CN106341092A - Low-voltage and low-power-consumption operational amplifier - Google Patents
Low-voltage and low-power-consumption operational amplifier Download PDFInfo
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- CN106341092A CN106341092A CN201610685145.9A CN201610685145A CN106341092A CN 106341092 A CN106341092 A CN 106341092A CN 201610685145 A CN201610685145 A CN 201610685145A CN 106341092 A CN106341092 A CN 106341092A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
- H03F3/45376—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using junction FET transistors as the active amplifying circuit
- H03F3/45381—Long tailed pairs
- H03F3/4539—Folded cascode stages
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
- H03F2203/45—Indexing scheme relating to differential amplifiers
- H03F2203/45028—Indexing scheme relating to differential amplifiers the differential amplifier amplifying transistors are folded cascode coupled transistors
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Abstract
The invention discloses a low-voltage and low-power-consumption operational amplifier which comprises a first part, a second part and a third part, wherein the first part serves as an input end and is provided with a differential amplification stage and a transconductance constant control circuit connected with a differential amplification stage circuit; the second part is provided with a folded cascade amplification stage, the folded cascade amplification stage is connected with the differential amplification stage circuit of the first part, then the first part and the second part form first-stage amplification of the operational amplifier; the third part is provided with an AB biasing circuit and a rail-to-rail output stage which are respectively connected with the circuit of the second part, so that the rail-to-rail output stage forms second-stage amplification of the operational amplifier under the control of the AB biasing circuit; the AB biasing circuit comprises a clamping circuit, so that when the operational amplifier provides or absorbs the current of a peripheral circuit, the grid voltage of the rail-to-rail output stage is controlled to enable the operational amplifier to show the characteristic of low power consumption. When the current of the peripheral circuit is provided or absorbed, the characteristic of low power consumption is shown.
Description
Technical field
The present invention relates to IC design technical field is and in particular to one kind can be widely applied for signal processing and letter
The Low-voltage Low-power universal input output track to track operational amplifier of number amplification system.
Background technology
Operational amplifier is widely used in consumer electronics device, and communication equipment, in industrial control system and medical device.
With the extensive application of portable equipment, it is more and more important that the amplifier of low supply voltage, and low-power consumption becomes.The input of ab class is defeated
Go out track to track operational amplifier and possess low-power consumption, the characteristic of high-gain.
But, operational amplifier of the prior art, as shown in Figures 1 to 3, when when the electric current of peripheral circuit to be absorbed,
The electric current required for operational amplifier inside can be shown and become big, cause the power consumption of whole operational amplifier to become big problem, do not have
There is the purpose reaching operational amplifier low-power consumption.
Content of the invention
It is an object of the invention to provide a kind of Low-voltage Low-power operational amplifier, providing or absorbing peripheral circuit
During electric current, all show low power consumption characteristic.
In order to achieve the above object, the present invention is achieved through the following technical solutions: a kind of Low-voltage Low-power operation amplifier
Device, is characterized in,
In described operational amplifier, comprise the three below part that circuit successively connects:
As the Part I of input, it is provided with differential amplifier stage, and with described differential amplifier stage circuit even
The mutual conductance constant control circuit connecing；
Part II, the Foldable cascade amplifier stage being provided with, the differential amplifier stage electricity with described Part I
Road connects, and so that the first order that described Part I constitutes described operational amplifier together with Part II is amplified；
Part III, the ab class biasing circuit being provided with and track to track output stage, respectively with described Part II circuit
Connect, make described track to track output stage under the control of described ab class biasing circuit, constitute the second level of described operational amplifier
Amplify；
Described ab class biasing circuit comprises a clamp circuit, when described operational amplifier is providing or absorbing peripheral circuit
Electric current when, control track to track output stage grid voltage so that operational amplifier assumes low power consumption characteristic.
In the differential amplifier stage of described Part I, comprise a pair of n-type transistor and the one first tail electricity of circuit connection
Stream source, and circuit connect a pair of p-type transistor and one second tail current source；The mutual conductance constant control circuit of described Part I
By two output branch roads, circuit connects to two described tail current sources respectively；
In described mutual conductance constant control circuit, comprise further:
A first transistor, a pair of transistor seconds and the 3rd crystal that in a tie point, circuit connects
Pipe；
The 4th transistor, a pair the 5th transistors and the 6th crystal that on second branch road, circuit connects
Pipe.
In described mutual conductance constant control circuit, flow through the electric current of transistor seconds described in a pair and flow through described first
Point a pair of p-type transistor current in proportion, its proportional numerical value is equal to and flows through the electric current of described the first transistor and described the
The proportional numerical value that the electric current of one tail current source is compared；
And, flow through the electric current of the 5th transistor described in a pair and a pair of n-type transistor flowing through described Part I
Current in proportion, the proportional that its proportional numerical value is compared equal to the electric current of the second tail current source described in described 6th transistor AND gate
Value.
In described mutual conductance constant control circuit, the electric current summation flowing through in third transistor and the 4th transistor is one
Not with the fixed value of common mode operating point change, and, the electric current summation flowing through in the first transistor and the 6th transistor is also one
Individual not with common mode operating point change fixed value so that the electric current summation flowing through in the first tail current source and the second tail current source not
Change with common mode operating point change.
In described mutual conductance constant control circuit, the minimum running voltage in described tie point is described first crystal
The summation that the gate source voltage of the source-drain voltage of pipe, the source-drain voltage of transistor seconds, and third transistor is added；That is, described
The running voltage of one branch road is more than or equal to 1.55v；
And, the minimum running voltage on described second branch road is the source gate voltage of described 4th transistor, the 5th crystal
The drain-source voltage of pipe, and the summation that the drain-source voltage of the 6th transistor is added；That is, the running voltage of described second branch road be more than etc.
In 1.55v.
The collapsible common source of described Part II amplifier stage altogether, comprises circuit and connects several the 7th transistors composition
Cascade amplifier stage, the difference that circuit connects other several the 8th transistors and gain amplifier is constituted arrives singly
The modular converter at end, and control the biased amplifier of bias current needed for Part II by first current source.
Two inputs of internal auxiliary OP AMP are further comprised as in the cascade amplifier stage of described Part II
Transistor；By a loop negative feedback of setting in the ab class biasing circuit of described Part III, make this two inputs brilliant
The voltage at the grid two ends of body pipe is the same；
Described loop negative feedback, comprises further:
The 9th transistor, the tenth transistor and the 11st transistor that on the 3rd branch road, circuit connects；
The tenth two-transistor and the 13rd transistor that on the 4th branch road, circuit connects；
In the track to track output stage of described Part III, comprise the first output crystal being connected with ab class biasing circuit circuit
Pipe and the second output transistor；
Wherein, circuit connects the tenth two-transistor one the first current mirror of formation described in described 9th transistor AND gate；Circuit
Connect the first output transistor described in described tenth transistor AND gate and form second current mirror；It is trimorphism that circuit connects the described tenth
Body pipe forms the 3rd current mirror with described second output transistor；
By two input transistors of internal auxiliary OP AMP, the first current mirror, the second current mirror and the 3rd current mirror, make
The quiescent current obtaining each transistor in Part III can be by second current source of setting in ab class biasing circuit
Current value determines.
Described clamp circuit comprises a clamping transistor, respectively with the 4th branch road on the tenth two-transistor and the 13rd
Transistor circuit connects, and a bias voltage source is arranged on the grid of described clamping transistor.
When the number of tubes ratio of the tenth transistor and the first output transistor is 1: 3n, the 13rd transistor and second defeated
The number of tubes ratio setting going out transistor becomes 1: n, and flows through the ratio of the electric current of the 9th transistor AND gate the tenth two-transistor
When being 1: 1, then the ratio flowing through the electric current of the tenth transistor and the first output transistor is 1: 3n, flow through the 13rd transistor and
The ratio of the electric current of the second output transistor is 1: n；
Assume that the electric current that the 13rd crystal pipe flow is crossed is i, then flow through on the first output transistor and the second output transistor
Electric current be n*i；If the tenth transistor is operated in saturation region, the electric current that the tenth transistor flows through is 1/3*i；
Therefore, when the outfan out end of described Part III setting does not have output current, the 9th transistor would operate in
Linear zone is so that the electric current that the tenth two-transistor flows through is 3 times of the electric current that the 9th transistor flows through.
In described ab class biasing circuit, the minimum running voltage of the 3rd branch road is the source-drain voltage of the 9th transistor, the
The source-drain voltage of ten transistors, and the summation that the gate source voltage of the 11st transistor is added；That is, the work electricity of described 3rd branch road
Pressure is more than or equal to 1.55v；
The minimum running voltage of the 4th branch road is the source gate voltage of the tenth two-transistor, and the drain-source electricity of the 13rd transistor
The summation that pressure is added；That is, the running voltage of described 4th branch road is more than or equal to 1.4v.
A kind of present invention Low-voltage Low-power operational amplifier compared with prior art has the advantage that the present invention passes through
Increase a clamp circuit in ab class biasing circuit so that operational amplifier is in the electric current of offer or absorption peripheral circuit,
All show low power consumption characteristic.
Brief description
Fig. 1 is a kind of overall structure diagram of Low-voltage Low-power operational amplifier；
Fig. 2 is the overall structure diagram of mutual conductance constant control circuit；
Fig. 3 is the overall structure diagram of ab class biasing circuit of the prior art；
Fig. 4 is the overall structure diagram of the ab class biasing circuit of the present invention.
Specific embodiment
Below in conjunction with accompanying drawing, by describing a preferably specific embodiment in detail, the present invention is further elaborated.
As shown in figure 1, being that in prior art, a kind of using is designed on 0.35um standard cmos Process ba- sis, minimum work electricity
Pressure energy is enough reduced to the high-gain universal input output track to track operational amplifier of 1.6v.
Cooperation referring to shown in Fig. 2, Fig. 3, operational amplifier of the prior art, comprise the three below that circuit connects successively
Part: as the Part I of input, it is provided with differential amplifier stage, and be connected with described differential amplifier stage circuit
Mutual conductance constant control circuit 121；Part II, the Foldable cascade amplifier stage being provided with, with described Part I
Differential amplifier stage circuit connects, and so that the first order that described Part I constitutes described operational amplifier together with Part II is put
Greatly；Part III, the ab class biasing circuit 109 being provided with and track to track output stage, respectively with described Part II circuit even
Connect, make described track to track output stage under the control of described ab class biasing circuit 109, constitute the second level of described operational amplifier
Amplify.Due to be respectively adopted minimum running voltage in 1.6v about constant transconductance control circuit (as shown in Figure 2) and ab class
Biasing circuit (as shown in Figure 3), so that the minimum running voltage of ab class operational amplifier can be reduced to 1.6v, has high increasing
Benefit, high PSRR, characters at low voltage ranges.
As shown in figure 1, comprising a pair of n-type transistor 124 and 125, a pair of p-type transistor in the input stage of Part I
122 and 123, and tail current source 101 and 120, its connected mode and operation principle corresponding in input to conventional amplifiers
Device is similar, and specific annexation is referring to Fig. 1.Transistor 122 He when inm and inp end differential signal is close to ground potential
123 work, transistor 124 and 125 work when inm and inp end differential signal is close to supply voltage, when inm and inp end difference
When signal is in the middle of supply voltage, two work to transistor simultaneously.Cannot be below to solve minimum running voltage in routine techniquess
The problem of 2.5v, employs mutual conductance constant control circuit 121 as shown in Figure 2, and mutual conductance constant control circuit 121 passes through two
Road 126,127 is respectively connecting to tail current source 101 and 120.
Current source 211 and some transistors 201～215 is comprised, between each device in described mutual conductance constant control circuit 121
Annexation referring to Fig. 2.Wherein, flow through the electric current flowing through transistor 122,123 in the electric current of transistor 208,209 and Fig. 1
Proportional, its proportional numerical value is equal to proportional numerical value compared with the electric current of tail current source 101 for the electric current flowing through transistor 106；Stream
Cross the current in proportion flowing through transistor 124,125 in the electric current of transistor 107,110 and Fig. 1, its proportional numerical value is equal to crystal
Proportional numerical value compared with the electric current of tail current source 120 for the pipe 215, as long as so control the 206 and 215 electric current summations that flow through not with
Common mode operating point changes, then the electric current summation that in Fig. 1, tail current source 101 and 120 flows through also will not change with common mode operating point, reaches
To the purpose that input stage mutual conductance is constant.
In addition, in fig. 2, the electric current that transistor 206 flows through flows through transistor 214 simultaneously, and, by transistor 213 He
204 duplications give transistor 203；The electric current that transistor 215 flows through is replicated by transistor 205 simultaneously and gives transistor 202, and brilliant
The electric current that body pipe 202 and 203 flows through is equal to the fixed current that current source 211 gives, so the electricity flowing through in transistor 205
Stream is a fixed value plus the electric current flowing through in transistor 214, and in the same manner, the electric current flowing through in transistor 206 adds transistor
The current value flowing through in 215 is also a fixed value, and therefore, the mutual conductance constant control circuit 121 shown in Fig. 2 ensure that in Fig. 1
The electric current that input stage flows through does not change with common mode operating point and changes.In fig. 2 it is also found that highest is required to supply voltage
Branch road may for transistor 206,208,214 be located a road or transistor 205,207,215 be located a road.
The minimum running voltage on this road of transistor 206,208 and 214 is:
Vdd=vSd, 206+vSd, 208+vGs, 214>=0.15v+0.15v+1.1v+0.15v=1.55v
The minimum running voltage on this road of transistor 205,207 and 215 is:
Vdd=vSg, 205+vDs, 207+vDs, 215>=0.15v+1.1v+0.15v+0.15v=1.55v
Therefore, the requirement to vdd minima for the mutual conductance constant control circuit 121 that Fig. 2 is represented is reduced to 1.6v,
Substantially reduce compared with the minima of vdd being required with conventional constant-gm circuit.
In the present embodiment, in operational amplifier, Part II is collapsible common source altogether amplifier stage, its connected mode and
The operation principle and conventional amplifiers corresponding device in input is similar, and specific annexation is referring to Fig. 1.I.e., mainly
Comprise the cascade amplifier stage of transistor 112,113,118 and 119 composition, transistor 104,105,107 and 108 and gain are put
The differential-to-single-ended conversion of big device 106 composition；And, current source 102, transistor 114 1 tunnel connect to biased amplifier
117, the bias current needed for Part II is controlled by current source 116 by this biased amplifier 117.
In the present embodiment, operational amplifier, comprises the track to track output of transistor 210 and 211 composition in Part III
Level, and by arranging ab class biasing circuit as shown in Figure 3, for solving ab class biasing circuit minimum work electricity in routine techniquess
Pressure cannot be below the problem of 2.5v.
The connection of related device in ab class biasing circuit 109 and transistor 110 and 111 and Part II, please refer to
Shown in Fig. 1, Fig. 3.Wherein, transistor 112a and 112b can be understood as two input crystalline substances of the internal auxiliary OP AMP of transistor 112
Body pipe, ensure that transistor 112a and 112b grid by the loop negative feedback of transistor 306,304,303,305,307 composition
The voltage at two ends is the same, so electric current determined by current source 301, according to the ratio of the electric current flowing through transistor 307 and 308,
Duplication gives transistor 303 and 305.Here become 1 305 with 110 number of tubes ratio setting: 3n, 306 and 111
Number of tubes ratio setting become 1: n it is assumed that the ratio flowing through the electric current of transistor 303 and 304 is 1: 1, flow through transistor 305
It is 1 with the ratio of 110 electric current: 3n, the ratio flowing through the electric current of transistor 306 and 111 is 1: n it is assumed that transistor 306 flows through
Electric current be i, then transistor 110, the electric current flowing through on 111 be n*i, if transistor 305 is operated in saturation region, transistor
305 electric currents flowing through are 1/3*i, so when the outfan out end of operational amplifier shown in Fig. 1 does not have output current, crystal
Pipe 303 would operate in linear zone so that flow through for transistor 303 3 times of electric current of electric current that transistor 304 flows through.By interior
Portion's auxiliary OP AMP and transistor 303,304；Transistor 306,111 and 305,110 3 current mirrors of transistor are so that each is brilliant
The quiescent current of body pipe can be determined by the current value of current source 301.Drive when operational amplifier will provide to peripheral electric current
During electric current, 309 points of voltage potential reduces, and 310 points of current potential also and then reduces so that transistor 303 slowly departs from line simultaneously
Property area because making the electric current of transistor 303 be fixed by the electric current of transistor 307 by internal booster amplifier, pass through
Transistor 303,304 current mirror mirror images diminish at leisure to the electric current of transistor 304, by transistor 306,111 current mirror mirrors
As the electric current to transistor 111 equally reduces.Assuming that amplifier will absorb during the electric current of peripheral circuit is also in the same manner, presents
The characteristic of good ab class circuit.
Wherein, the minimum running voltage on this road of transistor 303,305,307 is:
Vdd=vSd, 303+vSd, 305+vGs, 307>=0.15v+0.15v+1.1v+0.15v=1.55v
Transistor 304, the minimum running voltage on 306 this road are:
Vdd=vSg, 304+vDs, 306>=1.1v+0.15v+0.15v=1.4v
Therefore, the requirement to vdd minima for the ab class biasing circuit 109 that Fig. 3 is represented is reduced to 1.6v, and normal
With ab class biasing circuit, the minima of vdd is required to compare to substantially reduce.
However, when operational amplifier will absorb the electric current of peripheral circuit, 310 points of voltage potential raises, and 304 is two
Pole pipe form is connected to supply voltage, and 306 grid voltage current potentials raise, and cause 304,306 this road that very big electric current occurs, fortune
The power consumption calculating amplifier becomes much larger, is not reaching to the purpose of operational amplifier low-power consumption.
I other words, the operational amplifier that Fig. 1, Fig. 2, Fig. 3 are formed will absorb the electricity of peripheral circuit when operational amplifier
During stream, the electric current required for operational amplifier inside can be shown and become big, cause the power consumption of whole operational amplifier to become big asking
Topic, is not reaching to the purpose of operational amplifier low-power consumption.
In order to solve this problem, the present invention arranges a clamp circuit in ab class biasing circuit 109, as shown in figure 4, working as
Described operational amplifier, in the electric current of offer or absorption peripheral circuit, controls (i.e. 409 points of the grid voltage of track to track output stage
Voltage, the grid voltage of transistor 111) so that operational amplifier assumes low power consumption characteristic.
As shown in figure 4, described clamp circuit comprises a clamping transistor 500, and a bias voltage source 501, clamp crystalline substance
Body pipe 500 is connected with transistor 404 and 406, and bias voltage source 501 is arranged on the grid of described clamping transistor.Increased
Under the design of this clamping transistor 500, when operational amplifier absorbs the electric current of peripheral circuit, 409 points of voltage (transistor
111 grid voltage) lifting, when being lifted to very high, transistor 111 can enter linear zone although transistor 406 also can be followed
Transistor 111 enters linear zone, but the presence due to clamping transistor 500, the electric current of transistor 406 is by clamping transistor 500
And the bias voltage source 501 of its grid is setting, it is to avoid prior art transistor 404 and transistor in this condition
This branch road at 406 places occur the shortcoming of very high current, are truly realized the setting of operational amplifier of Low-voltage Low-power
Meter.
Although present disclosure has been made to be discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
Multiple modifications and substitutions all will be apparent from.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. a kind of Low-voltage Low-power operational amplifier it is characterised in that
In described operational amplifier, comprise the three below part that circuit successively connects:
As the Part I of input, it is provided with differential amplifier stage, and be connected with described differential amplifier stage circuit
Mutual conductance constant control circuit；
Part II, the Foldable cascade amplifier stage being provided with, connect with the differential amplifier stage circuit of described Part I
Connect, so that the first order that described Part I constitutes described operational amplifier together with Part II is amplified；
Part III, the ab class biasing circuit being provided with and track to track output stage, are connected with described Part II circuit respectively,
Make described track to track output stage under the control of described ab class biasing circuit, the second level constituting described operational amplifier is amplified；
Described ab class biasing circuit comprises a clamp circuit, when described operational amplifier is in the electricity providing or absorbing peripheral circuit
During stream, control the grid voltage of track to track output stage, so that operational amplifier assumes low power consumption characteristic.
2. Low-voltage Low-power operational amplifier as claimed in claim 1 is it is characterised in that the difference of described Part I
In amplifier stage, comprise a pair of n-type transistor and one first tail current source of circuit connection, and a pair of p-type crystal that circuit connects
Pipe and one second tail current source；The mutual conductance constant control circuit of described Part I passes through two output branch roads, and circuit connects respectively
To two described tail current sources；
In described mutual conductance constant control circuit, comprise further:
A first transistor, a pair of transistor seconds and a third transistor that in a tie point, circuit connects；
The 4th transistor, a pair the 5th transistors and the 6th transistor that on second branch road, circuit connects.
3. Low-voltage Low-power operational amplifier as claimed in claim 2 is it is characterised in that described mutual conductance constant control is electric
Lu Zhong, the electric current of the electric current and a pair of p-type transistor flowing through described Part I that flow through transistor seconds described in a pair becomes ratio
Example, its proportional numerical value is equal to proportional compared with the electric current of described first tail current source for the electric current flowing through described the first transistor
Value；
And, flow through the electric current of the electric current of the 5th transistor described in a pair and a pair of n-type transistor flowing through described Part I
Proportional, the proportional numerical value that its proportional numerical value is compared equal to the electric current of the second tail current source described in described 6th transistor AND gate.
4. Low-voltage Low-power operational amplifier as claimed in claim 3 is it is characterised in that described mutual conductance constant control is electric
The electric current summation flowing through in Lu Zhong, third transistor and the 4th transistor is a fixed value not changed with common mode operating point,
And, the electric current summation flowing through in the first transistor and the 6th transistor is also one not with the fixation of common mode operating point change
Value is not so that the electric current summation flowing through in the first tail current source and the second tail current source changes with common mode operating point and changes.
5. Low-voltage Low-power operational amplifier as claimed in claim 4 is it is characterised in that described mutual conductance constant control is electric
Lu Zhong, the minimum running voltage in described tie point is the source-drain voltage of described the first transistor, the source of transistor seconds
Drain voltage, and the summation that the gate source voltage of third transistor is added；That is, the running voltage of described tie point is more than or equal to
1.55v；
And, the minimum running voltage on described second branch road is the source gate voltage of described 4th transistor, the 5th transistor
Drain-source voltage, and the summation that the drain-source voltage of the 6th transistor is added；That is, the running voltage of described second branch road is more than or equal to
1.55v.
6. the Low-voltage Low-power operational amplifier as described in claim 1 or 5 is it is characterised in that described Part II
Collapsible common source amplifier stage altogether, comprises the cascade amplifier stage that circuit connects several the 7th transistors composition, and circuit is even
Connect the differential-to-single-ended modular converter that several other the 8th transistors and a gain amplifier are constituted, and pass through one
Individual first current source controls the biased amplifier of bias current needed for Part II.
7. Low-voltage Low-power operational amplifier as claimed in claim 6 is it is characterised in that the common source of described Part II
Two input transistors of internal auxiliary OP AMP are further comprised as altogether in grid amplifier stage；By the ab in described Part III
In class biasing circuit, a loop negative feedback of setting, makes the voltage at the grid two ends of this two input transistors the same；
Described loop negative feedback, comprises further:
The 9th transistor, the tenth transistor and the 11st transistor that on the 3rd branch road, circuit connects；
The tenth two-transistor and the 13rd transistor that on the 4th branch road, circuit connects；
In the track to track output stage of described Part III, comprise the first output transistor of being connected with ab class biasing circuit circuit and
Second output transistor；
Wherein, circuit connects the tenth two-transistor one the first current mirror of formation described in described 9th transistor AND gate；Circuit connects
Described in described tenth transistor AND gate, the first output transistor forms second current mirror；Circuit connects described 13rd transistor
Form the 3rd current mirror with described second output transistor；
By two input transistors of internal auxiliary OP AMP, the first current mirror, the second current mirror and the 3rd current mirror so that
Three partly in each transistor quiescent current can by ab class biasing circuit setting second current source electric current
Value determines.
8. Low-voltage Low-power operational amplifier as claimed in claim 7 is it is characterised in that described clamp circuit comprises one
Clamping transistor, is connected with the tenth two-transistor on the 4th branch road and the 13rd transistor circuit, a bias voltage source respectively
It is arranged on the grid of described clamping transistor.
9. Low-voltage Low-power operational amplifier as claimed in claim 7 is it is characterised in that when the tenth transistor and first defeated
The number of tubes ratio going out transistor is 1: 3n, and the number of tubes ratio setting of the 13rd transistor and the second output transistor becomes
1: n, and when to flow through the ratio of the electric current of the 9th transistor AND gate the tenth two-transistor be 1: 1, then flow through the tenth transistor and
The ratio of the electric current of one output transistor is 1: 3n, and the ratio flowing through the electric current of the 13rd transistor and the second output transistor is
1∶n；
Assume that the electric current that the 13rd crystal pipe flow crosses is i, then the electricity flowing through on the first output transistor and the second output transistor
Flow for n*i；If the tenth transistor is operated in saturation region, the electric current that the tenth transistor flows through is 1/3*i；
Therefore, when the outfan out end of described Part III setting does not have output current, the 9th transistor would operate in linearly
Area is so that the electric current that the tenth two-transistor flows through is 3 times of the electric current that the 9th transistor flows through.
10. high-gain high PSRR ab class operational amplifier as claimed in claim 9 is it is characterised in that described ab class
In biasing circuit, the minimum running voltage of the 3rd branch road is the source-drain voltage of the 9th transistor, the source-drain voltage of the tenth transistor,
And the 11st transistor gate source voltage be added summation；That is, the running voltage of described 3rd branch road is more than or equal to 1.55v；
The minimum running voltage of the 4th branch road is the source gate voltage of the tenth two-transistor, and the drain-source voltage phase of the 13rd transistor
Plus summation；That is, the running voltage of described 4th branch road is more than or equal to 1.4v.
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| CN201610685145.9A CN106341092A (en) | 2016-08-18 | 2016-08-18 | Low-voltage and low-power-consumption operational amplifier |
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| CN201610685145.9A CN106341092A (en) | 2016-08-18 | 2016-08-18 | Low-voltage and low-power-consumption operational amplifier |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106936401A (en) * | 2017-03-16 | 2017-07-07 | 苏州源智宇电子科技有限公司 | High performance operational amplifier is may be programmed after one kind encapsulation |
| CN107834986A (en) * | 2017-11-21 | 2018-03-23 | 中国地质大学（北京） | Single-stage AB classes operation transconductance amplifier and analog circuit |
| CN112468091A (en) * | 2019-09-06 | 2021-03-09 | 美国亚德诺半导体公司 | Amplifier biasing techniques |
| CN114123988A (en) * | 2021-11-30 | 2022-03-01 | 深圳列拓科技有限公司 | Constant transconductance rail-to-rail input and output operational amplifier |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106936401A (en) * | 2017-03-16 | 2017-07-07 | 苏州源智宇电子科技有限公司 | High performance operational amplifier is may be programmed after one kind encapsulation |
| CN106936401B (en) * | 2017-03-16 | 2021-06-29 | 聚洵半导体科技（上海）有限公司 | Programmable high-performance operational amplifier after packaging |
| CN107834986A (en) * | 2017-11-21 | 2018-03-23 | 中国地质大学（北京） | Single-stage AB classes operation transconductance amplifier and analog circuit |
| CN107834986B (en) * | 2017-11-21 | 2020-04-03 | 中国地质大学（北京） | Single-stage AB class operational transconductance amplifier and analog circuit |
| CN112468091A (en) * | 2019-09-06 | 2021-03-09 | 美国亚德诺半导体公司 | Amplifier biasing techniques |
| CN114123988A (en) * | 2021-11-30 | 2022-03-01 | 深圳列拓科技有限公司 | Constant transconductance rail-to-rail input and output operational amplifier |
| CN114123988B (en) * | 2021-11-30 | 2024-02-23 | 深圳列拓科技有限公司 | Constant cross-guide rail to rail input/output operational amplifier |
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