltage Vm2 of first capacitor C st1 the second end m2 is 0, the first end m1 of the first capacitor C st1 is connected with signal input part Vin, the voltage Vss of the first input signal that signal input part Vin sends charges to the first capacitor C st1, and the voltage Vm1 of the first capacitor C st1 first end m1 is Vss; The first end n1 ground connection of the second capacitor C st2, the voltage Vn1 of the second capacitor C st2 first end n1 is 0, the second end n2 of the second capacitor C st2 is connected with signal input part Vin, the voltage Vss of the first input signal that signal input part Vin sends charges to the second capacitor C st2, and the voltage Vn2 of second capacitor C st2 the second end n2 is Vss.
Discharge regime T2: second switch device S2 is in closed condition, clock signal clk 1 is controlled the first switching device S1, the 3rd switching device S3, the 4th switching device S4 and the 5th switching device S5 in closed condition, and clock signal clk 2 is controlled the 6th switching device S6, the 7th switching device S7, the 8th switching device S8 and the 9th switching device S9 conducting state.
Now, the first capacitor C st1 and the second capacitor C st2 are in state in parallel, the second end m2 of the first capacitor C st1 is connected with signal input part Vin, the voltage Vm2 of first capacitor C st1 the second end m2 becomes Vss, the first end m1 of the first capacitor C st1 is connected with output signal end Vout with the second end o2 of the 3rd capacitor C st3 respectively, according to electric capacity principle of conservation of electricity, the voltage Vm1 of the first capacitor C st1 first end m1 becomes 2Vss, the first end n1 of the second capacitor C st2 is connected with signal input part Vin, the voltage Vn1 of the second capacitor C st2 first end n1 becomes Vss, the second end n2 of the second capacitor C st2 is connected with output signal end Vout with the second end o2 of the 3rd capacitor C st3 respectively, according to electric capacity principle of conservation of electricity, the voltage Vn2 of second capacitor C st2 the second end n2 becomes 2Vss.
Due to, the first capacitor C st1 and the second capacitor C st2 are in state in parallel, the first end o1 ground connection of the 3rd capacitor C st3, the second end o2 of the 3rd capacitor C st3 is connected with second capacitor C st2 the second end n2 with the first capacitor C st1 first end m1 respectively, the voltage 2Vss of the voltage 2Vss of the first capacitor C st1 first end m1 and second capacitor C st2 the second end n2 charges to the 3rd capacitor C st3 respectively and exports from signal output part Vout, therefore, the voltage Vo2 of the second end o2 of the 3rd capacitor C st3 is 2Vss, and the magnitude of voltage of signal output part Vout is also 2Vss.
As from the foregoing, when the voltage Vss of the first input signal that the above-mentioned switched-capacitor circuit that the embodiment of the present invention provides sends at signal input part Vin end is less than the threshold voltage of setting, realize the function of 2 times of amplitudes of boosting.
In the specific implementation, when the voltage Vss of the first input signal is more than or equal to the threshold voltage of setting: as shown in Figure 3 b, in figure, V
cLK1be the sequential chart of the first clock control signal CLK1, V
cLK2sequential chart for second clock control signal CLK2, Vin is the sequential chart of the voltage of signal input part Vin, Vm1 is the sequential chart of the voltage of the first capacitor C st1 first end m1, Vm2 is the sequential chart of the voltage of first capacitor C st1 the second end m2, Vn1 is the sequential chart of the voltage of the second capacitor C st2 first end n1, Vn2 is the sequential chart of the voltage of second capacitor C st2 the second end n2, Vo1 is the sequential chart of the voltage of the 3rd capacitor C st3 first end o1, Vo2 is the sequential chart of the voltage of the 3rd capacitor C st1 the second end o2, and Vout is the sequential chart of the voltage of signal output part Vout.
Charging stage T1: the first switching device S1 and the 3rd switching device S3 are in closed condition, clock signal clk 1 control second switch device S2, the 4th switching device S4 and the 5th switching device S5 are in conducting state, and clock signal clk 2 is controlled the 6th switching device S6, the 7th switching device S7, the 8th switching device S8 and the 9th switching device S9 in closed condition.
Now, the first capacitor C st1 and the second capacitor C st2 are in series connection; The first end n1 ground connection of the second capacitor C st2, the voltage Vn1 of the second capacitor C st2 first end n1 is 0, the first end m1 of the first capacitor C st1 is connected with signal input part Vin, the second end m2 of the first capacitor C st1 is connected with the second end n2 of the second capacitor C st2, the voltage Vss of the first input signal that signal input part Vin sends charges to the first capacitor C st1 and the second capacitor C st2, the voltage Vm1 of the first capacitor C st1 first end m1 is Vss, the voltage Vm2 of first capacitor C st1 the second end m2 is 0.5Vss, and the voltage Vn2 of second capacitor C st2 the second end n2 is 0.5Vss.
Discharge regime T2: the first switching device S1 and the 3rd switching device S3 are in closed condition, clock signal clk 1 control second switch device S2, the 4th switching device S4 and the 5th switching device S5 are in closed condition, and clock signal clk 2 is controlled the 6th switching device S6, the 7th switching device S7, the 8th switching device S8 and the 9th switching device S9 in conducting state.
Now, the first capacitor C st1 and the second capacitor C st2 are in state in parallel, the second end m2 of the first capacitor C st1 is connected with signal input part Vin, the voltage Vm2 of first capacitor C st1 the second end m2 becomes Vss, the first end m1 of the first capacitor C st1 is connected with output signal end Vout with the second end o2 of the 3rd capacitor C st3 respectively, according to electric capacity principle of conservation of electricity, the voltage Vm1 of the first capacitor C st1 first end m1 becomes 1.5Vss, the first end n1 of the second capacitor C st2 is connected with signal input part Vin, the voltage Vn1 of the second capacitor C st2 first end n1 becomes Vss, the second end n2 of the second capacitor C st2 is connected with output signal end Vout with the second end o2 of the 3rd capacitor C st3 respectively, according to electric capacity principle of conservation of electricity, the voltage Vn2 of second capacitor C st2 the second end n2 becomes 1.5Vss.
Due to, the first capacitor C st1 and the second capacitor C st2 are in state in parallel, the first end o1 ground connection of the 3rd capacitor C st3, the second end o2 of the 3rd capacitor C st3 is connected with second capacitor C st2 the second end n2 with the first capacitor C st1 first end m1 respectively, the voltage 1.5Vss of the voltage 1.5Vss of the first capacitor C st1 first end m1 and second capacitor C st2 the second end n2 charges to the 3rd capacitor C st3 respectively and exports from signal output part Vout, therefore, the voltage Vo2 of the second end o2 of the 3rd capacitor C st3 is 1.5Vss, and the magnitude of voltage of signal output part Vout is also 1.5Vss.
As from the foregoing, when the voltage Vss of the first input signal that the above-mentioned switched-capacitor circuit that the embodiment of the present invention provides sends at signal input part Vin end is more than or equal to the threshold voltage of setting, realize the function of 1.5 times of amplitudes of boosting.
To sum up, the above-mentioned switched-capacitor circuit that the embodiment of the present invention provides, by the first electric capacity, the second electric capacity and the 3rd electric capacity, both can realize the function of 2 times of amplitudes of boosting, can also realize the function of 1.5 times of amplitudes of boosting, and in existing switched-capacitor circuit, only to realize a kind of amplitude of boosting of situation, in the prior art, realize the function of 2 times of boost amplitude and 1.5 times of amplitudes of boosting, need to design two independent cover switched-capacitor circuits.Therefore, the above-mentioned switched-capacitor circuit that the embodiment of the present invention provides, by multiplexing the first electric capacity, the second electric capacity and the 3rd electric capacity, can realize the function of the amplitude of boosting of two kinds of situations, compare with existing switched-capacitor circuit, can save number of switches, thereby reduce chip area, and reduce the quiescent dissipation of switched-capacitor circuit.
Preferably, for the ease of implementing, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, the first switching device, second switch device, the 3rd switching device, the 4th switching device and the 5th switching device can be the identical metal-oxide semiconductor (MOS) metal-oxide-semiconductor of doping polarity.
Preferably, for the ease of implementing, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, the 6th switching device, the 7th switching device, the 8th switching device and the 9th switching device can be the identical metal-oxide semiconductor (MOS) metal-oxide-semiconductor of doping polarity.
Preferably, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, according to the feature of each switching device, the first switching device and the 5th switching device are N-type metal-oxide-semiconductor; Wherein,
The source electrode of N-type metal-oxide-semiconductor is connected with reference signal end respectively with substrate, reference signal end ground connection.
In the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, the voltage of the input of the first switching device and the 5th switching device is all the time higher than the voltage of output, like this first switching device and the 5th switching device are specifically set to N-type metal-oxide-semiconductor, make the source electrode of N-type metal-oxide-semiconductor and the output that substrate connects respectively switching device, be reference signal end, make the drain electrode of N-type metal-oxide-semiconductor connect the input of switching device.Like this, in N-type metal-oxide-semiconductor, source potential is all the time lower than drain potential, the substrate all the time source electrode lower with current potential is connected, thereby guaranteed that parasitic transistor in N-type metal-oxide-semiconductor is all the time in cut-off state, reduced the substrate current of N-type metal-oxide-semiconductor, and then, the quiescent dissipation of whole switched-capacitor circuit reduced further.
Preferably, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, according to the feature of each switching device, the 6th switching device, the 7th switching device are P type metal-oxide-semiconductor; Wherein,
The source electrode of P type metal-oxide-semiconductor is connected with signal input part respectively with substrate.
In the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, the voltage of the input of the 6th switching device and the 7th switching device is all the time higher than the voltage of output, like this first switching device and the 5th switching device are specifically set to P type metal-oxide-semiconductor, make the source electrode of P type metal-oxide-semiconductor and the input that substrate connects respectively switching device, be signal input part, make the drain electrode of P type metal-oxide-semiconductor connect the output of switching device.Like this, in P type metal-oxide-semiconductor, source potential is all the time higher than drain potential, the substrate all the time source electrode higher with current potential is connected, thereby guaranteed that parasitic transistor in P type metal-oxide-semiconductor is all the time in cut-off state, reduced the substrate current of P type metal-oxide-semiconductor, and then, the quiescent dissipation of whole switched-capacitor circuit reduced further.
Preferably, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, according to the feature of each switching device, the N-type metal-oxide-semiconductor that second switch device, the 3rd switching device and the 4th switching device are composite construction; Wherein,
The N-type metal-oxide-semiconductor of composite construction, as shown in Fig. 4 a, specifically comprises: the first bulk potential selects pipe M1, the second bulk potential to select pipe M2 and N-type metal-oxide-semiconductor M0; Wherein, the source S 0 of N-type metal-oxide-semiconductor M0 selects the source S 1 of pipe M1 to be connected with the first bulk potential, the drain D 0 of N-type metal-oxide-semiconductor M0 selects the source S 2 of pipe M2 to be connected with the second bulk potential, the substrate T0 of N-type metal-oxide-semiconductor M0 respectively with the first bulk potential select pipe M1 and the second bulk potential select to manage M2 drain D 1, D2 be connected; The first bulk potential selects the substrate T1 of pipe M1 to select the substrate T2 of pipe M2 to be connected with the second bulk potential.
In the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, second switch device, the voltage of the input of the 3rd switching device and the 4th switching device fluctuates with respect to the voltage of output, like this by second switch device, the 3rd switching device and the 4th switching device are specifically set to the N-type metal-oxide-semiconductor of composite construction, the source voltage of the N-type metal-oxide-semiconductor in the N-type metal-oxide-semiconductor of composite construction is during higher than drain voltage, the second bulk potential selects pipe to open, the first bulk potential selects pipe to close, the substrate of N-type metal-oxide-semiconductor is connected with drain electrode, the source voltage of the N-type metal-oxide-semiconductor in the N-type metal-oxide-semiconductor of composite construction is during lower than drain voltage, the first bulk potential selects pipe to open, the second bulk potential selects pipe to close, the substrate of N-type metal-oxide-semiconductor is connected with source electrode, thereby guarantee in the N-type metal-oxide-semiconductor of composite construction, the substrate of N-type metal-oxide-semiconductor all the time one end lower with current potential in source-drain electrode is connected, guarantee that the parasitic transistor of N-type metal-oxide-semiconductor is all the time in cut-off state, reduced the substrate current of N-type metal-oxide-semiconductor in the N-type metal-oxide-semiconductor of composite construction, and then, reduced further the quiescent dissipation of whole switched-capacitor circuit.
In like manner, in the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, the P type metal-oxide-semiconductor that the 8th switching device and the 9th switching device are composite construction; Wherein,
The P type metal-oxide-semiconductor of composite construction, as shown in Figure 4 b, specifically comprises: the first bulk potential selects pipe M1, the second bulk potential to select pipe M2 and P type metal-oxide-semiconductor M0; Wherein the source S 0 of P type metal-oxide-semiconductor M0 selects the source S 1 of pipe M1 to be connected with the first bulk potential, the drain D 0 of P type metal-oxide-semiconductor M0 selects the source S 2 of pipe M2 to be connected with the second bulk potential, the substrate T0 of P type metal-oxide-semiconductor M0 respectively with the first bulk potential select pipe M1 and the second bulk potential select to manage M2 drain D 1, D2 be connected; The first bulk potential selects the substrate T1 of pipe M1 to select the substrate T2 of pipe M2 to be connected with the second bulk potential.
In the above-mentioned switched-capacitor circuit providing in the embodiment of the present invention, the voltage of the input of the 8th switching device and the 9th switching device fluctuates with respect to the voltage of output, like this 8th switching device and the 9th switching device are specifically set to the P type metal-oxide-semiconductor of composite construction, the source voltage of the P type metal-oxide-semiconductor in the P of composite construction type metal-oxide-semiconductor is during higher than drain voltage, the first bulk potential selects pipe to open, the second bulk potential selects pipe to close, the substrate of P type metal-oxide-semiconductor is connected with source electrode, the source voltage of the P type metal-oxide-semiconductor in the P of composite construction type metal-oxide-semiconductor is during lower than drain voltage, the second bulk potential selects pipe to open, the first bulk potential selects pipe to close, the substrate of P type metal-oxide-semiconductor is connected with drain electrode, thereby in the P type metal-oxide-semiconductor guaranteeing at composite construction, the substrate of P type metal-oxide-semiconductor all the time one end higher with current potential in source-drain electrode is connected, guarantee that the parasitic transistor of P type metal-oxide-semiconductor is all the time in cut-off state, reduced the substrate current of P type metal-oxide-semiconductor in the P type metal-oxide-semiconductor of composite construction, and then, reduced further the quiescent dissipation of whole switched-capacitor circuit.
The switched-capacitor circuit that the embodiment of the present invention provides, due in the charging stage, the multiple control module of boosting can be controlled charging capacitor module and have different capacitances, therefore, under the control of the multiple control module of boosting, the first input signal that charge control module sends signal input part is filled with charging capacitor module, can make charging capacitor module there is the different quantities of electric charge, and then, because charging capacitor module has the different quantities of electric charge, therefore at discharge regime, when control of discharge module controls charging capacitor module is charged to discharge capacity module, can make discharge capacity module there is different voltage, and also different from the voltage of signal output part output, thereby realize switched-capacitor circuit and there is the boost function of amplitude of difference.And in existing switched-capacitor circuit, adopt a charging capacitor module and a discharge capacity module can only realize a kind of amplitude of boosting, and realize the different amplitudes of boosting, need a plurality of switched-capacitor circuits.Therefore, the switched-capacitor circuit that the embodiment of the present invention provides is compared with existing switched-capacitor circuit, can reduce the area of chip, reduces the power consumption of switched-capacitor circuit.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (12)
1. a switched-capacitor circuit, is characterized in that, comprising: charging capacitor module, discharge capacity module, the multiple control module of boosting, charge control module and control of discharge module; Wherein,
In the charging stage: described charge control module receives the first input signal of signal input part transmission and the second input signal that reference signal end sends, corresponding first end and the second end that outputs to described charging capacitor module, charges to described charging capacitor module respectively; And,
The described multiple control module of boosting is when described the first input signal is less than the threshold voltage of setting, receive described the first input signal and described the second input signal, corresponding the 3rd end and the 4th end that outputs to described charging capacitor module, charges to described charging capacitor module respectively; When described the first input signal is more than or equal to the threshold voltage of setting, described in boost the 3rd end and the 4th end of charging capacitor module described in the conducting of multiple control module;
At discharge regime: described control of discharge module receives described the first input signal, and described the first input signal is outputed to the second end and the 4th end of described charging capacitor module; And by first end and the signal output part conducting of the first end of described charging capacitor module and the 3rd end and described discharge capacity module, described charging capacitor module is charged and by described signal output part output signal to described discharge capacity module; The second termination of wherein said discharge capacity module is received described the second input signal.
2. switched-capacitor circuit as claimed in claim 1, is characterized in that, described charging capacitor module, specifically comprises: the first electric capacity and the second electric capacity; Wherein,
The first end of described the first electric capacity is the first end of described charging capacitor module, and the second end of described the first electric capacity is the 4th end of described charging capacitor module;
The first end of described the second electric capacity is the second end of described charging capacitor module, and the second end of described the second electric capacity is the 3rd end of described charging capacitor module.
3. switched-capacitor circuit as claimed in claim 2, is characterized in that, described in the multiple control module of boosting, specifically comprise: the first switching device, second switch device and the 3rd switching device; Wherein,
The input of described the first switching device is connected with the input of described second switch device and the second end of described the first electric capacity respectively; The output of described the first switching device is connected with described reference signal end;
The input of described the 3rd switching device is connected with described signal input part; The output of described the 3rd switching device is connected with the output of described second switch device and the second end of described the second electric capacity respectively;
In the charging stage, when described the first input signal is less than the threshold voltage of setting, described second switch device is in closed condition, and described the first switching device and described the 3rd switching device are in conducting state, and described the first electric capacity and described the second electric capacity are in state in parallel; In the charging stage, when described the first input signal is more than or equal to the threshold voltage of setting, described second switch device is in conducting state, and described the first switching device and described the 3rd switching device are in closed condition, and described the first electric capacity and described the second electric capacity are in series connection;
At discharge regime, described the first switching device, described second switch device and described the 3rd switching device are in closed condition.
4. switched-capacitor circuit as claimed in claim 3, is characterized in that, described charge control module, specifically comprises: the 4th switching device and the 5th switching device; Wherein,
The input of described the 4th switching device is connected with the input of described the 3rd switching device with described signal input part respectively; The output of described the 4th switching device is connected with the first end of described the first electric capacity;
The input of described the 5th switching device is connected with the first end of described the second electric capacity; The output of described the 5th switching device is connected with described reference signal end;
In the charging stage, described the 4th switching device and described the 5th switching device are in conducting state; At discharge regime, described the 4th switching device and described the 5th switching device are in closed condition.
5. switched-capacitor circuit as claimed in claim 4, it is characterized in that, described the first switching device, described second switch device, described the 3rd switching device, described the 4th switching device and described the 5th switching device are the identical metal-oxide semiconductor (MOS) metal-oxide-semiconductor of doping polarity.
6. switched-capacitor circuit as claimed in claim 5, is characterized in that, described the first switching device and described the 5th switching device are N-type metal-oxide-semiconductor; Wherein,
The source electrode of described N-type metal-oxide-semiconductor is connected with reference signal end respectively with substrate, described reference signal end ground connection.
7. switched-capacitor circuit as claimed in claim 6, is characterized in that, the N-type metal-oxide-semiconductor that described second switch device, described the 3rd switching device and described the 4th switching device are composite construction; Wherein,
The N-type metal-oxide-semiconductor of described composite construction, specifically comprises: the first bulk potential selects pipe, the second bulk potential to select pipe and N-type metal-oxide-semiconductor; Wherein, the source electrode of described N-type metal-oxide-semiconductor selects the source electrode of pipe to be connected with described the first bulk potential, the drain electrode of described N-type metal-oxide-semiconductor selects the source electrode of pipe to be connected with described the second bulk potential, the substrate of described N-type metal-oxide-semiconductor respectively with described the first bulk potential select pipe and described the second bulk potential selection pipe drain electrode be connected; Described the first bulk potential selects the substrate of pipe to select the substrate of pipe to be connected with described the second bulk potential.
8. switched-capacitor circuit as claimed in claim 2, is characterized in that, described control of discharge module, specifically comprises: the 6th switching device, the 7th switching device, the 8th switching device and the 9th switching device; Wherein,
The input of described the 6th switching device is connected with the input of described the 7th switching device with described signal input part respectively; The output of described the 6th switching device is connected with the second end of described the first electric capacity;
The output of described the 7th switching device is connected with the first end of described the second electric capacity;
The input of described the 8th switching device is connected with the first end of described the first electric capacity; The output of described the 8th switching device is connected with the output of described the 9th switching device, the first end of described discharge capacity module and described signal output part respectively;
The input of described the 9th switching device is connected with the second end of described the second electric capacity;
In the charging stage, described the 6th switching device, described the 7th switching device, described the 8th switching device and described the 9th switching device are in closed condition; At discharge regime, described the 6th switching device, described the 7th switching device, described the 8th switching device and described the 9th switching device are in conducting state.
9. switched-capacitor circuit as claimed in claim 8, is characterized in that, described the 6th switching device, described the 7th switching device, described the 8th switching device and described the 9th switching device are the identical metal-oxide semiconductor (MOS) metal-oxide-semiconductor of doping polarity.
10. switched-capacitor circuit as claimed in claim 9, is characterized in that, described the 6th switching device, described the 7th switching device are P type metal-oxide-semiconductor; Wherein,
The source electrode of described P type metal-oxide-semiconductor is connected with signal input part respectively with substrate.
11. switched-capacitor circuits as claimed in claim 10, is characterized in that, the P type metal-oxide-semiconductor that described the 8th switching device and described the 9th switching device are composite construction; Wherein,
The P type metal-oxide-semiconductor of described composite construction, specifically comprises: the first bulk potential selects pipe, the second bulk potential to select pipe and P type metal-oxide-semiconductor; The source electrode of wherein said P type metal-oxide-semiconductor selects the source electrode of pipe to be connected with described the first bulk potential, the drain electrode of described P type metal-oxide-semiconductor selects the source electrode of pipe to be connected with described the second bulk potential, the substrate of described P type metal-oxide-semiconductor respectively with described the first bulk potential select pipe and described the second bulk potential selection pipe drain electrode be connected; Described the first bulk potential selects the substrate of pipe to select the substrate of pipe to be connected with described the second bulk potential.
12. switched-capacitor circuits as described in claim 1-11 any one, is characterized in that, described discharge capacity module, specifically comprises: the 3rd electric capacity; Wherein,
The first end of described the 3rd electric capacity is the second end of described discharge capacity module, and the second end of described the 3rd electric capacity is the first end of described discharge capacity module.
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