CN107968635A - Electric current reclaiming type amplifier and analog circuit - Google Patents
Electric current reclaiming type amplifier and analog circuit Download PDFInfo
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- CN107968635A CN107968635A CN201711170110.2A CN201711170110A CN107968635A CN 107968635 A CN107968635 A CN 107968635A CN 201711170110 A CN201711170110 A CN 201711170110A CN 107968635 A CN107968635 A CN 107968635A
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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
Abstract
The present invention provides a kind of electric current reclaiming type amplifier and analog circuit, it is related to amplifier technique field, which includes the AB classes input stage, common-mode feedback intergrade and rail-to-rail output stage being electrically connected to each other；AB classes input stage includes turnover voltage follower, bias current sources, the first Differential Input pair and the second Differential Input pair, and common-mode feedback intergrade is supplied to for input voltage signal to be converted into current signal；Common-mode feedback intergrade includes local common mode feedback circuit, for being supplied to rail-to-rail output stage after the current signal is amplified；Rail-to-rail output stage is used to the amplified current signal is converted into voltage signal and is exported.Electric current reclaiming type amplifier provided by the invention increases in the case of low-power consumption the output current of input stage, allow amplifier into the amplification differential input signal of biquadratic times, so as to greatly improve the gain bandwidth product and slew rate of amplifier.
Description
Technical field
The present invention relates to amplifier technique field, more particularly, to a kind of electric current reclaiming type amplifier and analog circuit.
Background technology
With the popularization of portable electric appts, market is also more and more urgent to the demand of low-power consumption analog circuit.At present,
A kind of electric current reclaiming type folded common source and common grid amplifier for being operated in saturation region is widely used because of its low-power consumption, the biography
The circuit structure of the electric current reclaiming type folded common source and common grid amplifier of system is as shown in Figure 1, wherein, input stage is by four PMOS tube
M1a, M2a, M1b, M2b are formed；Intergrade is made of two high speed current mirrors, and first high speed current mirror includes 3 NMOS tubes
M11, M3a, M3b, second high speed current mirror include 3 NMOS tubes M12, M4a, M4b, and the work of K times of amplification is played to recycling electric current
With；Output stage is made of NMOS tube M5, M6 and PMOS tube M7, M8, M9, M10.Positive phase input signal will by input pipe M1a
Voltage signal is converted into downward current signal, at the same negative sense input signal by input pipe M2b by voltage signal be converted into
On recycling current signal, which is exaggerated K times by current mirror M11, M3b, M3a of interconnection, with M1a pipes to
Under electric current negative sense output terminal is flowed to by M5 together.
Conventional current reclaiming type folded common source and common grid amplifier has the following disadvantages：The output of the Conventional amplifiers input stage
Electric current is mainly biased the influence for the bias current that circuit produces, and for low-power consumption analog circuit environment, by power consumption limit, this is inclined
Put that electric current is smaller, thus cause the size of the output current also restrained；Secondly, Conventional amplifiers can only Linear Amplifer electricity
Stream, can not bigger amplification electric current.2 points of gain bandwidth products for having resulted in amplifier of the above and slew rate are unable to reach larger
Value, so as to limit achievable maximum current efficiency.
The content of the invention
In view of this, it is an object of the invention to provide a kind of electric current reclaiming type amplifier and analog circuit, so that amplification
Device increases the output current of input stage in the case where keeping low-power consumption, and allows amplification of the amplifier into biquadratic times
Differential input signal, so as to greatly improve the gain bandwidth product and slew rate of amplifier, effective boost amplifier is achievable most
High current efficiency.
In a first aspect, an embodiment of the present invention provides a kind of electric current reclaiming type amplifier, including：AB class input stages, with AB
The common-mode feedback intergrade that class input stage is electrically connected, is electrically connected rail-to-rail with AB classes input stage and common-mode feedback intergrade
Output stage；AB classes input stage includes turnover voltage follower, bias current sources, the first Differential Input pair and the second Differential Input
It is right, it is supplied to common-mode feedback intergrade for input voltage signal to be converted into current signal；Two outputs of bias current sources
End is connected by the first tie point and the second tie point with turnover voltage follower respectively；Turnover voltage follower connects by the 3rd
Contact with the first Differential Input to being connected, by the 4th tie point with the second Differential Input to being connected；First Differential Input pair
Input terminal connection positive input voltage Vin+；The input terminal connection reverse inter-input-ing voltage Vin- of second Differential Input pair；Common mode is anti-
Presenting intergrade includes local common mode feedback circuit, for being supplied to rail-to-rail output stage after current signal is amplified；Local common mode
Feedback circuit is connected by the 5th tie point and the 6th tie point with rail-to-rail output stage；Local common mode feedback circuit passes through the 7th
Tie point and the 8th tie point are connected with AB class input stages；Rail-to-rail output stage is used to amplified current signal being converted into electricity
Pressure signal simultaneously exports；The output terminal of rail-to-rail output stage is connected to output voltage Vout.
With reference to first aspect, an embodiment of the present invention provides the first possible embodiment of first aspect, wherein, turn over
Turning voltage follower includes the first turnover voltage follower and the second turnover voltage follower；First turnover voltage follower includes
Transistor M0a, M2c；Second turnover voltage follower includes transistor M0b, M1c；The source electrode of transistor M0a and the first level are believed
Number VDD is connected, and drain electrode is connected with the 3rd tie point, and grid is connected with the first tie point；The source electrode of transistor M2c is connected with the 3rd
Point is connected, and drain electrode is connected with the first tie point, and grid is connected with reverse inter-input-ing voltage Vin-；The source electrode of transistor M0b, drain electrode,
Grid is connected with the first level signal VDD, the 4th tie point, the second tie point respectively；Source electrode, drain electrode, the grid of transistor M1c
It is connected respectively with the 4th tie point, the second tie point, reverse inter-input-ing voltage Vin-.
The possible embodiment of with reference to first aspect the first, an embodiment of the present invention provides second of first aspect
Possible embodiment, wherein, bias current sources include M11a and M11b；The grid of transistor M11a and M11b are all electric with first
Pressure keeps node to be connected；First voltage keeps node to provide fixed voltage Vb1；The source electrode of transistor M11a and M11b are all with first
Level signal VSS is connected；The drain electrode of transistor M11a is connected with the first tie point；The drain electrode of transistor M11b and the second tie point
It is connected.
Second of possible embodiment with reference to first aspect, an embodiment of the present invention provides the third of first aspect
Possible embodiment, wherein, the first Differential Input is to including transistor M1a and M1b；Second Differential Input is to including transistor
M2a and M2b；The source electrode of transistor M1a, drain electrode, grid respectively with the 3rd tie point, the 5th tie point, positive input voltage Vin
+ be connected；The source electrode of transistor M1b, drain electrode, grid respectively with the 3rd tie point, the 8th tie point, positive input voltage Vin+ phases
Even；Source electrode, drain electrode, the grid of transistor M2a is connected with the 4th tie point, the 6th tie point, reverse inter-input-ing voltage Vin- respectively；
Source electrode, drain electrode, the grid of transistor M2b is connected with the 4th tie point, the 7th tie point, reverse inter-input-ing voltage Vin- respectively.
The third possible embodiment with reference to first aspect, an embodiment of the present invention provides the 4th kind of first aspect
Possible embodiment, wherein, local common mode feedback circuit includes transistor M3a, M3b, M4a, M4b and resistance R1, R2；It is brilliant
The source electrode of body pipe M3a, M3b, M4a, M4b are all connected with the first level signal VSS；The drain electrode of transistor M3a, grid are respectively with
Five tie points, the 7th tie point are connected；The grid of transistor M3b, M4b are all connected with the 9th tie point；Transistor M3b, M4b's
Drain electrode is connected with the 7th tie point, the 8th tie point respectively；The drain electrode of transistor M4a, grid respectively with the 6th tie point, the 8th
Tie point is connected；The both ends of resistance R1 are connected with the 7th tie point, the 9th tie point respectively；The both ends of resistance R2 are respectively with the 8th
Tie point, the 9th tie point are connected.
The 4th kind of possible embodiment with reference to first aspect, an embodiment of the present invention provides the 5th kind of first aspect
Possible embodiment, wherein, rail-to-rail output stage includes transistor M5, M6, M7, M8, M9, M10 and load capacitance CL；It is brilliant
The grid of body pipe M5, M6 all keep node to be connected with second voltage；Second voltage keeps node to provide fixed voltage Vb2；It is brilliant
Drain electrode of the source electrode, drain electrode of body pipe M5 respectively with the 5th tie point, transistor M7 is connected；The source electrode of transistor M6, drain electrode difference
It is connected with the 6th tie point, output voltage Vout；The grid of transistor M7, M8 all keep node to be connected with tertiary voltage；3rd
Voltage keeps node to provide fixed voltage Vb3；The source electrode of transistor M7 is connected with the drain electrode of transistor M9；The source of transistor M8
Pole, the drain electrode with transistor M10, output voltage Vout are connected respectively for drain electrode；The source electrode of transistor M9, M10 all with the first level
Signal VDD is connected；Drain electrode of the grid of transistor M9, M10 all with transistor M7 is connected.
The 5th kind of possible embodiment with reference to first aspect, an embodiment of the present invention provides the 6th kind of first aspect
Possible embodiment, wherein, resistance R1 is identical with the resistance value of resistance R2.
The 5th kind of possible embodiment with reference to first aspect, an embodiment of the present invention provides the 7th kind of first aspect
Possible embodiment, wherein, transistor M0a, M0b, M1a, M1b, M2a, M2b, M1c, M2c, M7, M8, M9, M10 are
PMOS tube.
The 5th kind of possible embodiment with reference to first aspect, an embodiment of the present invention provides the 8th kind of first aspect
Possible embodiment, wherein, transistor M11a, M11b, M3a, M3b, M4a, M4b, M5, M6 are NMOS tube.
Second aspect, the embodiment of the present invention also provides a kind of analog circuit, including above-mentioned first aspect and its each possibility are in fact
The electric current reclaiming type amplifier of one of mode offer is provided.
The embodiment of the present invention brings following beneficial effect：
Electric current reclaiming type amplifier and analog circuit provided in an embodiment of the present invention, are combined by the input stage in amplifier
Using turnover voltage follower and bias current sources, the output current and external input voltage signal for making amplifier input stage produce
Association, so as to produce big input current；Secondly, by using local common mode feedback circuit in the intergrade of amplifier,
The Linear Amplifer for making amplifier original is transformed into nonlinear biquadratic and amplifies again, thus greatly improves output current.
Other feature and advantage of the disclosure will illustrate in the following description, alternatively, Partial Feature and advantage can be with
Deduce from specification or unambiguously determine, or by implement the disclosure above-mentioned technology it can be learnt that.
To enable the above-mentioned purpose of the disclosure, feature and advantage to become apparent, preferred embodiment cited below particularly, and coordinate
Appended attached drawing, is described in detail below.
Brief description of the drawings
, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution of the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in describing below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
Put, other attached drawings can also be obtained according to these attached drawings.
Fig. 1 is the circuit structure diagram that traditional electric current provided by the invention recycles folded common source and common grid amplifier；
Fig. 2 is the circuit structure diagram of electric current reclaiming type amplifier provided in an embodiment of the present invention；
Fig. 3 is that electric current reclaiming type amplifier provided in an embodiment of the present invention is put with traditional electric current recycling folded common source and common grid
The open loop AC response simulation comparison figure of big device；
Fig. 4 is that electric current reclaiming type amplifier provided in an embodiment of the present invention is put with traditional electric current recycling folded common source and common grid
The big signal transient response simulation comparison figure of big device.
Icon：
100- turnover voltage followers；110- bias current sources；The first Differential Inputs pair of 120-；The second Differential Inputs of 130-
It is right；140- part common mode feedback circuits；The rail-to-rail output stages of 150-.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with attached drawing to the present invention
Technical solution be clearly and completely described, it is clear that described embodiment is part of the embodiment of the present invention, rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Lower all other embodiments obtained, belong to the scope of protection of the invention.
At present, the output current of conventional current reclaiming type folded common source and common grid amplifier input stage is mainly biased that circuit produces
The influence of raw bias current, for low-power consumption analog circuit environment, by power consumption limit, the bias current is smaller, thus causes this
The size of output current is also restrained；Secondly, Conventional amplifiers can only Linear Amplifer electric current, can not bigger amplification electric current.
2 points of gain bandwidth products for having resulted in amplifier of the above and slew rate are unable to reach larger value, so as to limit achievable
Maximum current efficiency.Based on this, a kind of electric current reclaiming type amplifier and analog circuit provided in an embodiment of the present invention, can make to put
Big device increases the output current of input stage in the case where keeping low-power consumption, and allows amplifier putting into biquadratic times
Big differential input signal, so as to greatly improve the gain bandwidth product and slew rate of amplifier, effective boost amplifier is achievable
Maximum current efficiency.
For ease of understanding the present embodiment, a kind of electric current reclaiming type disclosed in the embodiment of the present invention is amplified first
Device describes in detail.
Embodiment 1
An embodiment of the present invention provides a kind of electric current reclaiming type amplifier, the embodiment of the present invention shown in Figure 2 provides
Electric current reclaiming type amplifier circuit structure diagram, the electric current reclaiming type amplifier using CMOS technology realize.
As shown in Fig. 2, the electric current reclaiming type amplifier includes：AB class input stages, the common mode being electrically connected with AB class input stages
Feed back intergrade, the rail-to-rail output stage 150 being electrically connected with AB classes input stage and common-mode feedback intergrade.
Wherein, AB classes input stage includes turnover voltage follower 100, bias current sources 110, the first Differential Input to 120
With the second Differential Input to 130, common-mode feedback intergrade is supplied to for input voltage signal to be converted into current signal；Biasing
Two output terminals of current source 110 are connected by the first tie point A and the second tie point B with turnover voltage follower 100 respectively；
Turnover voltage follower 100 is connected by the 3rd tie point N with the first Differential Input to 120, passes through the 4th tie point M and second
Differential Input is connected to 130；First Differential Input connects positive input voltage Vin+ to 120 input terminal；Second Differential Input
To 130 input terminal connection reverse inter-input-ing voltage Vin-.
In addition, turnover voltage follower 100 includes the first turnover voltage follower 100 and the second turnover voltage follower
100；First turnover voltage follower 100 includes transistor M0a, M2c；Second turnover voltage follower 100 includes transistor
M0b、M1c；The source electrode of transistor M0a is connected with the first level signal VDD, and drain electrode is connected with the 3rd tie point N, grid and first
Tie point A is connected；The source electrode of transistor M2c is connected with the 3rd tie point N, drain electrode be connected with the first tie point A, grid with it is anti-phase
Input voltage vin-be connected；The source electrode of transistor M0b, drain electrode, grid respectively with the first level signal VDD, the 4th tie point M,
Second tie point B is connected；The source electrode of transistor M1c, drain electrode, grid respectively with the 4th tie point M, the second tie point B, anti-phase defeated
Enter voltage Vin- to be connected.
Secondly, bias current sources 110 include M11a and M11b；The grid of transistor M11a and M11b are all protected with first voltage
Serve as a diplomatic envoy and be a little connected；First voltage keeps node to provide fixed voltage Vb1；The source electrode of transistor M11a and M11b all with the first level
Signal VSS is connected；The drain electrode of transistor M11a is connected with the first tie point A；The drain electrode of transistor M11b and the second tie point B phases
Even.
First Differential Input includes transistor M1a and M1b to 120；Second Differential Input to 130 include transistor M2a and
M2b；The source electrode of transistor M1a, drain electrode, grid respectively with the 3rd tie point N, the 5th tie point P, positive input voltage Vin+ phases
Even；The source electrode of transistor M1b, drain electrode, grid respectively with the 3rd tie point N, the 8th tie point Y, positive input voltage Vin+ phases
Even；The source electrode of transistor M2a, drain electrode, grid respectively with the 4th tie point M, the 6th tie point Q, reverse inter-input-ing voltage Vin- phases
Even；The source electrode of transistor M2b, drain electrode, grid respectively with the 4th tie point M, the 7th tie point X, reverse inter-input-ing voltage Vin- phases
Even.
The circuit structure diagram of folded common source and common grid amplifier is recycled for traditional electric current provided by the invention as shown in Figure 1,
The grid connection bias voltage Vb4 of transistor M10, forms the biasing circuit of amplifier input stage；Bias voltage Vb4 passes through crystal
Bias current 2I is produced after pipe M10B, bias current 2IBFlowing into four transistors is respectively：M1a, M1b, M2a, M2b, through dividing
The electric current I that intergrade is inputted after stream is less than bias current 2IB.Bias current 2I is limited by low-power consumptionBIt is smaller, so as to cause defeated
Go out electric current I smallers, this strongly limits the slew rate of amplifier.
In contrast, electric current reclaiming type amplifier provided in an embodiment of the present invention using turnover voltage follower 100 and partially
The combination for putting current source 110 instead of biasing circuit in Conventional amplifiers circuit, and the effect of the combination makes input intergrade
Electric current I is no longer biased electric current 2IBLimitation, and with external input voltage signal Vin produce associate, when input signal Vin increasing
Greatly, the electric current I for inputting intergrade also increases accordingly；Specifically, electric current reclaiming type amplifier provided in an embodiment of the present invention
It inputs square times relation that the electric current I of intergrade is differential input signal Vid, wherein, differential input signal Vid is equal to positive
Input signal subtracts the half of negative input signal difference.
In addition, common-mode feedback intergrade includes local common mode feedback circuit 140, for being supplied to after current signal is amplified
Rail-to-rail output stage 150；Local common mode feedback circuit 140 passes through the 5th tie point P and the 6th tie point Q and rail-to-rail output stage
150 connections；Local common mode feedback circuit 140 is connected by the 7th tie point X and the 8th tie point Y with AB class input stages.
Wherein, local common mode feedback circuit 140 includes transistor M3a, M3b, M4a, M4b and resistance R1, R2；Transistor
The source electrode of M3a, M3b, M4a, M4b are all connected with the first level signal VSS；The drain electrode of transistor M3a, grid connect with the 5th respectively
Contact P, the 7th tie point X are connected；The grid of transistor M3b, M4b are all connected with the 9th tie point Z；Transistor M3b, M4b's
Drain electrode is connected with the 7th tie point X, the 8th tie point Y respectively；The drain electrode of transistor M4a, grid respectively with the 6th tie point Q,
8th tie point Y is connected；The both ends of resistance R1 are connected with the 7th tie point X, the 9th tie point Z respectively；The both ends of resistance R2 point
It is not connected with the 8th tie point Y, the 9th tie point Z.In addition, to make output circuit symmetrical in difference channel, resistance R1 and electricity
The resistance value for hindering R2 is identical.
Folded common source and common grid amplifier is recycled for traditional electric current, as shown in Figure 1, positive phase input signal passes through input pipe
Voltage signal is converted into downward current signal by M1a, while negative input signal is changed voltage signal by input pipe M2b
Into upward recycling current signal, which is exaggerated K times by current mirror M11, M3b, M3a of interconnection, with M1a
Manage downward electric current and negative sense output terminal is flowed to by M5 together.In the Conventional amplifiers, equivalent transconductance (Gm) is (K+1)
Gm1a, slew rate 2KIB/CL.In order to maintain power consumption constant, the value of K is ordinarily selected to 3.Therefore, the increasing of the Conventional amplifiers
Beneficial bandwidth and slew rate are twice and three times of conventional folded common source and common grid with equal-wattage.
In contrast, electric current reclaiming type amplifier provided in an embodiment of the present invention, as shown in Fig. 2, by making in intergrade
With local common mode feedback circuit, make the output current of common-mode feedback intergrade with input the intergrade electric current into square times closing
System, that is, the relation of the electric current of output common mode feedback intergrade and the differential input signal of input amplifier into biquadratic again, from
And drastically increase output current.
In addition, rail-to-rail output stage 150 is used to amplified current signal is converted into voltage signal and is exported；It is rail-to-rail
The output terminal of output stage 150 is connected to output voltage Vout.
Wherein, rail-to-rail output stage 150 includes transistor M5, M6, M7, M8, M9, M10 and load capacitance CL；Transistor
The grid of M5, M6 all keep node to be connected with second voltage；Second voltage keeps node to provide fixed voltage Vb2；Transistor
Drain electrode of the source electrode, drain electrode of M5 respectively with the 5th tie point P, transistor M7 is connected；The source electrode of transistor M6, drain electrode are respectively with the
Six tie point Q, output voltage Vout are connected；The grid of transistor M7, M8 all keep node to be connected with tertiary voltage；Tertiary voltage
Node is kept to provide fixed voltage Vb3；The source electrode of transistor M7 is connected with the drain electrode of transistor M9；The source electrode of transistor M8,
The drain electrode with transistor M10, output voltage Vout are connected respectively for drain electrode；The source electrode of transistor M9, M10 all with the first level signal
VDD is connected；Drain electrode of the grid of transistor M9, M10 all with transistor M7 is connected.
Meanwhile in above-mentioned each module, transistor M0a, M0b, M1a, M1b, M2a, M2b, M1c, M2c, M7, M8, M9,
M10 is PMOS tube；Transistor M11a, M11b, M3a, M3b, M4a, M4b, M5, M6 are NMOS tube.
Electric current reclaiming type amplifier provided in an embodiment of the present invention, by the way that upset electricity is applied in combination in the input stage of amplifier
Follower and bias current sources are pressed, the output current of amplifier input stage is produced with external input voltage signal and associates, so that
Big input current can be produced；Secondly, by using local common mode feedback circuit in the intergrade of amplifier, make amplifier former
The Linear Amplifer come is transformed into nonlinear biquadratic and amplifies again, thus greatly improves output current.
In order to test the performance of electric current reclaiming type amplifier provided in an embodiment of the present invention, set in CMOS180nm techniques
Count and simulate two amplifiers：Traditional electric current recycling folded common source and common grid amplifier RFC (Recycling folded
Cascode amplifier) and electric current reclaiming type amplifier SRFC (Super-recycling provided in an embodiment of the present invention
folded cascode amplifier).Supply voltage is 1.8V, load capacitance 30.0pF, by board design, final R1
With the value selected as 20K Ω of R2.The bias current I of the Differential Input pair of two amplifiersBIt is arranged to 10 μ A.
Fig. 3 is the open loop AC response simulation comparison figure of SRFC and RFC, as shown in figure 3, the gain bandwidth product GBW of SRFC
The value of (Gain-bandwidth product) is 15.7MHz, adds 310% compared to RFC, power adds 25%.Separately
Outside, since the raising of mutual conductance performance, the DC current gain of SRFC also increase 12dB compared to RFC.
The big signal transient that Fig. 4 is SRFC and RFC responds simulation comparison figure, wherein, frequency is the 0.6Vpp's of 0.5MHz
Big step signal is applied to above-mentioned two amplifier.As shown in figure 4, the average slew rate of SRFC is 11.2V/us, increase than RFC
Add 830%.In addition, the sign of ring does not occur yet in the step response of SRFC, this shows that SRFC is kept in degeneration factor
In the case of stabilization, slew rate has obtained great lifting.
Embodiment 2
An embodiment of the present invention provides a kind of analog circuit, including the electric current reclaiming type amplifier that above-described embodiment provides.
The electric current reclaiming type amplifier is used to gather signal in the analog circuit and signal is handled.The analog circuit can be wide
It is general to be applied to the fields such as consumer electronics product, computer, communication, automobile.
Analog circuit provided in an embodiment of the present invention, has identical with the electric current reclaiming type amplifier that above-described embodiment provides
Technical characteristic, so can also solve identical technical problem, reach identical technique effect.
In addition, in the description of the embodiment of the present invention, unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；Can
To be mechanical connection or be electrically connected；It can be directly connected, can also be indirectly connected by intermediary, Ke Yishi
Connection inside two elements.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this
Concrete meaning in invention.
In the description of the present invention, it is necessary to explanation, term " " center ", " on ", " under ", "left", "right", " vertical ",
The orientation or position relationship of the instruction such as " level ", " interior ", " outer " be based on orientation shown in the drawings or position relationship, merely to
Easy to describe the present invention and simplify description, rather than instruction or imply signified device or element must have specific orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.In addition, term " first ", " second ",
" the 3rd " is only used for description purpose, and it is not intended that instruction or hint relative importance.
Finally it should be noted that：Embodiment described above, is only the embodiment of the present invention, to illustrate the present invention
Technical solution, rather than its limitations, protection scope of the present invention is not limited thereto, although with reference to the foregoing embodiments to this hair
It is bright to be described in detail, it will be understood by those of ordinary skill in the art that：Any one skilled in the art
The invention discloses technical scope in, it can still modify the technical solution described in previous embodiment or can be light
It is readily conceivable that change, or equivalent substitution is carried out to which part technical characteristic；And these modifications, change or replacement, do not make
The essence of appropriate technical solution departs from the spirit and scope of technical solution of the embodiment of the present invention, should all cover the protection in the present invention
Within the scope of.Therefore, protection scope of the present invention answers the scope of the claims of being subject to.
Claims (10)
- A kind of 1. electric current reclaiming type amplifier, it is characterised in that including：AB class input stages, are electrically connected with the AB classes input stage Common-mode feedback intergrade, the rail-to-rail output being electrically connected with the AB classes input stage and the common-mode feedback intergrade Level；The AB classes input stage includes turnover voltage follower, bias current sources, the first Differential Input pair and the second Differential Input It is right, it is supplied to the common-mode feedback intergrade for input voltage signal to be converted into current signal；The bias current sources Two output terminals are connected by the first tie point and the second tie point with the turnover voltage follower respectively；The turnover voltage Follower by the 3rd tie point with first Differential Input to being connected, pass through the 4th tie point and second Differential Input To connection；The input terminal connection positive input voltage Vin+ of first Differential Input pair；Second Differential Input pair it is defeated Enter end connection reverse inter-input-ing voltage Vin-；The common-mode feedback intergrade includes local common mode feedback circuit, described for being supplied to after the current signal is amplified Rail-to-rail output stage；The part common mode feedback circuit passes through the 5th tie point and the 6th tie point and the rail-to-rail output stage Connection；The part common mode feedback circuit is connected by the 7th tie point and the 8th tie point with the AB classes input stage；The rail-to-rail output stage is used to the amplified current signal is converted into voltage signal and is exported；It is described rail-to-rail The output terminal of output stage is connected to output voltage Vout.
- 2. electric current reclaiming type amplifier according to claim 1, it is characterised in that the turnover voltage follower includes the One turnover voltage follower and the second turnover voltage follower；The first turnover voltage follower includes transistor M0a, M2c； The second turnover voltage follower includes transistor M0b, M1c；The source electrode of the transistor M0a is connected with the first level signal, drain electrode be connected with the 3rd tie point, grid with it is described First tie point is connected；The source electrode of the transistor M2c is connected with the 3rd tie point, and drain electrode is connected with first tie point, grid and institute Reverse inter-input-ing voltage Vin- is stated to be connected；The source electrode of the transistor M0b, drain electrode, grid respectively with first level signal, the 4th tie point, described Two tie points are connected；The source electrode of the transistor M1c, drain electrode, grid respectively with the 4th tie point, second tie point, described anti-phase Input voltage vin-be connected.
- 3. electric current reclaiming type amplifier according to claim 2, it is characterised in that the bias current sources include M11a and M11b；The grid of the transistor M11a and M11b all keeps node to be connected with first voltage；The first voltage keeps node to carry For fixed voltage Vb1；The source electrode of the transistor M11a and M11b is all connected with second electrical level signal；The drain electrode of the transistor M11a is connected with first tie point；The drain electrode of the transistor M11b connects with described second Contact is connected.
- 4. electric current reclaiming type amplifier according to claim 3, it is characterised in that first Differential Input is to including crystalline substance Body pipe M1a and M1b；Second Differential Input is to including transistor M2a and M2b；The source electrode of the transistor M1a, drain electrode, grid respectively with the 3rd tie point, the 5th tie point, the positive Input voltage vin+be connected；The source electrode of the transistor M1b, drain electrode, grid respectively with the 3rd tie point, the 8th tie point, the positive Input voltage vin+be connected；The source electrode of the transistor M2a, drain electrode, grid respectively with the 4th tie point, the 6th tie point, described anti-phase Input voltage vin-be connected；The source electrode of the transistor M2b, drain electrode, grid respectively with the 4th tie point, the 7th tie point, described anti-phase Input voltage vin-be connected.
- 5. electric current reclaiming type amplifier according to claim 4, it is characterised in that the part common mode feedback circuit includes Transistor M3a, M3b, M4a, M4b and resistance R1, R2；The source electrode of described transistor M3a, M3b, M4a, M4b are all connected with the second electrical level signal；The drain electrode of the transistor M3a, grid are connected with the 5th tie point, the 7th tie point respectively；The grid of described transistor M3b, M4b are all connected with the 9th tie point；The drain electrode of described transistor M3b, M4b are connected with the 7th tie point, the 8th tie point respectively；The drain electrode of the transistor M4a, grid are connected with the 6th tie point, the 8th tie point respectively；The both ends of the resistance R1 are connected with the 7th tie point, the 9th tie point respectively；The both ends of the resistance R2 are connected with the 8th tie point, the 9th tie point respectively.
- 6. electric current reclaiming type amplifier according to claim 5, it is characterised in that the rail-to-rail output stage includes crystal Pipe M5, M6, M7, M8, M9, M10 and load capacitance CL；The grid of described transistor M5, M6 all keep node to be connected with second voltage；It is solid that the second voltage keeps node to provide Fixed voltage Vb2；Drain electrode of the source electrode, drain electrode of the transistor M5 respectively with the 5th tie point, the transistor M7 is connected；The crystalline substance The source electrode of body pipe M6, drain electrode are connected with the 6th tie point, the output voltage Vout respectively；The grid of described transistor M7, M8 all keep node to be connected with tertiary voltage；It is solid that the tertiary voltage keeps node to provide Fixed voltage Vb3；The source electrode of the transistor M7 is connected with the drain electrode of the transistor M9；The source electrode of the transistor M8, drain electrode respectively with The draining of the transistor M10, the output voltage Vout is connected；The source electrode of described transistor M9, M10 are all connected with first level signal；Drain electrode of the grid of described transistor M9, M10 all with the transistor M7 is connected.
- 7. electric current reclaiming type amplifier according to claim 6, it is characterised in that the resistance R1 and resistance R2's Resistance value is identical.
- 8. electric current reclaiming type amplifier according to claim 6, it is characterised in that the transistor M0a, M0b, M1a, M1b, M2a, M2b, M1c, M2c, M7, M8, M9, M10 are PMOS tube.
- 9. electric current reclaiming type amplifier according to claim 6, it is characterised in that the transistor M11a, M11b, M3a, M3b, M4a, M4b, M5, M6 are NMOS tube.
- 10. a kind of analog circuit, it is characterised in that including claim 1-9 any one of them electric current reclaiming type amplifiers.
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| CN111431489A (en) * | 2020-04-20 | 2020-07-17 | 北京昂瑞微电子技术有限公司 | Common mode feedback circuit and differential amplifier |
| CN113422585A (en) * | 2021-07-06 | 2021-09-21 | 东南大学 | High dynamic input range instrumentation amplifier |
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Application publication date: 20180427 |