CN102183989B - Self-adaptive current control device - Google Patents
Self-adaptive current control device Download PDFInfo
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- CN102183989B CN102183989B CN 201110094396 CN201110094396A CN102183989B CN 102183989 B CN102183989 B CN 102183989B CN 201110094396 CN201110094396 CN 201110094396 CN 201110094396 A CN201110094396 A CN 201110094396A CN 102183989 B CN102183989 B CN 102183989B
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Abstract
The invention discloses a self-adaptive current control device in the technical field of integrated circuits. The self-adaptive current control device comprises an external resistor current source, a built-in resistor current source, a judging unit, a first switch unit, a second switch unit, a switch control unit, a current mirror unit and an output unit, wherein the judging unit is used for judging whether an external resistor is available or not; the switch control unit is used for controlling the on/off of the first switch unit and the second switch unit, when the external resistor is judged to be available by the judging unit, the switch control unit switches on the first switch unit and switches off the second switch unit, and the external resistor is judged to be unavailable by the judging unit, the switch control unit switches on the second switch unit and switches off the first switch unit; and the current mirror unit is used for outputting the mirror current of external resistor current and the mirror current of built-in resistor current. The self-adaptive current control device disclosed by the invention can be used for automatically realizing the output control over current without a special external control signal, so that the realization method is simple, the production cost is reduced, and the use flexibility, the speed and the sensitivity of the self-adaptive current control device are increased.
Description
Technical field
The present invention relates to technical field of integrated circuits, relate in particular to a kind of current automatic adaptation control device.
Background technology
In integrated circuit, often need to export constant electric current to corresponding device, this constant current requirements changes insensitive to condition of work and external condition.Such as: the supply voltage of variation, temperature, technique etc. cause the variation that output current produces, and almost can ignore.Constant electric current can produce with constant voltage and constant resistance.
Prior art has dual mode to realize constant electric current, and a kind of is to adopt the outer discrete resistors of integrated circuit to produce constant electric current, and then amplifies the steady current that obtains amplifying through the proportional current mirror; Another kind is then to adopt the built-in resistor of integrated circuit to produce constant electric current, and then amplifies the steady current that obtains amplifying through the proportional current mirror.
But regulate in the application at now a lot of electric currents, it is adjustable both to satisfy outer meeting resistance to current generating circuit, satisfies again without outer meeting resistance the time independently to produce output current.Referring to shown in Figure 1, a kind of embodiment of existing current automatic adaptation circuit comprises:
Outer meeting resistance current source 100 is used for providing the electric current of the outer meeting resistance when having outer meeting resistance, comprising: the reference voltage generation unit; Operational amplifier A, its positive input connects the output terminal of reference voltage generation unit; The one NMOS manages N1 ', the output terminal of its grid concatenation operation amplifier A, and the reverse input end of its source electrode concatenation operation amplifier A, its drain electrode is as the output terminal of outer meeting resistance current source; The outer meeting resistance link, source electrode and the outer meeting resistance R of the reverse input end of concatenation operation amplifier A, NMOS pipe N1 '; The electric current of described outer meeting resistance current source output terminal output is I1, described I1=V1/R, and wherein: V1 is the voltage that the reference voltage generation unit produces, and R is the resistance of outer meeting resistance R;
Built-in resistor current source 200, be used for providing the electric current of the built-in resistor when not having outer meeting resistance, comprise: current source I2, the 2nd NMOS pipe N2 ' and the 3rd NMOS pipe N3 ', wherein: the grid of the source electrode of the output terminal of current source I2, the 2nd NMOS pipe N2 ', the grid of the 2nd NMOS pipe N2 ' and the 3rd NMOS pipe N3 ' links to each other, the grounded drain of the drain electrode of the 2nd NMOS pipe N2 ' and the 3rd NMOS pipe N3 ', the grid output current I2 of the 2nd NMOS pipe N2 ';
The first current lens unit 300, its input end links to each other with the output terminal of outer meeting resistance current source 100, be used for the electric current I 1 of outer meeting resistance current source 100 outputs is carried out mirror image, comprise: PMOS pipe P1 ' and the 2nd PMOS pipe P2 ', wherein: the source electrode of PMOS pipe P1 ' connects voltage source V CC with the source electrode of the 2nd PMOS pipe P2 ', the grid of the drain electrode of the grid of the one PMOS pipe P1 ', PMOS pipe P1 ', the 2nd PMOS pipe P2 ' and the output terminal of outer meeting resistance current source 100 link to each other, the image current of the drain electrode output current I1 of the 2nd PMOS pipe P2 ';
The second current lens unit 400, its input end connects built-in resistor current source 200, be used for the electric current I 2 of built-in resistor current source 200 outputs is carried out mirror image, comprise: the 3rd PMOS pipe P3 ' and the 4th PMOS pipe P4 ', wherein: the source electrode of the 3rd PMOS pipe P3 ' connects voltage source V CC with the source electrode of the 4th PMOS pipe P4 ', the grid of the drain electrode of the grid of the 3rd PMOS pipe P3 ', the 3rd PMOS pipe P3 ', the 4th PMOS pipe P4 ' and the output terminal of built-in resistor current source 200 link to each other, the image current of the drain electrode output current I2 of the 4th PMOS pipe P4 ';
Selected cell 500, be used for selecting output outer meeting resistance electric current or built-in resistor electric current, comprise: input port S, phase inverter, the 5th PMOS pipe P5 ' and the 6th PMOS pipe P6 ', wherein: input port S connects the grid of the 5th PMOS pipe P5 ' and the input end of phase inverter, the source electrode of the 5th PMOS pipe P5 ' connects voltage source V CC with the source electrode of the 6th PMOS pipe P6 ', the drain electrode of the 5th PMOS pipe P5 ', the grid of the one PMOS pipe P1 ', the drain electrode of the one PMOS pipe P1 ', the grid of the 2nd PMOS pipe P2 ' and the output terminal of outer meeting resistance current source 100 link to each other, the drain electrode of the 6th PMOS pipe P6 ', the grid of the 3rd PMOS pipe P3 ', the drain electrode of the 3rd PMOS pipe P3 ', the grid of the 4th PMOS pipe P4 ' and the output terminal of built-in resistor current source 200 link to each other;
Above-mentioned technology must number be come to the special external control of input port S input the voltage status of control inputs port S, thereby determine it is the image current of output outer meeting resistance current source, still export the image current of built-in resistor current source, this has just limited the dirigibility of its use greatly, and has increased the realization cost.
Summary of the invention
The problem that the present invention solves is, a kind of current automatic adaptation control device is provided, and whether automatic decision exists outer meeting resistance, when having outer meeting resistance, automatically exports the image current of outer meeting resistance current source; When not having outer meeting resistance, automatically export the image current of built-in resistor current source.
For addressing the above problem, the invention provides a kind of current automatic adaptation control device, comprising:
The outer meeting resistance current source is used for providing the electric current of the outer meeting resistance when having outer meeting resistance;
The built-in resistor current source is used for providing the electric current of the built-in resistor when not having outer meeting resistance, comprises two output terminals;
Judging unit, its input end connects the outer meeting resistance current source and receives reference voltage, be used for judging whether to exist outer meeting resistance, when the voltage of described outer meeting resistance current source and described judging unit tie point during less than described reference voltage, there is outer meeting resistance in judgement; When the voltage of described outer meeting resistance current source and described judging unit tie point during greater than described reference voltage, judge not have outer meeting resistance;
The first switch element, the one end connects the outer meeting resistance current source, and the other end connects current lens unit;
The second switch unit, the one end connects the first output terminal of built-in resistor current source, and the other end connects current lens unit;
Current lens unit, its input end connects the first switch element and second switch unit, when the unlatching of the first switch element, when the second switch unit is closed, the outer meeting resistance electric current that the outer meeting resistance current source is provided carries out mirror image, obtains the image current of outer meeting resistance electric current; When the first switch element is closed, when the second switch unit is opened, the built-in resistor electric current that built-in resistor current source is provided carries out mirror image, obtains the image current of built-in resistor electric current; Described current lens unit comprises two output terminals;
Switch control unit, the first output terminal of the output terminal of its input end connection judgment unit, the second output terminal of built-in resistor current source and current lens unit, the electric current of the electric current of the first output terminal of described current lens unit and described built-in resistor current source the second output terminal is unequal, the output terminal of described switch control unit connects the first switch element and second switch unit, the On/Off that is used for control the first switch element and second switch unit, when there is outer meeting resistance in judgment unit judges, the first switch element is opened, and the second switch unit is closed; When there is not outer meeting resistance in judgment unit judges, the second switch unit is opened, the first switch element is closed;
Output unit, the second output terminal of connection current lens unit is used for the image current of output outer meeting resistance electric current or the image current of built-in resistor electric current.
Alternatively, described switch control unit comprises: initialization unit, the first rejection gate, the second rejection gate, phase inverter, initial control end, judgement control end, Circumscribing port and built-in control end, wherein: described initialization unit connects the input end of initial control end, during initialization, described initialization unit gives described initial control end high level state; After the initialization, described initialization unit gives described initial control end low level; The output terminal of described initial control end connects the input end of the first rejection gate, the output terminal of the first rejection gate connects built-in control end, the output terminal of described built-in control end connects the input end of second switch unit, the second rejection gate and phase inverter, and described built-in control end is used for the On/Off of control second switch and the state of Circumscribing port; The output terminal of described phase inverter connects the input end of Circumscribing port, and the output terminal of Circumscribing port connects the first switch element, and described Circumscribing port is used for the On/Off of control the first switch element; The output terminal of the input end connection judgment unit of described judgement control end, the output terminal of described judgement control end connects the input end of the second rejection gate, and the output terminal of the second rejection gate connects the input end of the first rejection gate.
Alternatively, described outer meeting resistance current source comprises: the first operational amplifier, NMOS pipe and outer meeting resistance link, wherein: the positive input input reference voltage of the first operational amplifier; The grid of the one NMOS pipe connects the output terminal of the first operational amplifier, and its source electrode connects the reverse input end of the first operational amplifier, and its drain electrode is as the output terminal of outer meeting resistance current source; The outer meeting resistance link connects the reverse input end of the first operational amplifier and the source electrode of a NMOS pipe.
Alternatively, described built-in resistor current source comprises: the first current source, the 2nd NMOS pipe, the 3rd NMOS pipe and the 4th NMOS pipe, wherein: the output terminal of the first current source, the drain electrode of the 2nd NMOS pipe, the grid of the 2nd NMOS pipe, the grid of the 3rd NMOS pipe links to each other with the grid of the 4th NMOS pipe, the source electrode of the 2nd NMOS pipe, the source ground of the source electrode of the 3rd NMOS pipe and the 4th NMOS pipe, the drain electrode of described the 3rd NMOS pipe is as the first output terminal of described built-in resistor current source, and the drain electrode of described the 4th NMOS pipe N4 is as the second output terminal of described built-in resistor current source.
Alternatively, when the input current of described current lens unit equated with the electric current of its first output terminal, described the 3rd NMOS pipe and the 4th NMOS pipe satisfied following relation: W
N3* L
N4≠ W
N4* L
N3, wherein: W
N3The channel width of the 3rd NMOS pipe, L
N3The channel length of the 3rd NMOS pipe, L
N4The channel length of the 4th NMOS pipe, W
N4It is the channel width of the 4th NMOS pipe.
Alternatively, described judging unit comprises: the second current source, the 3rd switch element, the second operational amplifier and the first electric capacity, wherein: the output terminal of the second current source connects the 3rd switch element, the 3rd switch element, the reverse input end of the second operational amplifier, one end of the first electric capacity links to each other with the outer meeting resistance current source, the positive input input reference voltage of the second operational amplifier, the other end ground connection of the first electric capacity, the output terminal connection judgment control port of the second operational amplifier, during described switch control unit initialization, described the 3rd switch element is opened, and satisfies
Wherein: R is the resistance of outer meeting resistance, I
B2Be the electric current that the second current source provides, V1 is reference voltage.
Alternatively, described the 3rd switch element comprises the 8th PMOS pipe, the source electrode of described the 8th PMOS pipe connects the output terminal of described the second current source, one end of the reverse input end of the drain electrode of described the 8th PMOS pipe, the second operational amplifier, the first electric capacity links to each other with the outer meeting resistance current source, and the grid of described the 8th PMOS pipe connects built-in control end.
Alternatively, described the 3rd switch element comprises the 5th NMOS pipe, the drain electrode of described the 5th NMOS pipe connects the output terminal of described the second current source, one end of the reverse input end of the source electrode of described the 5th NMOS pipe, the second operational amplifier, the first electric capacity links to each other with the outer meeting resistance current source, and the grid of described the 5th NMOS pipe connects Circumscribing port.
Alternatively, described the first switch element comprises: the 4th PMOS pipe and the 5th PMOS pipe, wherein: the grid of the grid of the 4th PMOS pipe and the 5th PMOS pipe connects the Circumscribing port mouth, the drain electrode of the drain electrode of the 4th PMOS pipe and the 5th PMOS pipe connects the output terminal of outer meeting resistance current source, and the source electrode of the source electrode of the 4th PMOS pipe and the 5th PMOS pipe connects the input end of current lens unit.
Alternatively, described second switch unit comprises: the 6th PMOS pipe and the 7th PMOS pipe, wherein: the grid of the grid of the 6th PMOS pipe and the 7th PMOS pipe connects built-in control port, the drain electrode of the drain electrode of the 6th PMOS pipe and the 7th PMOS pipe connects the output terminal of built-in resistor current source, and the source electrode of the source electrode of the 6th PMOS pipe and the 7th PMOS pipe connects the input end of current lens unit.
Alternatively, described initialization unit comprises: Schmidt trigger and the second electric capacity, wherein: an end ground connection of the second electric capacity, the input end of the second output terminal of the other end of the second electric capacity, built-in resistor current source, the first output terminal of current lens unit and Schmidt trigger links to each other, and the output terminal of described Schmidt trigger connects initial control end.
Alternatively, described initialization unit comprises: comparer and the second electric capacity, wherein: an end ground connection of the second electric capacity, the positive input of the second output terminal of the other end of the second electric capacity, built-in resistor current source, the first output terminal of current lens unit and comparer links to each other, the output terminal of described comparer connects initial control end, the reverse input end input threshold voltage of described comparer, when the voltage of described comparer positive input during less than described threshold voltage, the state of described initial control end is high level; When the voltage of described comparer positive input during greater than described threshold voltage, the state of described initial control end is low level.
Alternatively, described current lens unit comprises: PMOS pipe, the 2nd PMOS pipe and the 3rd PMOS pipe, wherein: the grid of a PMOS pipe, the grid of the 2nd PMOS pipe, the drain electrode of the grid of the 3rd PMOS pipe and a PMOS pipe connects, the source electrode of the one PMOS pipe, the source electrode of the source electrode of the 2nd PMOS pipe and the 3rd PMOS pipe connects voltage source, the drain electrode of the 2nd PMOS pipe is as the first output terminal of current lens unit, the drain electrode of the 3rd PMOS pipe is as the second output terminal of current lens unit, the drain electrode of the 3rd PMOS pipe connects the input end of output unit, and the drain electrode of a PMOS pipe is as the input end of current lens unit.
Compared with prior art, the present invention has the following advantages:
1) the present invention has increased judging unit, whether there is outer meeting resistance by judging unit, and then the information that obtains according to judging unit of switch control unit, realization is to the control of the first switch element and second switch unit, so that the outer meeting resistance current source links to each other with current lens unit by the first switch element or the built-in resistor current source links to each other with current lens unit by the second switch unit, above-mentioned whole process realizes automatically, do not need special external control signal, thereby implementation is simple, has reduced production cost;
2) because the present invention has been applicable to outer meeting resistance and without two kinds of situations of outer meeting resistance, therefore can support that outer meeting resistance plugs arbitrarily, increased the dirigibility of its use;
3) because the present invention does not need special external control signal, when therefore selecting between outer meeting resistance current source and built-in resistor current source, speed is faster, and sensitivity is also higher.
Description of drawings
Fig. 1 is the circuit diagram of adaptive circuit control device in the prior art;
Fig. 2 is the structural representation of adaptive circuit control device provided by the invention;
Fig. 3 is the structural representation of switch control unit among Fig. 2;
Fig. 4 is the circuit diagram of the adaptive circuit control device that provides of first embodiment of the invention;
Fig. 5 is the circuit diagram of control port among Fig. 4;
Fig. 6 is the circuit diagram of the adaptive circuit control device that provides of second embodiment of the invention.
Embodiment
A lot of details have been set forth in the following description so that fully understand the present invention.But the present invention can implement much to be different from alternate manner described here, and those skilled in the art can do similar popularization in the situation of intension of the present invention, so the present invention is not subjected to the restriction of following public implementation.
Secondly, the present invention utilizes synoptic diagram to be described in detail, and when the embodiment of the invention was described in detail in detail, for ease of explanation, described synoptic diagram was example, and it should not limit the scope of protection of the invention at this.
Just as stated in the Background Art, comprise at the same time in the current automatic adaptation control device of outer meeting resistance current source and built-in resistor current source, prior art needs special external control signal to select outer meeting resistance current source or built-in resistor current source, so just greatly limit its practical dirigibility, and increased the realization cost.
The invention provides the current automatic adaptation control device whether a kind of energy automatic decision exists outer meeting resistance, increased judging unit, whether there is outer meeting resistance by judging unit, and then the information that obtains according to judging unit of switch control unit, realization is to the control of the first switch element and second switch unit, so that the outer meeting resistance current source links to each other with current lens unit by the first switch element or the built-in resistor current source links to each other with current lens unit by the second switch unit, above-mentioned whole process realizes automatically, do not need special external control signal, thereby implementation is simple, has reduced production cost.
Below in conjunction with accompanying drawing embodiments of the present invention are described in detail.
Referring to shown in Figure 2, adaptive circuit control device provided by the invention, comprise: outer meeting resistance current source 1, built-in resistor current source 2, judging unit 3, the first switch element 4, second switch unit 5, switch control unit 6, current lens unit 7 and output port 8, wherein:
Outer meeting resistance current source 1 is used for providing the electric current of the outer meeting resistance when having outer meeting resistance;
Built-in resistor current source 2 is used for providing the electric current of the built-in resistor when not having outer meeting resistance;
The first switch element 4, the one end connects outer meeting resistance current source 1, and the other end connects current lens unit 7;
Second switch unit 5, the one end connects built-in resistor current source 2, and the other end connects current lens unit 7;
Current lens unit 7, its input end connects the first switch element 4 and second switch unit 5, when 4 unlatchings of the first switch element, when second switch unit 5 is closed, the outer meeting resistance electric current that outer meeting resistance current source 1 is provided carries out mirror image, obtains the image current of outer meeting resistance electric current; When the first switch element 4 is closed, when second switch unit 5 is opened, the built-in resistor electric current that built-in resistor current source 2 is provided carries out mirror image, obtains the image current of built-in resistor electric current;
Wherein, referring to shown in Figure 3, described switch control unit 6 comprises: initialization unit 61, the first rejection gate 62, the second rejection gate 63, phase inverter 64, initial control end S1, judgement control end S2, Circumscribing port S3 and built-in control end S4, wherein: described initialization unit 61 connects the input end of initial control end S1, during initialization, described initialization unit 61 gives described initial control end S1 high level state; After the initialization, described initialization unit 61 gives described initial control end S1 low level; The output terminal of described initial control end connects the input end of the first rejection gate 62, the output terminal of the first rejection gate 62 connects built-in control end S4, the output terminal of described built-in control end S4 connects the input end of second switch unit 5, the second rejection gate 63 and phase inverter 64, and described built-in control end S4 is used for the On/Off of control second switch unit 5 and the state of Circumscribing port S3; The output terminal of described phase inverter 64 connects the input end of Circumscribing port S3, and the output terminal of Circumscribing port S3 connects the first switch element 4, and described Circumscribing port S3 is used for the On/Off of control the first switch element 4; The output terminal of the input end connection judgment unit 3 of described judgement control end S2, the output terminal of described judgement control end S2 connects the input end of the second rejection gate 63, and the output terminal of the second rejection gate 63 connects the input end of the first rejection gate 62.
Referring to shown in Figure 4, the circuit diagram of the current automatic adaptation control device that first embodiment of the invention provides comprises:
The outer meeting resistance current source 1 that the first operational amplifier A 1, NMOS pipe N1 and outer meeting resistance link form is used for providing the current source of the outer meeting resistance when having outer meeting resistance, wherein: the positive input input reference voltage V1 of the first operational amplifier A 1; The grid of the one NMOS pipe N1 connects the output terminal of the first operational amplifier A 1, and its source electrode connects the reverse input end of the first operational amplifier A 1, and its drain electrode is as the output terminal of outer meeting resistance current source; The outer meeting resistance link connects the reverse input end of the first operational amplifier A 1 and the source electrode of NMOS pipe N1, when having outer meeting resistance R, the electric current of described outer meeting resistance current source output terminal output is I1, described I1=V1/R, and wherein: R is the resistance of outer meeting resistance R;
The first current source I
B1, the built-in resistor current source 2 that forms of the 2nd NMOS pipe N2, the 3rd NMOS pipe N3 and the 4th NMOS pipe N4, be used for providing the current source of the built-in resistor when not having outer meeting resistance, wherein: the first current source I
B1Drain electrode, the grid of the 2nd NMOS pipe N2, the grid of the 3rd NMOS pipe N3 and the grid of the 4th NMOS pipe N4 of output terminal, the 2nd NMOS pipe N2 link to each other, the source ground of the source electrode of the source electrode of the 2nd NMOS pipe N2, the 3rd NMOS pipe N3 and the 4th NMOS pipe N4, the grid output current I of the 2nd NMOS pipe N2
B1, the drain electrode of described the 3rd NMOS pipe N3 is as the first output terminal of described built-in resistor current source 2, and the drain electrode of described the 4th NMOS pipe N4 is as the second output terminal of described built-in resistor current source 2;
The second current source I
B2, the judging unit 3 that forms of the 8th PMOS pipe P8, the second operational amplifier A 2 and the first capacitor C 1, be used for judging whether to exist outer meeting resistance, wherein: the second current source I
B2Output terminal connect the source electrode of the 8th PMOS pipe P8, the drain electrode of the 8th PMOS pipe P8, the reverse input end of the second operational amplifier A 2, an end of the first capacitor C 1 are connected with the outer meeting resistance link, the positive input input reference voltage V1 of the second operational amplifier A 2, the other end ground connection of the first capacitor C 1, the output terminal connection judgment control port S2 of the second operational amplifier A 2, the grid of the 8th PMOS pipe P8 connects built-in control end S4, R * I
B2＜V1, wherein: R is the resistance of outer meeting resistance R, I
B2The second current source I
B2The electric current that provides;
Above-mentioned the 8th PMOS pipe P8 is as the 3rd switch element, and in initialization procedure, described the 3rd switch element is in opening.
The first switch element 4 that the 4th PMOS pipe P4 and the 5th PMOS pipe P5 form, wherein: the grid of the 4th PMOS pipe P4 connects Circumscribing port mouth S3 with the grid of the 5th PMOS pipe P5, the output terminal of the drain electrode connection outer meeting resistance current source 1 of the drain electrode of the 4th PMOS pipe P4 and the 5th PMOS pipe P5, the i.e. drain electrode of the drain electrode of the 4th PMOS pipe P4 and the 5th PMOS pipe P5 connects the drain electrode of NMOS pipe N1, and the source electrode of the source electrode of the 4th PMOS pipe P4 and the 5th PMOS pipe P5 connects the input end of current lens unit 7;
The second switch unit 5 that the 6th PMOS pipe P6 and the 7th PMOS pipe P7 form, wherein: the grid of the 6th PMOS pipe P6 connects built-in control port S4 with the grid of the 7th PMOS pipe P7, the output terminal of the drain electrode connection built-in resistor current source 2 of the drain electrode of the 6th PMOS pipe P6 and the 7th PMOS pipe P7, the i.e. drain electrode of the drain electrode of the 6th PMOS pipe P6 and the 7th PMOS pipe P7 connects the drain electrode of the 3rd NMOS pipe N3, and the source electrode of the source electrode of the 6th PMOS pipe P6 and the 7th PMOS pipe P7 connects the input end of current lens unit 7;
The one PMOS manages P1, the current lens unit 7 that the 2nd PMOS pipe P2 and the 3rd PMOS pipe P3 form, wherein: the grid of PMOS pipe P1, the grid of the 2nd PMOS pipe P2, the grid of the 3rd PMOS pipe P3 connects with the drain electrode of PMOS pipe P1, the source electrode of the one PMOS pipe P1, the source electrode of the 2nd PMOS pipe P2 connects voltage source V CC with the source electrode of the 3rd PMOS pipe P3, the drain electrode of the 2nd PMOS pipe P2 is as the first output terminal of current lens unit 7, the drain electrode of the 3rd PMOS pipe P3 is as the second output terminal of current lens unit 7, the drain electrode of the 3rd PMOS pipe P3 connects the input end of output unit 8, the input end of current lens unit 7 connects the first switch element 4 and second switch unit 5, that is: the source electrode of the 4th PMOS pipe P4 connects the drain electrode that a PMOS manages P1 with the source electrode of the 6th PMOS pipe P6, the source electrode of the 5th PMOS pipe P5 connects the grid of the 3rd PMOS pipe P3, the grid of the grid of the 2nd PMOS pipe P2 and PMOS pipe P1, the source electrode of the 7th PMOS pipe P7 connects the grid of the 3rd PMOS pipe P3, the grid of the grid of the 2nd PMOS pipe P2 and PMOS pipe P1; When 4 unlatchings of the first switch element, when second switch unit 5 is closed, the outer meeting resistance electric current that 7 pairs of outer meeting resistance current sources 1 of current lens unit provide carries out mirror image, obtains the image current of outer meeting resistance electric current; When the first switch element 4 is closed, when second switch unit 5 is opened, the built-in resistor electric current that 7 pairs of built-in resistor currents of current lens unit source 2 provides carries out mirror image, obtains the image current of built-in resistor electric current;
The initialization unit 61 that Schmidt trigger ST and the second capacitor C 2 form, wherein: an end ground connection of the second electric capacity, the input end of the second output terminal of the other end of the second electric capacity, built-in resistor current source 2, the first output terminal of current lens unit 7 and Schmidt trigger ST links to each other, and the output terminal of Schmidt trigger ST connects initial control end S1;
Referring to shown in Figure 5, initialization unit 61, the first rejection gate Nor1, the second rejection gate Nor2, the first phase inverter Inv1, the second phase inverter Inv2, the 3rd phase inverter Inv3, the 4th phase inverter Inv4, the 5th phase inverter Inv5, initial control end S1, judge control end S2, the switch control unit 6 that Circumscribing port S3 and built-in control end S4 form, wherein: described initialization unit 61 connects the input end of initial control end S1, that is: the output terminal of described Schmidt trigger ST connects the input end of initial control end S1, during initialization, described initialization unit 61 gives described initial control end S1 high level state; After the initialization, described initialization unit 61 gives described initial control end S1 low level; The output terminal of described initial control end connects the input end of the first rejection gate Nor1, the output terminal of the first rejection gate Nor1 connects the input end of the first phase inverter Inv1, the output terminal of the first phase inverter Inv1 connects the input end of the second phase inverter Inv2, the output terminal of the second phase inverter Inv2 connects built-in control end S4, the output terminal of described built-in control end S4 connects the input end of second switch unit 5, the second rejection gate Nor2 and the 3rd phase inverter Inv3, and described built-in control end S4 is used for the On/Off of control second switch 5 and the state of Circumscribing port S3; The output terminal of described the 3rd phase inverter Inv3 connects the input end of Circumscribing port S3, and the output terminal of Circumscribing port S3 connects the first switch element 4, and described Circumscribing port S3 is used for the On/Off of control the first switch element; The output terminal of the input end connection judgment unit 3 of described judgement control end S2, the output terminal of described judgement control end S2 connects the input end of the second rejection gate Nor2, the output terminal of the second rejection gate Nor2 connects the input end of the 4th phase inverter Inv4, the output terminal of the 4th phase inverter Inv4 connects the input end of the 5th phase inverter Inv5, and the output terminal of the 5th phase inverter Inv5 connects the input end of the first rejection gate Nor1; The input end of described judging unit 3 connects built-in control end S2.
Wherein, described outer meeting resistance current source 1 is same as the prior art, and outer meeting resistance current source shown in Figure 4 is a kind of concrete embodiment, and it should not limit protection scope of the present invention.
Wherein, described built-in resistor current source 2 has two output terminals, because the 2nd NMOS pipe N2 and the 3rd NMOS pipe N3 form a current mirror, the 2nd NMOS pipe N2 and the 4th NMOS pipe N4 form a current mirror, therefore the electric current of the electric current of the 3rd NMOS pipe N3 drain electrode output and the 4th NMOS pipe N4 output is linear, that is: the electric current of the first output terminal of built-in resistor current source 2 and the second output terminal is linear.
Wherein, described current lens unit 7 has two output terminals, because PMOS pipe P1 and the 2nd PMOS pipe P2 form a current mirror, the 2nd PMOS pipe P2 and the 3rd PMOS pipe P3 form a current mirror, therefore the electric current of the drain electrode output of the electric current of the 2nd PMOS pipe P2 drain electrode output and the 3rd PMOS pipe P3 is linear, that is: the electric current of the first output terminal of current lens unit 7 and the second output terminal is linear.
Wherein, owing to comprise the second capacitor C 2 in the initialization unit 61, therefore electric current not in the second capacitor C 2 during initialization, be VC2=0, thereby the input terminal voltage of Schmidt trigger ST is " 0 " (low level), the output end voltage of Schmidt trigger ST is " 1 " (high level), and namely the state of initialization port S1 when initialization is high level.
Referring to shown in Figure 5, when the state of initialization port S1 is high level, the state of built-in control end S4 is low level, the state of Circumscribing port S3 is high level, at this moment, and the 4th PMOS pipe P4 and the 5th PMOS pipe P5 cut-off, the 6th PMOS pipe P6 and the 7th PMOS pipe P7 conducting, the 8th PMOS pipe P8 opens, and namely the first switch element 4 is closed, and second switch unit 5 is opened.When second switch unit 5 is opened, the first current source I
B1The electric current of output is divided into two-way, and one the tunnel after the current mirror that the 2nd NMOS pipe N2 and the 3rd NMOS pipe N3 form carries out mirror image, flows to the second capacitor C 2 again after the current mirror that PMOS pipe P1 and the 2nd PMOS pipe P2 form carries out mirror image; Another road directly flows to the second capacitor C 2 after the current mirror of the 2nd NMOS pipe N2 and the 4th NMOS pipe N4 composition carries out mirror image.For the voltage that the makes VC2 low level when initial transfers high level to, first via electric current can not equate fully with the second road electric current, i.e. I
B1* K
1* K
2≠ I
B1* K
3, can be reduced to: K
1* K
2≠ K
3, wherein: I
B1From the first current source I
B1The electric current of output, K
1The current mirror output current of the 2nd NMOS pipe N2 and the 3rd NMOS pipe N3 composition and the ratio of input current, K
2The current mirror output current of PMOS pipe P1 and the 2nd PMOS pipe P2 composition and the ratio of input current, K
3The current mirror output current of the 2nd NMOS pipe N2 and the 4th NMOS pipe N4 composition and the ratio of input current,
W
N3The channel width of the 3rd NMOS pipe N3, L
N3The channel length of the 3rd NMOS pipe N3, L
N2The channel length of the 2nd NMOS pipe N2, W
N2The channel width of the 2nd NMOS pipe N2, W
N4The channel width of the 4th NMOS pipe N4, L
N4The channel length of the 4th NMOS pipe N4, L
P1The channel length of PMOS pipe P1, W
P2The channel width of the 2nd PMOS pipe P2, L
P2The channel length of the 2nd PMOS pipe P2, W
P1The channel width of PMOS pipe P1, K
1* K
2≠ K
3Further be reduced to: W
N3* W
P2* L
P1* L
N4≠ W
N4* L
N3* L
P2* N
P1Satisfying W
N3* W
P2* L
P1* L
N4≠ W
N4* L
N3* L
P2* N
P1Condition under, after a period of time that the second capacitor C 2 is charged, the voltage of VC2 can raise from low level gradually and be high level, when the voltage of VC2 during greater than the forward threshold voltage of Schmidt trigger ST, the state of initial control end S1 will transfer " 0 " (low level) to from " 1 " (high level), finishes initialization procedure this moment.
K in the present embodiment
1=1, K
2=1, so W
N3* L
N4≠ W
N4* L
N3Need to prove that only for illustrating, it can not limit protection scope of the present invention at this.As: when the input end electric current of current lens unit 7 equated with the first output end current, described the 3rd NMOS pipe N3 and the 4th NMOS pipe N4 satisfied: W
N3* L
N4≠ W
N4* L
N3, wherein: W
N3The channel width of the 3rd NMOS pipe N3, L
N3The channel length of the 3rd NMOS pipe N3, L
N4The channel length of the 4th NMOS pipe N4, W
N4It is the channel width of the 4th NMOS pipe N4.
Present embodiment adopts Schmidt trigger ST, thereby in initialization procedure, guarantees that initial control end S1 is output as " 1 "; After initialization is finished, guarantee that initial control end S1 is output as " 0 ".The hysteresis effect of Schmidt trigger ST can guarantee can not shake during its output when judging relatively, has guaranteed that namely initial control end S1 can back and forth vibration between " 1 " and " 0 ".
In initialization procedure, the first switch element 4 is closed, and second switch unit 5 is opened, and the 8th PMOS pipe P8 opens, and the course of work of described judging unit 3 has two kinds of possibilities:
1) when having outer meeting resistance R, the magnitude of voltage VC1 of the first capacitor C 1 is: VC1=R * I
B2＜V1, wherein: R is the resistance of outer meeting resistance R, I
B2Be the second current source I
B2The electric current of output, namely the voltage of the second operational amplifier A 2 reverse input ends is VC1, this moment, the output terminal of the second operational amplifier A 2 was " 0 " (being low level), thus the state of judging control end S2 is " 1 " (being high level).
2) when not having outer meeting resistance R, the voltage of the first capacitor C 1 just is equivalent to by moving voltage source V CC on the 8th PMOS pipe P8 that is in conducting state, this moment, voltage and the VCC of the first capacitor C 1 were very approaching, that is: magnitude of voltage VC1 ' is: VC1 ' ≈ VCC＞V1, this moment, the output terminal of the second operational amplifier A 2 was " 1 " (being high level), thereby the state of judging control end S2 is " 0 " (being low level).
By above analysis as can be known, in initialization procedure, when the state of judging control end S2 is " 1 ", there is outer meeting resistance R; When the state of judging control end S2 is " 0 ", there is not outer meeting resistance R, namely judge by extracting in the initialization procedure state of control end S2 just can learn whether there is outer meeting resistance R.
After initialization is finished, the state of initial control end S1 is " 0 ", the state of judging control end S2 is " 1 (when having outer meeting resistance R) " or " 0 (when not having outer meeting resistance R) ", refer again to shown in Figure 5, when the state of initial control end S1 is " 0 ", when the state of judgement control end S2 also was " 1 (when having outer meeting resistance R) ", the state of Circumscribing port S3 was " 0 ", and the state of built-in control end S4 is " 1 "; When the state of initial control end S1 is " 0 ", the state of judging control end S2 is not during for " 0 (when existing outer meeting resistance R) ", and the state of Circumscribing port S3 is " 1 ", and the state of built-in control end S4 is " 0 ".
After the below discusses initialization respectively, there is resistance and do not have two kinds of different situations of resistance.
When there being outer meeting resistance R, that is: the state of initial control end S1 is " 0 ", the state of judging control end S2 is " 1 ", the state of Circumscribing port S3 is " 0 ", when the state of built-in control end S4 is " 1 ", the 4th PMOS pipe P4 and the 5th PMOS pipe P5 all open, and the 6th PMOS pipe P6 and the 7th PMOS pipe P7 all close, namely the first switch element 4 is opened, second switch unit 5 is closed, this moment, outer meeting resistance current source 1 was connected with the current lens unit 3 that the 3rd PMOS pipe P3 forms with PMOS pipe P1 by the first switch element, built-in resistor current source 2 is not connected with current lens unit 3, the electric current I 1 (being I1=V1/R) that is 3 pairs of outer meeting resistance current source outputs of current lens unit is carried out mirror image, last image current by 3 pairs of electric current I 1 of output unit 8 output current mirror units.
When there not being outer meeting resistance R, that is: the state of initial control end S1 is " 0 ", the state of judging control end S2 is " 0 ", the state of Circumscribing port S3 is " 1 ", when the state of built-in control end S4 is " 0 ", the 6th PMOS pipe P6 and the 7th PMOS pipe P7 all open, and the 4th PMOS pipe P4 and the 5th PMOS pipe are all closed, namely the first switch element 4 is closed, second switch unit 5 is opened, this moment, built-in resistor current source 2 was connected with the current lens unit 3 that the 3rd PMOS pipe P3 forms with PMOS pipe P1 by second switch unit 5, outer meeting resistance current source 1 is not connected with current lens unit 3, and namely 3 pairs of built-in resistor current source output terminal electric current I 2 of current lens unit (are worked as K
1=1 o'clock, I2=I
B1) carry out mirror image, at last by the image current of 3 pairs of electric current I 2 of output unit output current mirror unit.
Referring to shown in Figure 6, the circuit diagram of the current automatic adaptation control device that second embodiment of the invention provides, the difference of itself and the first embodiment is: the 8th PMOS pipe P8 is substituted by the 5th NMOS pipe N5, this moment by the 5th NMOS pipe N5 as the 3rd switch element; The grid of the 8th PMOS pipe P8 connects built-in control end S4 and is connected Circumscribing port S3 replacement by the grid of the 5th NMOS pipe N5, and in initialization procedure, described the 3rd switch element is in opening; Schmidt trigger ST is replaced by voltage comparator B, the second output terminal of the other end of the positive input of described comparer B, the second capacitor C 2, built-in resistor current source 2 links to each other respectively in twos with the first output terminal of current lens unit 7, the reverse input end input threshold voltage V2 of described comparer B.Voltage at the positive input of comparer B rises to the process of threshold voltage V2 from 0, threshold voltage V2 dividing potential drop from reference voltage V 1 obtains described in the deterministic process present embodiment that judging unit 3 is finished whether have outer meeting resistance, and the output terminal of described comparer B connects initial control end S1; All the other are identical with the first embodiment.Need to prove, in other embodiments of the invention, described threshold voltage V2 can also be directly from voltage source V CC dividing potential drop realize or adopt other modes to realize, should not limit protection scope of the present invention at this.
When the second embodiment initialization, voltage VC2 is less than the threshold voltage V2 of voltage comparator B, and the state of initial control end S1 is " 1 ", the state of Circumscribing port S3 is " 0 ", thereby the 5th NMOS pipe N5 conducting, judge that when there being outer meeting resistance R the state of control end S2 is " 1 " this moment; When not having outer meeting resistance R, judge that the state of control end S2 is " 0 ".When the voltage of voltage VC2 during greater than the threshold voltage V2 of voltage comparator B, the state of initial control end S1 is " 0 ", thereby finishes initialization procedure.After finishing initialization procedure, remaining course of work of the second embodiment is identical with the first embodiment, does not repeat them here.
In above-mentioned two embodiment, increased judging unit, whether there is outer meeting resistance by judging unit, and then the information that obtains according to judging unit of switch control unit, realization is to the control of the first switch element and second switch unit, so that the outer meeting resistance current source links to each other with current lens unit by the first switch element or the built-in resistor current source links to each other with current lens unit by the second switch unit, above-mentioned whole process realizes automatically, do not need special external control signal, thereby implementation is simple, has reduced production cost; Because the embodiment of the invention has been applicable to outer meeting resistance and without two kinds of situations of outer meeting resistance, therefore can support that outer meeting resistance plugs arbitrarily, has increased the dirigibility of its use; Owing to do not need special external control signal, when therefore selecting between outer meeting resistance current source and built-in resistor current source, speed is faster, and sensitivity is also higher.
The above; it only is preferred embodiment of the present invention; be not that the present invention is done any pro forma restriction, any simple modification, equivalent variations and modification that every foundation technical spirit of the present invention is done above embodiment all still belong to the protection domain of technical solution of the present invention.
Claims (13)
1. a current automatic adaptation control device is characterized in that, comprising:
The outer meeting resistance current source is used for providing the electric current of the outer meeting resistance when having outer meeting resistance;
The built-in resistor current source is used for providing the electric current of the built-in resistor when not having outer meeting resistance, comprises two output terminals;
Judging unit, its input end connects the outer meeting resistance current source and receives reference voltage, be used for judging whether to exist outer meeting resistance, when the voltage of described outer meeting resistance current source and described judging unit tie point during less than described reference voltage, there is outer meeting resistance in judgement; When the voltage of described outer meeting resistance current source and described judging unit tie point during greater than described reference voltage, judge not have outer meeting resistance;
The first switch element, the one end connects the outer meeting resistance current source, and the other end connects current lens unit;
The second switch unit, the one end connects the first output terminal of built-in resistor current source, and the other end connects current lens unit;
Current lens unit, its input end connects the first switch element and second switch unit, when the unlatching of the first switch element, when the second switch unit is closed, the outer meeting resistance electric current that the outer meeting resistance current source is provided carries out mirror image, obtains the image current of outer meeting resistance electric current; When the first switch element is closed, when the second switch unit is opened, the built-in resistor electric current that built-in resistor current source is provided carries out mirror image, obtains the image current of built-in resistor electric current; Described current lens unit comprises two output terminals;
Switch control unit, the first output terminal of the output terminal of its input end connection judgment unit, the second output terminal of built-in resistor current source and current lens unit, the electric current of the electric current of the first output terminal of described current lens unit and described built-in resistor current source the second output terminal is unequal, the output terminal of described switch control unit connects the first switch element and second switch unit, the On/Off that is used for control the first switch element and second switch unit, when there is outer meeting resistance in judgment unit judges, the first switch element is opened, and the second switch unit is closed; When there is not outer meeting resistance in judgment unit judges, the second switch unit is opened, the first switch element is closed;
Output unit, the second output terminal of connection current lens unit is used for the image current of output outer meeting resistance electric current or the image current of built-in resistor electric current.
2. current automatic adaptation control device according to claim 1, it is characterized in that, described switch control unit comprises: initialization unit, the first rejection gate, the second rejection gate, phase inverter, initial control end, judgement control end, Circumscribing port and built-in control end, wherein: described initialization unit connects the input end of initial control end, during initialization, described initialization unit gives described initial control end high level state; After the initialization, described initialization unit gives described initial control end low level; The output terminal of described initial control end connects the input end of the first rejection gate, the output terminal of the first rejection gate connects built-in control end, the output terminal of described built-in control end connects the input end of second switch unit, the second rejection gate and phase inverter, and described built-in control end is used for the On/Off of control second switch and the state of Circumscribing port; The output terminal of described phase inverter connects the input end of Circumscribing port, and the output terminal of Circumscribing port connects the first switch element, and described Circumscribing port is used for the On/Off of control the first switch element; The output terminal of the input end connection judgment unit of described judgement control end, the output terminal of described judgement control end connects the input end of the second rejection gate, and the output terminal of the second rejection gate connects the input end of the first rejection gate.
3. current automatic adaptation control device according to claim 1, it is characterized in that, described outer meeting resistance current source comprises: the first operational amplifier, NMOS pipe and outer meeting resistance link, wherein: the positive input input reference voltage of the first operational amplifier; The grid of the one NMOS pipe connects the output terminal of the first operational amplifier, and its source electrode connects the reverse input end of the first operational amplifier, and its drain electrode is as the output terminal of outer meeting resistance current source; The outer meeting resistance link connects the reverse input end of the first operational amplifier and the source electrode of a NMOS pipe.
4. current automatic adaptation control device according to claim 1, it is characterized in that, described built-in resistor current source comprises: the first current source, the 2nd NMOS pipe, the 3rd NMOS pipe and the 4th NMOS pipe, wherein: the output terminal of the first current source, the drain electrode of the 2nd NMOS pipe, the grid of the 2nd NMOS pipe, the grid of the 3rd NMOS pipe links to each other with the grid of the 4th NMOS pipe, the source electrode of the 2nd NMOS pipe, the source ground of the source electrode of the 3rd NMOS pipe and the 4th NMOS pipe, the drain electrode of described the 3rd NMOS pipe is as the first output terminal of described built-in resistor current source, and the drain electrode of described the 4th NMOS pipe N4 is as the second output terminal of described built-in resistor current source.
5. current automatic adaptation control device according to claim 4 is characterized in that, when the input current of described current lens unit equated with the electric current of its first output terminal, described the 3rd NMOS pipe and the 4th NMOS pipe satisfied following relation: W
N3* L
N4≠ W
N4* L
N3, wherein: W
N3The channel width of the 3rd NMOS pipe, L
N3The channel length of the 3rd NMOS pipe, L
N4The channel length of the 4th NMOS pipe, W
N4It is the channel width of the 4th NMOS pipe.
6. current automatic adaptation control device according to claim 2, it is characterized in that, described judging unit comprises: the second current source, the 3rd switch element, the second operational amplifier and the first electric capacity, wherein: the output terminal of the second current source connects the 3rd switch element, the 3rd switch element, the reverse input end of the second operational amplifier, one end of the first electric capacity links to each other with the outer meeting resistance current source, the positive input input reference voltage of the second operational amplifier, the other end ground connection of the first electric capacity, the output terminal connection judgment control port of the second operational amplifier, during described switch control unit initialization, described the 3rd switch element is opened, and satisfies
Wherein: R is the resistance of outer meeting resistance, I
B2Be the electric current that the second current source provides, V1 is reference voltage.
7. current automatic adaptation control device according to claim 6, it is characterized in that, described the 3rd switch element comprises the 8th PMOS pipe, the source electrode of described the 8th PMOS pipe connects the output terminal of described the second current source, one end of the reverse input end of the drain electrode of described the 8th PMOS pipe, the second operational amplifier, the first electric capacity links to each other with the outer meeting resistance current source, and the grid of described the 8th PMOS pipe connects built-in control end.
8. current automatic adaptation control device according to claim 6, it is characterized in that, described the 3rd switch element comprises the 5th NMOS pipe, the drain electrode of described the 5th NMOS pipe connects the output terminal of described the second current source, one end of the reverse input end of the source electrode of described the 5th NMOS pipe, the second operational amplifier, the first electric capacity links to each other with the outer meeting resistance current source, and the grid of described the 5th NMOS pipe connects Circumscribing port.
9. current automatic adaptation control device according to claim 2, it is characterized in that, described the first switch element comprises: the 4th PMOS pipe and the 5th PMOS pipe, wherein: the grid of the grid of the 4th PMOS pipe and the 5th PMOS pipe connects the Circumscribing port mouth, the drain electrode of the drain electrode of the 4th PMOS pipe and the 5th PMOS pipe connects the output terminal of outer meeting resistance current source, and the source electrode of the source electrode of the 4th PMOS pipe and the 5th PMOS pipe connects the input end of current lens unit.
10. current automatic adaptation control device according to claim 2, it is characterized in that, described second switch unit comprises: the 6th PMOS pipe and the 7th PMOS pipe, wherein: the grid of the grid of the 6th PMOS pipe and the 7th PMOS pipe connects built-in control port, the drain electrode of the drain electrode of the 6th PMOS pipe and the 7th PMOS pipe connects the first output terminal of built-in resistor current source, and the source electrode of the source electrode of the 6th PMOS pipe and the 7th PMOS pipe connects the input end of current lens unit.
11. current automatic adaptation control device according to claim 2, it is characterized in that, described initialization unit comprises: Schmidt trigger and the second electric capacity, wherein: an end ground connection of the second electric capacity, the input end of the second output terminal of the other end of the second electric capacity, built-in resistor current source, the first output terminal of current lens unit and Schmidt trigger links to each other, and the output terminal of described Schmidt trigger connects initial control end.
12. current automatic adaptation control device according to claim 2, it is characterized in that, described initialization unit comprises: comparer and the second electric capacity, wherein: an end ground connection of the second electric capacity, the other end of the second electric capacity, the second output terminal of built-in resistor current source, the first output terminal of current lens unit and the positive input of comparer link to each other, the output terminal of described comparer connects initial control end, the reverse input end input threshold voltage of described comparer, when the voltage of described comparer positive input during less than described threshold voltage, the state of described initial control end is high level; When the voltage of described comparer positive input during greater than described threshold voltage, the state of described initial control end is low level.
13. current automatic adaptation control device according to claim 1, it is characterized in that, described current lens unit comprises: PMOS pipe, the 2nd PMOS pipe and the 3rd PMOS pipe, wherein: the grid of a PMOS pipe, the grid of the grid of the 2nd PMOS pipe and the 3rd PMOS pipe connects, the source electrode of the one PMOS pipe, the source electrode of the source electrode of the 2nd PMOS pipe and the 3rd PMOS pipe connects voltage source, the drain electrode of the 2nd PMOS pipe is as the first output terminal of current lens unit, the drain electrode of the 3rd PMOS pipe is as the second output terminal of current lens unit, the drain electrode of the 3rd PMOS pipe connects the input end of output unit, and the drain electrode of a PMOS pipe is as the input end of current lens unit.
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| CN105846812B (en) * | 2016-05-27 | 2019-02-15 | 南京德睿智芯电子科技有限公司 | A kind of electric current automatic switch-over circuit and its implementation |
| CN107272802B (en) * | 2017-06-27 | 2019-02-12 | 苏州佳世达光电有限公司 | Electronic device |
| CN112383222A (en) * | 2020-11-11 | 2021-02-19 | 苏州坤元微电子有限公司 | Level conversion module |
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| US7301316B1 (en) * | 2005-08-12 | 2007-11-27 | Altera Corporation | Stable DC current source with common-source output stage |
| CN101630170A (en) * | 2009-08-18 | 2010-01-20 | 上海艾为电子技术有限公司 | Adaptive control device internally and externally set with constant current and method thereof |
| JP2011065208A (en) * | 2009-09-15 | 2011-03-31 | Ricoh Co Ltd | Constant current generation circuit, semiconductor device using the same, and electronic equipment |
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| US7301316B1 (en) * | 2005-08-12 | 2007-11-27 | Altera Corporation | Stable DC current source with common-source output stage |
| CN101630170A (en) * | 2009-08-18 | 2010-01-20 | 上海艾为电子技术有限公司 | Adaptive control device internally and externally set with constant current and method thereof |
| JP2011065208A (en) * | 2009-09-15 | 2011-03-31 | Ricoh Co Ltd | Constant current generation circuit, semiconductor device using the same, and electronic equipment |
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