CN103795397A - Level shifter and operational amplifier - Google Patents
Level shifter and operational amplifier Download PDFInfo
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- CN103795397A CN103795397A CN201210427437.4A CN201210427437A CN103795397A CN 103795397 A CN103795397 A CN 103795397A CN 201210427437 A CN201210427437 A CN 201210427437A CN 103795397 A CN103795397 A CN 103795397A
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Abstract
The invention relates to a level shifter comprising a signal receiving module, a potential adjusting module, and a switch module. According to an input signal, the signal receiving module is in an on state or off state. The potential adjusting module generates an adjusted output signal according to the input signal and comprises a first connection end and a second connection end, wherein the second connection end is coupled to the signal receiving module. The switch module comprises a first end coupled to the first connection end and a second end coupled to the second connection end. When the switch module is in an on state, a current path is formed among the first connection end, the second connection end, and the signal receiving module via the switch module. When the switch module is in an off state, the current cannot flow from the first connection end to the second connection end.
Description
Technical field
The present invention has about a kind of electric potential transducer (level shifter) and operational amplifier, is particularly to have the electric potential transducer and the operational amplifier that make its interior switch element can close and increase fast electric current.
Background technology
In known circuit, can adjust with an electric potential transducer current potential of signal, make follow-up element can have normal performance.For instance, use the digit element of numerical digit signal to need signal in the time that 1.2V is above, could correctly judge the logical value of signal, but the current potential of signal itself may only have 250mv, the potential value that therefore needs electric potential transducer to adjust signal makes the digit element can normal operation.
Fig. 1 has illustrated the electric potential transducer 100 of known technology.Electric potential transducer 100 has comprised a current potential adjusting module 101 and a signal receiving module 103.Signal receiving module 103 is in order to receive a differential input signal, and this differential input signal is by the first input signal V
in+and the second input signal V
in-institute forms.And current potential adjusting module 101 produces and adjusts rear output signal V according to this differential input signal
o.Current potential adjusting module 101 has a first transistor Tr
1an and transistor seconds Tr
2, the first transistor Tr
1control end T
cTr1, transistor seconds Tr
2control end T
cTr2and the second end T
2Tr2jointly be coupled to a tie point T.Signal receiving module 103 comprises one first switch SW
1an and second switch SW
2, the first switch SW
1control end T
cSW1and second switch SW
2control end T
cSW2receive respectively first, second input signal V
in+and V
in-, and the first switch SW
1with second switch SW
2conducting whether be by first, second input signal V
in+and V
in-control respectively.
But, under such circuit structure, transistor seconds Tr
2state in conducting always, has electric current and flows through always.Fig. 2 has illustrated the current situation schematic diagram of the electric potential transducer of known technology, and wherein transverse axis represents the time, and the first transistor Tr is flow through in longitudinal axis representative
1or transistor seconds Tr
2the current value of electric current I.As shown in Figure 2, the current curve C that dotted line indicates
irepresent the current value of the electric current I under ideal state, and the current curve C that solid line indicates
rrepresent the current value of the electric current I under actual state.Under ideal state, what electric current I can be very fast rises to predetermined current value I
w, and very fast drop to zero.But, in the time of actual state, transistor seconds Tr
2cannot receive fast earth potential, therefore tie point T also cannot drop to earth potential fast, Current rise and decrease speed meeting thereby compared with slow and have a delay phenomenon.In addition the first transistor T,
r1 when conducting, still has less electric current I
rcontinuous-flow is crossed transistor seconds Tr
2.Because Current rise and decrease speed are slow and have fixed current Continuous-flow to cross transistor seconds Tr
2, therefore in the unit interval, flow through the first transistor Tr
1or transistor seconds Tr
2electric current summation large (area that Fig. 2 bend indicates).As person familiar with the technology knows, element power consumption can be relevant with the electric current summation that flows through element, and therefore under the circuit structure of Fig. 1, current potential adjusting module 101 has larger power consumption.And under this kind of circuit structure, the delay phenomenon of Current rise and decline also can reduce the general performance of circuit.
Summary of the invention
Therefore, an object of the present invention is for providing a kind of electric potential transducer that can make switch element in it close and increase fast electric current.
Another object of the present invention is for providing a kind of operational amplifier that can make switch element in it close and increase fast electric current.
One embodiment of the invention have disclosed a kind of electric potential transducer, in order to produce output signal after an adjustment, comprise: a signal receiving module, there is at least one signal input part to receive at least one input signal, and according to this input signal conducting or not conducting; One current potential adjusting module, produces output signal after this adjustment according to this input signal, and this current potential adjusting module comprises one first link and one second link, and wherein this second link couples this signal receiving module; An and switch module, have that a first end couples this first link and one second end couples this second link, in the time of this switch module conducting, one current path sees through this switch module and is formed between this first link and this second link and this signal receiving module, in the time of this not conducting of switch module, an electric current cannot flow to this second link from this first link.
The structure of previous embodiment is not limited to use at electric potential transducer, also can use at operational amplifier.
According to aforesaid embodiment, the transistor coupling with switch module in current potential adjusting module can be closed, and the electric current that provides of current potential adjusting module can fast rise, can improve the problem in known technology.
Accompanying drawing explanation
Fig. 1 has illustrated the electric potential transducer of known technology.
Fig. 2 has illustrated the current situation schematic diagram of the electric potential transducer of known technology.
Fig. 3 has illustrated the schematic diagram according to electric potential transducer of the present invention.
Fig. 4 has illustrated according to the wherein schematic diagram of an example of electric potential transducer detailed construction of the present invention.
Fig. 5 has illustrated the current situation schematic diagram according to electric potential transducer of the present invention.
Main element symbol description
100,300 electric potential transducers
101,301 current potential adjusting modules
103,303 signal receiving modules
305 switch modules
T tie point
Tr
1the first transistor
Tr
2transistor seconds
SW
1the first switch element
SW
2second switch element
SW
3the 3rd switch element
T
1Tr1, T
1Tr2, T
1SW1, T
1SW2, T
1SW3, T
sm1first end
T
2Tr1, T
2Tr2, T
2SW1, T
2SW2, T
2SW3, T
sm2the second end
T
cTr1, T
cTr2, T
cSW1, T
cSW2, T
cSW3, T
smCcontrol end
T
s1, T
s2signal input part
T
adj1the first link
T
adj2the second link
Embodiment
Fig. 3 has illustrated according to the schematic diagram of electric potential transducer 300 of the present invention.Explain of the present invention content with the circuit structure shown in Fig. 1 as example though please be careful Fig. 3 content, not limited.The disclosed concept of the present invention is when being used on other circuit structures.For instance, what in Fig. 3, signal receiving module 303 received is a differential wave, but also can be single input signal.In addition, although the circuit in Fig. 3 and Fig. 4 is called as electric potential transducer, it also can use as other purposes, for instance, and can be as an operational amplifier.
As shown in Figure 3, electric potential transducer 300 has comprised a current potential adjusting module 301, a signal receiving module 303 and a switch module 305.Signal receiving module 303 has two signal input part T
s1, T
s2to receive respectively first, second input signal V
in+, V
in-, and signal receiving module 303 is according to first, second input signal V
in+, V
in-the conducting of logic level or not conducting.Current potential adjusting module 301 is according to first, second input signal V
in+, V
in-produce and adjust rear output signal V
o, and comprise one first link T
adj1and one second link T
adj2, wherein the first link T
adj1 couple switch module 305, the second link T
adj2couple signal receiving module 303.Switch module 305 has a first end T
sm1couple the first link T
adj1and one second end T
sm2couple the second link T
adj2.In the time of switch module 305 conducting, a current path sees through switch module 305 and is formed at the first link T
adj1and the second link T
adj2between.That is when switch module 305 conducting, an electric current can be from the first link T
adj1flow through switch module 305, the second link T then flows through
adj2arrive again signal receiving module 303.
In one embodiment, signal receiving module 303 comprises: a first signal input T
s1in order to receive the first input signal V
in+, and a secondary signal input T
s2in order to receive the second input signal V
in-.In addition, signal receiving module 303 also comprises one first switch element SW
1an and second switch element SW
2.The first switch element SW
1there is a control end T
cSW1as first signal input TS
1, and there is a first end T
1SW1couple current potential adjusting module 301, and there is one second end T
2SW1be coupled to one first current potential (being earth potential in this example).Second switch element SW
2there is a control end T
cSW2as secondary signal input T
s2, and there is a first end T
1SW2couple the second link T
adj2and the second end T of switch module 305
sm2, and there is one second end T
2SW2be coupled to the first current potential.As second switch element SW
2when conducting, switch module 305 not conductings, otherwise as second switch element SW
2when not conducting, switch module 305 conductings.In this embodiment, the control end T of switch module 305
smcalso receive the second input signal V
in-and according to the second input signal V
in-come conducting or not conducting.But switch module 305 also can be by being different from the second input signal V
in-signal control.
Current potential adjusting module 301 comprises a first transistor Tr
1an and transistor seconds Tr
2.The first transistor Tr
1comprise and couple the second link T
adj2a control end T
cTr1, be coupled to one second current potential V
cca first end T
1Tr1, and couple the first switch element SW
1first end T
1SW1one second end T
2Tr1.Transistor seconds Tr
2comprise and couple the second link T
adj2a control end T
cTr2, be coupled to the second current potential V
cca first end T
1Tr2, and couple the first link T
adj1one second end T
2Tr2.
Refer to Fig. 4, it has illustrated according to the wherein schematic diagram of an example of electric potential transducer detailed construction of the present invention.In Fig. 4, be to use one the 3rd transistor SW
3come as the switch module 305 in Fig. 3, can comprise the 3rd transistor SW but please be careful switch module 305
3outside other elements, also can be realized by other elements, as long as can reach identical function.The 3rd switch element SW
3first end T
1SW3for the first end T of the switch module 305 of Fig. 3
sm1, and the 3rd switch element SW
3the second end T
2SW3for the second end T of the switch module 305 of Fig. 3
sm2, its control end T
cSW3the control end T of the switch module 305 of Fig. 3
smc, it couples second switch element SW
2control end T
cSW2to receive the second input signal V
in-.
In the embodiment of Fig. 4, the first switch element SW
1and second switch element SW
2for N-type MOS (metal-oxide-semiconductor) transistor, and the first transistor Tr
1, transistor seconds Tr
2and the 3rd switch element SW
3for P type MOS (metal-oxide-semiconductor) transistor.Therefore as second switch element SW
2conducting (the second input signal V
in-for high potential), the 3rd switch element SW
3for not conducting.In in the case, what the current potential of tie point T can be very fast drop to earth potential makes to flow through the first transistor Tr
1electric current fast rise, and transistor seconds Tr
2not conducting.Otherwise, as second switch element SW
2not conducting (the second input signal V
in-for electronegative potential), the 3rd switch element SW
3for conducting.Now have a current path and be formed at the first link T
adj1and the second link T
adj2between, now, according to the state of the first input signal Vin+, can determine whether to have electric current from the first transistor Tr
1output.
Fig. 5 has illustrated the current situation schematic diagram according to electric potential transducer of the present invention.As shown in Figure 5, flow through the first transistor Tr
1electric current I can rise fast and provide large electric current with more efficient, make circuit have good general performance.In addition transistor seconds Tr,
2can be closed and not conducting, therefore not have transistor seconds Tr in known technology
2the problem that always always has electric current to flow through in conducting state.The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (10)
1. an electric potential transducer, in order to produce output signal after an adjustment, comprises:
One signal receiving module, has at least one signal input part to receive at least one input signal, and according to this input signal conducting or not conducting;
One current potential adjusting module, produces output signal after this adjustment according to this input signal, and this current potential adjusting module comprises one first link and one second link, and wherein this second link couples this signal receiving module; And
One switch module, have that a first end couples this first link and one second end couples this second link, in the time of this switch module conducting, one current path sees through this switch module and is formed at this first link, between this second link and this signal receiving module, in the time of this not conducting of switch module, intercept electric current and flow to this second link from this first link.
2. electric potential transducer as claimed in claim 1, is characterized in that, this signal receiving module comprises:
One first signal input, receives one first input signal;
One secondary signal input, receives one second input signal;
One first switch element, has a control end as this first signal input, and has a first end and couple this current potential adjusting module, and has one second end and be coupled to one first current potential; And
One second switch element, has a control end as this secondary signal input, and has a first end and couple this second end of this second link and this switch module, and has one second end and be coupled to this first current potential;
Wherein in the time of this second switch element conductive, this not conducting of switch module, and in the time of this not conducting of second switch element, this switch module conducting.
3. electric potential transducer as claimed in claim 2, is characterized in that, this current potential adjusting module comprises:
One the first transistor, comprises a control end that couples this second link, is coupled to a first end of one second current potential, and couples one second end of this first end of this first switch element; And
One transistor seconds, comprises a control end that couples this second link, is coupled to a first end of this second current potential, and couples one second end of this first link.
4. electric potential transducer as claimed in claim 3, is characterized in that, this switch module comprises:
One the 3rd switch element, comprises the first end as this first end of this switch module, as one second end of this second end of this switch module, and couples a control end of this control end of this second switch element.
5. electric potential transducer as claimed in claim 4, it is characterized in that, this first switch element, this second switch element and the 3rd switch element are N-type MOS (metal-oxide-semiconductor) transistor, and this first transistor and this transistor seconds are P type MOS (metal-oxide-semiconductor) transistor.
6. an operational amplifier, in order to produce output signal after an adjustment, comprises:
One signal receiving module, has at least one signal input part to receive at least one input signal, and according to this input signal conducting or not conducting;
One current potential adjusting module, produces output signal after this adjustment according to this input signal, and this current potential adjusting module comprises one first link and one second link, and wherein this second link couples this signal receiving module; And
One switch module, have that a first end couples this first link and one second end couples this second link, in the time of this switch module conducting, one current path sees through this switch module and is formed between this first link, this second link and this signal receiving module, in the time of this not conducting of switch module, intercept electric current and flow to this second link from this first link.
7. operational amplifier as claimed in claim 6, is characterized in that, this signal receiving module comprises:
One first signal input, receives one first input signal;
One secondary signal input, receives one second input signal;
One first switch element, has a control end as this first signal input, and has a first end and couple this current potential adjusting module, and has one second end and be coupled to one first current potential; And
One second switch element, has a control end as this secondary signal input, and has a first end and couple this second end of this second link and this switch module, and has one second end and be coupled to this first current potential;
Wherein in the time of this second switch element conductive, this not conducting of switch module, and in the time of this not conducting of second switch element, this switch module conducting.
8. operational amplifier as claimed in claim 7, is characterized in that, this current potential adjusting module comprises:
One the first transistor, comprises a control end that couples this second link, is coupled to a first end of one second current potential, and couples one second end of this first end of this first switch element; And
One transistor seconds, comprises a control end that couples this second link, is coupled to a first end of this second current potential, and couples one second end of this first link.
9. operational amplifier as claimed in claim 8, is characterized in that, this switch module comprises:
One the 3rd switch element, comprises the first end as this first end of this switch module, as one second end of this second end of this switch module, and couples a control end of this control end of this second switch element.
10. operational amplifier as claimed in claim 9, it is characterized in that, this first switch element, this second switch element and the 3rd switch element are N-type MOS (metal-oxide-semiconductor) transistor, and this first transistor and this transistor seconds are P type MOS (metal-oxide-semiconductor) transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210427437.4A CN103795397A (en) | 2012-10-31 | 2012-10-31 | Level shifter and operational amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210427437.4A CN103795397A (en) | 2012-10-31 | 2012-10-31 | Level shifter and operational amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103795397A true CN103795397A (en) | 2014-05-14 |
Family
ID=50670763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210427437.4A Pending CN103795397A (en) | 2012-10-31 | 2012-10-31 | Level shifter and operational amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103795397A (en) |
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Application publication date: 20140514 |
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