CN101309070B - Operational amplifier and dynamic current supply circuit - Google Patents
Operational amplifier and dynamic current supply circuit Download PDFInfo
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- CN101309070B CN101309070B CN2007101025665A CN200710102566A CN101309070B CN 101309070 B CN101309070 B CN 101309070B CN 2007101025665 A CN2007101025665 A CN 2007101025665A CN 200710102566 A CN200710102566 A CN 200710102566A CN 101309070 B CN101309070 B CN 101309070B
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Abstract
Disclosed are an operational amplifier and the dynamic current supplying circuit thereof. The dynamic current supplying circuit of the invention can be applied in the present operational amplifier. Two transistors are used; when the state of the input signals received respectively by a first input terminal and a second input terminal of the operational amplifier changes (namely, the operational amplifier is at transient state), the two transistors can be synchronously or asynchronously conducted through; thereby making the bias current of the first input terminal or/and the second input terminal of the operational amplifier to be added with a dynamic current. Thus, the dynamic current supplying circuit provided by the invention not only can increase the internal slew rate of the operational amplifier, but also makes the power consumption not increased when the operational amplifier is at steady state.
Description
Technical field
The present invention relates to a kind of operational amplifier, particularly a kind of dynamic current supply circuit that can promote the inner revolution rate of operational amplifier.
Background technology
General analog circuit mostly is greatly and adopts voltage mode (voltage mode) to come processing signals, and voltage-type operational amplifier (Operat ion Amplifier, OP Amp) because of low price and consistent, institute is so that operational amplifier extensively is subjected to general circuit design person to like using.Yet being subject to its gain frequency band long-pending (GBP) with voltage-type operational amplifier Chang Yin now is definite value, and its instantaneous velocity of reaction is not high enough, so can cause circuit designers to be restricted often at the Design Treatment high-frequency signal.So in order to make circuit designers not be restricted when the Design Treatment high-frequency signal, circuit designers can adopt the mode that promotes the inner revolution rate of operational amplifier (internal slew rate) to improve this type of problem usually.
And well known be that the inner revolution rate of operational amplifier is the bias current (I by the operational amplifier input stage
B) and its internal compensation electric capacity (C
M) ratio (I
B/ C
M) determined.So traditional operational amplifier is if when desire promotes its inner revolution rate under the fixing situation of portion's building-out capacitor within it, then must increase the bias current of operational amplifier input stage, but so will cause the utmost point zero point and the long-pending position change of gain frequency band of operational amplifier, and then cause the stability of operational amplifier to descend.In addition, the design concept that the input stage bias current that increases operational amplifier is not restricted when improving the Design Treatment high-frequency signal, the power consumption with more can cause operational amplifier to be in stable state the time becomes big.
Summary of the invention
In view of this, purpose of the present invention just provides a kind of dynamic current supply circuit, it is by utilizing two transistors, with when the input signal generation transition that is received out of the ordinary of the first input end of operational amplifier and second input, cause the first input end of operational amplifier or the bias current of second input to increase a dynamic current, so to reach the inner revolution rate of operational amplifier that promotes.
Another object of the present invention just provides a kind of operational amplifier, it is by the dynamic current supply circuit that the invention described above provided is used in wherein, so not only can reach and allow the transient response of operational amplifier accelerate to handle the more signal of high frequency, and because when the input signal generation transition that receives out of the ordinary of the first input end of operational amplifier and second input (that is operational amplifier is in instantaneous), the bias current of the first input end of operational amplifier or second input just can be out of the ordinary/increase a dynamic current simultaneously, so the power consumption when operational amplifier is in stable state can't increase.
Based on above-mentioned and other purpose, the invention provides a kind of dynamic current supply circuit, be applicable in the operational amplifier, wherein, the output signal that the output of the first input end of operational amplifier and second input input signal that receives out of the ordinary and operational amplifier is exported has the first common mode current potential and the second common mode current potential, and this dynamic current supply circuit comprises the first transistor and transistor seconds.Wherein, the output signal that the grid of the first transistor is exported in order to the output that receives operational amplifier, the drain electrode of the first transistor are in order to receive the first above-mentioned common mode current potential, and the source electrode of the first transistor is then in order to receive first dynamic current.The output signal that the grid of transistor seconds is exported in order to the output that receives operational amplifier, the drain electrode of transistor seconds are in order to receive the second above-mentioned common mode current potential, and the source electrode of transistor seconds is then in order to receive second dynamic current.
In one embodiment of this invention, when first transition takes place in the first input end of operational amplifier and second input input signal that receives out of the ordinary, the first transistor meeting conducting, and transistor seconds can end, so the bias current with the first input end that causes operational amplifier increases by the first above-mentioned dynamic current, and when second transition takes place in the first input end of operational amplifier and second input input signal that receives out of the ordinary, the first transistor can end, and transistor seconds can conducting, and so the bias current with second input that causes operational amplifier increases by the second above-mentioned dynamic current.When the first input end of operational amplifier and second input input signal that receives out of the ordinary are in stable state, the first transistor and transistor seconds end simultaneously, are not subjected to first dynamic current and second dynamic current and increase with the first input end that causes operational amplifier and each other bias current of second input.
From another viewpoint, the invention provides a kind of dynamic current supply circuit, be applicable in the operational amplifier, wherein, the output signal that the output of the first input end of operational amplifier and second input input signal that receives out of the ordinary and operational amplifier is exported has the first common mode current potential and the second common mode current potential, and this dynamic current supply circuit comprises the first transistor and transistor seconds.Wherein, in order to receive the first above-mentioned common mode current potential, the source electrode of the first transistor is then in order to receive first dynamic current in order to the drain electrode that receives the second above-mentioned common mode current potential, the first transistor for the grid of the first transistor.In order to receive the second above-mentioned common mode current potential, the source electrode of transistor seconds is then in order to receive second dynamic current in order to the drain electrode that receives the first above-mentioned common mode current potential, transistor seconds for the grid of transistor seconds.
In one embodiment of this invention, when first transition and second transition take place in the first input end of operational amplifier and second input input signal that receives out of the ordinary, the first transistor and transistor seconds all can conductings, as distinctly increasing by first dynamic current and second dynamic current with the first input end that causes operational amplifier and the bias current of second input.When first input end and second input input signal that receives out of the ordinary are in stable state, the first transistor and transistor seconds end simultaneously, are not subjected to first dynamic current and second dynamic current and increase with the first input end that causes operational amplifier and each other bias current of second input.
From another viewpoint, the invention provides a kind of operational amplifier again, its by two kinds of dynamic current supply circuits that the invention described above provided wherein a kind of joined now in the operational amplifier realize.
In the embodiment of the invention described above, the first above-mentioned transition is to turn to high potential state by low-potential state, and the second above-mentioned transition is to turn to low-potential state by high potential state.
In the embodiment of the invention described above, first above-mentioned dynamic current and the second above-mentioned dynamic current are distinctly provided by first current source and second current source, and this first current source therewith second current source have constant current source characteristic or variable current source characteristic.
In the embodiment of the invention described above, above-mentioned the first transistor is the PMOS transistor, and above-mentioned transistor seconds is a nmos pass transistor.
Dynamic current supply circuit provided by the present invention can be applied in now the operational amplifier, it is by utilizing two transistors, with when the input signal generation transition that is received out of the ordinary of the first input end of operational amplifier and second input (that is operational amplifier is in instantaneous), cause these two transistors synchronously or conducting asynchronously, so so that dynamic current of the bias current of the first input end of operational amplifier or second input increase.By this, dynamic current supply circuit provided by the present invention not only can reach and promote the inner revolution rate of operational amplifier, and more can be so that the power consumption of operational amplifier when being in stable state can not increase.
For above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment of the present invention cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 shows the operation amplifier circuit figure according to one embodiment of the invention.
Fig. 2 shows input signal, output signal, the first common mode current potential, the second common mode current potential, first dynamic current of the operational amplifier of one embodiment of the invention, and the relevant simulation waveform figure of second dynamic current.
Fig. 3 shows the operation amplifier circuit figure of another embodiment of the present invention.
Fig. 4 shows input signal, output signal, the first common mode current potential, the second common mode current potential, first dynamic current of the operational amplifier of another embodiment of the present invention, and the relevant simulation waveform figure of second dynamic current.
The reference numeral explanation
100,300: operational amplifier
101: input stage
103: gain stage
105: output stage
107,301: dynamic current supply circuit
IN1: first input end
IN2: second input
V
In: input signal
OUT: output
Vout, Vout_od, Vout_nw: output signal
V
NCOM: the first common mode current potential
V
PCOM: the second common mode current potential
Tr1: the first transistor
Tr2: transistor seconds
IMN: first dynamic current
IMP: second dynamic current
I
1: first current source
I
2: second current source
V: voltage
I: electric current
T: time
Embodiment
The technology effect that the present invention desired to reach is be to promote the inner revolution rate of operational amplifier, so that the transient response of operational amplifier accelerates and can handle the more signal of high frequency, and the consumed power when operational amplifier is in stable state also can not increase.And following content will be done one at technical characterictic of the present invention and the effect desiring to reach and encyclopaedize, and consider and examine to offer this invention those skilled in the relevant art.
Fig. 1 shows operational amplifier 100 circuit diagrams according to one embodiment of the invention.Please refer to Fig. 1, the operational amplifier 100 of present embodiment comprises input stage (input stage) 101, gain stage (gain stage) 103, output stage (output stage) 105, and dynamic current supply circuit 107.Wherein, input stage 101, gain stage 103 can utilize traditional operational amplifier to realize with output stage 105, and with this invention field have know usually the knowledgeable should be as can be known its each other circuit framework and function mode thereof, and, also no longer given unnecessary details it at this in order not obscure the spirit that institute of the present invention desire is set forth.
In addition, though input stage 101, gain stage 103 are depicted a possible circuit framework with output stage 105 in the present embodiment, but knowing this operator should be as can be known, each manufacturer is all different with the design of output stage 105 for input stage 101, gain stage 103, and therefore application of the present invention is when being not limited in the possible circuit framework of this kind.In other words, circuit designers substitutes input stage, gain stage and the output stage of different circuit frameworks when visual actual demand.
Generally speaking, the first input end I N1 of operational amplifier 100 and the second input IN2 input signal V that receives out of the ordinary
InThe output signal Vout that is exported with the output OUT of operational amplifier 100 has the first common mode current potential V
NCOMWith the second common mode current potential V
PCOMAnd the operational amplifier 100 of present embodiment mainly is after going into dynamic current supply circuit 107 by power, just make operational amplifier 100 inner revolution rates (internal slew rate) promote, allow Analog Circuit Design person when the Design Treatment high-frequency signal, just more can not be restricted by this.
Dynamic current supply circuit 107 comprises the first transistor Tr 1 and transistor seconds Tr 2.Wherein, the drain electrode of the output signal Vout, the first transistor Tr 1 that are exported in order to the output OUT that receives operational amplifier 100 of the grid of the first transistor Tr 1 is in order to receive the first common mode current potential V
NCOM, the source electrode of the first transistor Tr 1 is then in order to receive the first dynamic current IMN.The drain electrode of output signal Vout, transistor seconds Tr 2 that the grid of transistor seconds Tr 2 is exported in order to the output OUT that receives operational amplifier 100 is in order to receive the second common mode current potential V
PCOM, the source electrode of transistor seconds Tr2 is then in order to receive the second dynamic current IMP.In the present embodiment, the first transistor Tr1 is realized by the PMOS transistor, and transistor seconds Tr2 is realized by nmos pass transistor.
Fig. 2 shows the input signal V of present embodiment operational amplifier 100
In, output signal Vout, the first common mode current potential V
NCOM, the second common mode current potential V
PCOM, the first dynamic current IMN, and the relevant simulation waveform figure of the second dynamic current IMP, wherein, the longitudinal axis is representative voltage (V) and electric current (I) respectively, and transverse axis is represented the time (T), and output signal Vout comprises when not adding dynamic current supply circuit 107 the output signal Vout_od that the output OUT of operational amplifier 100 is exported, after adding dynamic current supply circuit 107, the output signal Vout_nw that the output OUT of operational amplifier 100 is exported.
Please merge with reference to Fig. 1 and Fig. 2, as the first input end IN1 and the second input IN2 input signal V that receives out of the ordinary of operational amplifier 100
InWhen first transition (that is turn to high potential state by low-potential state) took place, this moment was because the current potential of output signal Vout is lower than the first common mode current potential V
VCOMWith the second common mode current potential V
PCOMSo the first transistor Tr1 can conducting, and transistor seconds Tr2 can end, and so failing to be convened for lack of a quorum with the bias plasma of the first input end I N1 that causes operational amplifier 100 increases by the first dynamic current IMN.
In addition, as the first input end IN1 and the second input IN2 input signal V that receives out of the ordinary of operational amplifier 100
InWhen second transition (that is turn to low-potential state by high potential state) took place, this moment was because the current potential of output signal Vout is higher than the first common mode current potential V
NCOMWith the second common mode current potential V
PCOMSo the first transistor Tr1 can end, and transistor seconds Tr2 can conducting, and so failing to be convened for lack of a quorum with the bias plasma of the second input I N2 that causes operational amplifier 100 increases by the second dynamic current IMP.In the present embodiment, the first dynamic current IMN and the second dynamic current IMP are distinctly by the first current source I
1With the second current source I
2Institute provides, and this first current source I
1The second current source I therewith
2Have constant current source characteristic or variable current source characteristic.
And what deserves to be mentioned is at this, as the first input end IN1 and the second input IN2 input signal V that receives out of the ordinary of operational amplifier 100
InWhen first transition and second transition took place, this moment, operational amplifier 100 promptly was in instantaneous (transient), otherwise, then be in stable state (static).
So according to as can be known above-mentioned, the first transistor Tr1 and transistor seconds Tr2 can be in conducting when instantaneous at operational amplifier 100, the bias current that makes the first input end IN1 and the second input IN2 with correspondence increases by the first dynamic current IMN and the second dynamic current IMP severally, promote operational amplifier 100 inner revolution rates by this, so that the transient response of operational amplifier 100 is accelerated and can be handled the more signal of high frequency.
Moreover, when operational amplifier 100 is in stable state, the first transistor Tr1 and transistor seconds Tr2 promptly end, to such an extent as to the bias current of the first input end IN1 of operational amplifier 100 and the second input IN2 can not receive the first dynamic current IMN and the second dynamic current IMP severally.So, the long-pending position of utmost point zero point of operational amplifier 100 and gain frequency band can't produce change, so that the stability of operational amplifier 100 can increase is many, and the power consumption when operational amplifier 100 is in stable state can not become big yet.
Fig. 3 shows operational amplifier 300 circuit diagrams of another embodiment of the present invention.Please refer to Fig. 3, it is to be that dynamic current supply circuit 301 is different with dynamic current supply circuit 107 that the operational amplifier 300 of present embodiment does not exist together with the maximum of operational amplifier 100.In the present embodiment, dynamic current supply circuit 301 comprises the first transistor Tr1 and transistor seconds Tr2.Wherein, the grid of the first transistor Tr1 is in order to receive the second common mode current potential V
PCOM, the first transistor Tr1 drain electrode in order to receive the first common mode current potential V
NCOM, the source electrode of the first transistor Tr 1 is then in order to receive the first dynamic current IMN.The grid of transistor seconds Tr2 is in order to receive the first common mode current potential V
NCOM, transistor seconds Tr2 drain electrode in order to receive the second common mode current potential V
PCOM, the source electrode of transistor seconds Tr 2 is then in order to receive the second dynamic current IMP.In the present embodiment, the first transistor Tr1 is realized by the PMOS transistor, and transistor seconds Tr2 is realized by nmos pass transistor.
Fig. 4 shows the input signal V of present embodiment operational amplifier 300
InOutput signal Vout, the first common mode current potential V
NCOM, the second common mode current potential V
PCOM, the first dynamic current IMN, and the relevant simulation waveform figure of the second dynamic current IMP, wherein the longitudinal axis is distinguished representative voltage (V) and electric current (I), and transverse axis is represented the time (T), and output signal Vout comprises when not adding dynamic current supply circuit 301, the output signal Vout_od that the output OUT of operational amplifier 300 is exported, after adding dynamic current supply circuit 301, the output signal Vout_nw that the output OUT of operational amplifier 300 is exported.
Please merge with reference to Fig. 3 and Fig. 4, as the first input end IN1 and the second input IN2 input signal V that receives out of the ordinary of operational amplifier 300
InWhen first transition (that is turn to high potential state by low-potential state) and second transition (that is turn to low-potential state by high potential state) took place, this moment was because the second common mode current potential V
PCOMBe lower than the first common mode current potential V
NCOMSo the first transistor Tr 1 and transistor seconds Tr2 all can conductings, so failing to be convened for lack of a quorum with the bias plasma of the first input end IN1 that causes operational amplifier 300 and the second input IN2 increases by the first dynamic current IMN and the second dynamic current IMP severally.In the present embodiment, the first dynamic current IMN and the second dynamic current IMP are distinctly by the first current source I
1With the second current source I
2Institute provides, and this first current source I
1The second current source I therewith
2Have constant current source characteristic or variable current source characteristic.
So according to as can be known above-mentioned, the first transistor Tr1 and transistor seconds Tr2 can be in conducting when instantaneous at operational amplifier 300, the bias current that makes the first input end IN1 and the second input IN2 with correspondence increases by the first dynamic current IMN and the second dynamic current IMP severally, promotes operational amplifier 300 inner revolution rates by this.And what deserves to be mentioned is, because the first transistor Tr1 of present embodiment dynamic current supply circuit 301 and transistor seconds Tr2, no matter at input signal V
InAll can conducting when first transition or second transition take place, so during compared to dynamic current supply circuit 107, dynamic current supply circuit 301 can cause operational amplifier 300 inner revolution rates than operational amplifier 100 inner revolution rates next fast can handle so that the transient response of operational amplifier 300 adds faster than operational amplifier 100 signal of high frequency more.
Moreover, when operational amplifier 300 is in stable state, the first transistor Tr1 and transistor seconds Tr2 promptly end, to such an extent as to the bias current of the first input end IN1 of operational amplifier 300 and the second input IN2 can not receive the first dynamic current IMN and the second dynamic current IMP severally.So, the long-pending position of utmost point zero point of operational amplifier 300 and gain frequency band can not produce change yet, so that the stability of operational amplifier 300 also can increase is many, and the power consumption when operational amplifier 300 is in stable state can not become big yet.
In sum, the invention provides a kind of dynamic current supply circuit can be applied in now the operational amplifier, it is by utilizing two transistors, with when the input signal generation transition that is received out of the ordinary of the first input end of operational amplifier and second input (that is operational amplifier is in instantaneous), cause these two transistors synchronously or conducting asynchronously, so so that dynamic current of the bias current of the first input end of operational amplifier or second input increase.By this, dynamic current supply circuit provided by the present invention not only can reach the inner revolution rate of operational amplifier that promotes, and more can be so that the transient response of operational amplifier is accelerated and can be handled the more signal of high frequency, moreover the power consumption when operational amplifier is in stable state can not increase yet, can promote with its stability of time yet.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; anyly have the knack of this skill person; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the claim person of defining of the present invention.
Claims (16)
1. dynamic current supply circuit, be applicable to an operational amplifier, wherein, the output signal that one output of one first input end of this operational amplifier and one second an input input signal that receives out of the ordinary and this operational amplifier is exported has one first common mode current potential and one second common mode current potential, and this dynamic current supply circuit comprises:
One the first transistor, the grid of this first transistor is in order to receive this output signal, and the drain electrode of this first transistor is in order to receive this first common mode current potential, and the source electrode of this first transistor is then in order to receive one first dynamic current; And
One transistor seconds, the grid of this transistor seconds be in order to receiving this output signal, and the drain electrode of this transistor seconds is in order to receiving this second common mode current potential, and the source electrode of this transistor seconds is then in order to receiving one second dynamic current,
Wherein, when one first transition takes place in this first input end and this second input this input signal that receives out of the ordinary, this first transistor conducting, and this transistor seconds ends, bias current with this first input end of causing this operational amplifier increases this first dynamic current
When one second transition takes place in this first input end and this second input this input signal that receives out of the ordinary, this the first transistor ends, and this transistor seconds conducting increases this second dynamic current with this bias current of this second input of causing this operational amplifier, and
When this first input end and this second input this input signal that receives out of the ordinary are in stable state, this the first transistor and this transistor seconds end simultaneously, are not subjected to this first dynamic current and this second dynamic current and increase with this first input end of causing this operational amplifier and each other this bias current of this second input.
2. dynamic current supply circuit as claimed in claim 1, wherein, this first transition comprises by a low-potential state and turns to a high potential state, and this second transition comprises by this high potential state and turns to this low-potential state.
3. dynamic current supply circuit as claimed in claim 1, wherein, this first dynamic current and this second dynamic current are distinctly provided by one first current source and one second current source, and this first current source and this second current source have a certain current source characteristic or a variable current source characteristic.
4. dynamic current supply circuit as claimed in claim 1, wherein, this first transistor comprises a PMOS transistor, and this transistor seconds comprises a nmos pass transistor.
5. dynamic current supply circuit, be applicable to an operational amplifier, wherein, the output signal that one output of one first input end of this operational amplifier and one second an input input signal that receives out of the ordinary and this operational amplifier is exported has one first common mode current potential and one second common mode current potential, and this dynamic current supply circuit comprises:
One the first transistor, the grid of this first transistor is in order to receive this second common mode current potential, and the drain electrode of this first transistor is in order to receive this first common mode current potential, and the source electrode of this first transistor is then in order to receive one first dynamic current; And
One transistor seconds, the grid of this transistor seconds be in order to receiving this first common mode current potential, and the drain electrode of this transistor seconds is in order to receiving this second common mode current potential, and the source electrode of this transistor seconds is then in order to receiving one second dynamic current,
Wherein, when one first transition and one second transition take place in this first input end and this second input this input signal that receives out of the ordinary, this the first transistor and all conductings of this transistor seconds distinctly increase this first dynamic current and this second dynamic current with this first input end that causes this operational amplifier and a bias current of this second input; And
When this first input end and this second input this input signal that receives out of the ordinary are in stable state, this the first transistor and this transistor seconds end simultaneously, are not subjected to this first dynamic current and this second dynamic current and increase with this first input end of causing this operational amplifier and each other this bias current of this second input.
6. dynamic current supply circuit as claimed in claim 5, wherein, this first transition comprises by a low-potential state and turns to a high potential state, and this second transition comprises by this high potential state and turns to this low-potential state.
7. dynamic current supply circuit as claimed in claim 5, wherein, this first dynamic current and this second dynamic current are distinctly provided by one first current source and one second current source, and this first current source and this second current source have a certain current source characteristic or a variable current source characteristic.
8. dynamic current supply circuit as claimed in claim 5, wherein, this first transistor comprises a PMOS transistor, and this transistor seconds comprises a nmos pass transistor.
9. operational amplifier, wherein, the output signal that one output of one first input end of this operational amplifier and one second an input input signal that receives out of the ordinary and this operational amplifier is exported has one first common mode current potential and one second common mode current potential, and this operational amplifier comprises:
One dynamic current supply circuit comprises:
One the first transistor, the grid of this first transistor is in order to receive this output signal, and the drain electrode of this first transistor is in order to receive this first common mode current potential, and the source electrode of this first transistor is then in order to receive one first dynamic current; And
One transistor seconds, the grid of this transistor seconds be in order to receiving this output signal, and the drain electrode of this transistor seconds is in order to receiving this second common mode current potential, and the source electrode of this transistor seconds is then in order to receiving one second dynamic current,
Wherein, when one first transition takes place in this first input end and this second input this input signal that receives out of the ordinary, this first transistor conducting, and this transistor seconds ends, bias current with this first input end of causing this operational amplifier increases this first dynamic current
When one second transition takes place in this first input end and this second input this input signal that receives out of the ordinary, this the first transistor ends, and this transistor seconds conducting increases this second dynamic current with this bias current of this second input of causing this operational amplifier, and
When this first input end and this second input this input signal that receives out of the ordinary are in stable state, this the first transistor and this transistor seconds end simultaneously, are not subjected to this first dynamic current and this second dynamic current and increase with this first input end of causing this operational amplifier and each other this bias current of this second input.
10. operational amplifier as claimed in claim 9, wherein, this first transition comprises by a low-potential state and turns to a high potential state, and this second transition comprises by this high potential state and turns to this low-potential state.
11. operational amplifier as claimed in claim 9, wherein, this first dynamic current and this second dynamic current are distinctly provided by one first current source and one second current source, and this first current source and this second current source have a certain current source characteristic or a variable current source characteristic.
12. operational amplifier as claimed in claim 9, wherein, this first transistor comprises a PMOS transistor, and this transistor seconds comprises a nmos pass transistor.
13. operational amplifier, wherein, the output signal that one output of one first input end of this operational amplifier and one second an input input signal that receives out of the ordinary and this operational amplifier is exported has one first common mode current potential and one second common mode current potential, and this operational amplifier comprises:
One dynamic current supply circuit comprises:
One the first transistor, the grid of this first transistor is in order to receive this second common mode current potential, and the drain electrode of this first transistor is in order to receive this first common mode current potential, and the source electrode of this first transistor is then in order to receive one first dynamic current; And
One transistor seconds, the grid of this transistor seconds be in order to receiving this first common mode current potential, and the drain electrode of this transistor seconds is in order to receiving this second common mode current potential, and the source electrode of this transistor seconds is then in order to receiving one second dynamic current,
Wherein, when one first transition and one second transition take place in this first input end and this second input this input signal that receives out of the ordinary, this the first transistor and all conductings of this transistor seconds distinctly increase this first dynamic current and this second dynamic current with this first input end that causes this operational amplifier and a bias current of this second input; And
When this first input end and this second input this input signal that receives out of the ordinary are in stable state, this the first transistor and this transistor seconds end simultaneously, are not subjected to this first dynamic current and this second dynamic current and increase with this first input end of causing this operational amplifier and each other this bias current of this second input.
14. operational amplifier as claimed in claim 13, wherein, this first transition comprises by a low-potential state and turns to a high potential state, and this second transition comprises by this high potential state and turns to this low-potential state.
15. operational amplifier as claimed in claim 13, wherein, this first dynamic current and this second dynamic current are distinctly provided by one first current source and one second current source, and this first current source and this second current source have a certain current source characteristic or a variable current source characteristic.
16. operational amplifier as claimed in claim 13, wherein, this first transistor comprises a PMOS transistor, and this transistor seconds comprises a nmos pass transistor.
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|---|---|---|---|
| CN2007101025665A CN101309070B (en) | 2007-05-14 | 2007-05-14 | Operational amplifier and dynamic current supply circuit |
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|---|---|---|---|
| CN2007101025665A CN101309070B (en) | 2007-05-14 | 2007-05-14 | Operational amplifier and dynamic current supply circuit |
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| CN101309070B true CN101309070B (en) | 2011-12-07 |
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| CN102780464B (en) * | 2012-08-14 | 2015-07-22 | 旭曜科技股份有限公司 | Single-gain buffer with increased slew rate |
| CN104065354B (en) * | 2013-03-18 | 2017-06-09 | 联咏科技股份有限公司 | Operation amplifier circuit |
| TWI530087B (en) * | 2013-08-06 | 2016-04-11 | 瑞鼎科技股份有限公司 | High slew rate operational amplifier and operating method thereof |
| TWI524663B (en) * | 2014-03-19 | 2016-03-01 | 聯詠科技股份有限公司 | Operational amplifier and driving circuit |
| CN115328252B (en) * | 2022-08-29 | 2023-11-03 | 复旦大学 | Operational amplifier circuit and LDO circuit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5510754A (en) * | 1994-11-18 | 1996-04-23 | National Semiconductor Corporation | Fast slewing amplifier using dynamic current mirrors |
| CN1211855A (en) * | 1997-09-04 | 1999-03-24 | 日本电气株式会社 | Operational amplifier |
| US6864704B1 (en) * | 2003-09-24 | 2005-03-08 | Altera Corporation | Adjustable differential input and output drivers |
| US6987420B2 (en) * | 2002-10-01 | 2006-01-17 | Nec Electronics Corporation | Operational amplifier with self control circuit for realizing high slew rate throughout full operating range |
| US7102436B2 (en) * | 2004-02-17 | 2006-09-05 | Novatek Microelectronics Corp. | Apparatus and method for increasing a slew rate of an operational amplifier |
-
2007
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5510754A (en) * | 1994-11-18 | 1996-04-23 | National Semiconductor Corporation | Fast slewing amplifier using dynamic current mirrors |
| CN1211855A (en) * | 1997-09-04 | 1999-03-24 | 日本电气株式会社 | Operational amplifier |
| US6100762A (en) * | 1997-09-04 | 2000-08-08 | Nec Corportion | Operational amplifier having a wide input/output range and an improved slew rate |
| US6987420B2 (en) * | 2002-10-01 | 2006-01-17 | Nec Electronics Corporation | Operational amplifier with self control circuit for realizing high slew rate throughout full operating range |
| US7049890B2 (en) * | 2002-10-01 | 2006-05-23 | Nec Electronics Corporation | Operational amplifier with self control circuit for realizing high slew rate throughout full operating range |
| US6864704B1 (en) * | 2003-09-24 | 2005-03-08 | Altera Corporation | Adjustable differential input and output drivers |
| US7102436B2 (en) * | 2004-02-17 | 2006-09-05 | Novatek Microelectronics Corp. | Apparatus and method for increasing a slew rate of an operational amplifier |
| US7173490B2 (en) * | 2004-02-17 | 2007-02-06 | Novatek Microelectronics Corp. | Apparatus and method for increasing a slew rate of an operational amplifier |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101309070A (en) | 2008-11-19 |
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