CN104242839B - Programmable fully differential gain bootstrap trsanscondutance amplifier - Google Patents
Programmable fully differential gain bootstrap trsanscondutance amplifier Download PDFInfo
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- CN104242839B CN104242839B CN201310283082.0A CN201310283082A CN104242839B CN 104242839 B CN104242839 B CN 104242839B CN 201310283082 A CN201310283082 A CN 201310283082A CN 104242839 B CN104242839 B CN 104242839B
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Abstract
The invention provides a kind of programmable fully differential gain bootstrap trsanscondutance amplifier, including：Preposition pre-amplification circuit, amplify differential input signal, export the differential input signal after pre-amplification；The telescopic gain bootstrap amplifying circuit of rear class, amplify the output signal of the preposition pre-amplification circuit, form differential output signal；Bandwidth programmed circuit, for the programming control signal according to outside input, adjust the bandwidth of preposition pre-amplification circuit and the bandwidth of the telescopic gain bootstrap amplifying circuit of rear class；Output common mode feedback circuit, for according to the differential output signal, to the telescopic gain bootstrap amplifying circuit input common mode feedback signal of rear class, and causing the differential output signal of rear class sleeve self-tuning gain output common mode level within a predetermined range；The multiplication factor of preposition pre-amplification circuit is less than the multiplication factor of the telescopic gain bootstrap amplifying circuit of rear class.The present invention can realize that bandwidth increases and with programming regulation and control amount of bandwidth function.
Description
Technical field
The present invention relates to a kind of programmable fully differential trsanscondutance amplifier, and in particular to a kind of with bandwidth programmable functions
Fully differential gain bootstrap trsanscondutance amplifier.
Background technology
Trsanscondutance amplifier is that input difference voltage signal is converted into current signal, and carrying out discharge and recharge to capacitive load comes in fact
Now it is input to the functional module of output voltage method.Important composition list of the amplifier as assembly line A/D (analog) converter
Member, its performance have important influence to pipeline a/d converter.As pipeline a/d converter is to high-speed, high precision direction
Development, gain and bandwidth requirement more and more higher to its internal subcircuits, particularly amplifier.In pipeline a/d converter
In MDAC (multiplying digital-to-analog converter), internal multiple comparators need this grade of input analog voltage signal to change into follow-up electricity
Logic level needed for road, then logic level signal is converted into by analog voltage signal by D/A (D/A) converters, finally
Realize that subtraction obtains level production line after remaining difference signal supplies and continued with by the enlarging function of amplifier.Ordinary circumstance
Under, the closed-loop bandwidth of amplifier determines the speed of establishing of its output signal, and which also limits whole pipeline a/d converter
Speed.
Existing amplifier architecture includes：Single-stage sleeve/folding amplifier, two-stage miller compensation amplifier and one pass gain
Bootstrap amplifier.Wherein, single-stage sleeve/folding amplifier open-loop gain is not big enough, it is difficult to reaches streamline required precision；And two
In level miller compensation amplifier, there is quite a few power consumption to be used for doing frequency compensation, it is relatively low in power consumption utilization ratio；So one
As high-gain realized using one pass gain bootstrap amplifier.
But at least there are the following problems for existing one pass gain bootstrap amplifier technology：The band of one pass gain bootstrap amplifier
It is wide smaller, it is impossible to meet requirement of the high-speed AD converter structure to amplifier speed instantly；And general one pass gain bootstrapping
Amplifier only has fixed-bandwidth, for the application environment and technique, temperature, power supply drift of complexity, it is difficult to meet different speed
Degree and stability requirement；Meanwhile input range to be also present smaller for one pass gain bootstrap amplifier, input parasitic capacitance is larger to wait meeting
The shortcomings that deteriorating data converter performance；These problems limit CMOS (Complementary Metal Oxide
Semiconductor), complementary metal oxide semiconductor) one pass gain bootstrap amplifier is in A/D converter with high speed and high precision
In application.
The content of the invention
, can while high-gain is ensured the invention provides a kind of programmable fully differential gain bootstrap trsanscondutance amplifier
To realize that bandwidth increases and with programming regulation and control amount of bandwidth function.
Compared with prior art, the invention provides a kind of programmable fully differential gain bootstrap trsanscondutance amplifier, including：
Preposition pre-amplification circuit, for amplifying differential input signal, export the differential input signal after pre-amplification；
The telescopic gain bootstrap amplifying circuit of rear class, for amplifying the output signal of the preposition pre-amplification circuit, formed
Differential output signal；
Bandwidth programmed circuit, for the programming control signal according to outside input, adjust the preposition pre-amplification circuit
The bandwidth of bandwidth and the telescopic gain bootstrap amplifying circuit of the rear class；
Output common mode feedback circuit, for according to the differential output signal, being put to the telescopic gain bootstrap of the rear class
Big circuit input common mode feedback signal, and cause the telescopic gain bootstrap amplifying circuit output common mode level of rear class predetermined
In the range of differential output signal；
The multiplication factor of the preposition pre-amplification circuit is less than the amplification of the telescopic gain bootstrap amplifying circuit of the rear class
Multiple.
During implementation, positive output end and the telescopic gain bootstrap amplifying circuit of the rear class of the preposition pre-amplification circuit
Normal phase input end be connected；The reversed-phase output of preposition pre-amplification circuit gain bootstrap amplification electricity telescopic with the rear class
The inverting input on road is connected；
The positive output end of the telescopic gain bootstrap amplifying circuit of rear class and positive signal load and the output
The positive output test side connection of common mode feedback circuit；The reversed-phase output of the telescopic gain bootstrap amplifying circuit of rear class with
Inversion signal loads and the connection of the anti-phase output test side of the output common mode feedback circuit；
The output common mode feedback signal of output common mode feedback circuit gain bootstrap amplification electricity telescopic with the rear class
The common-mode feedback point connection on road；
The normal phase input end of preposition pre-amplification circuit described in the positive phase input signal input of fully differential input signal, it is complete poor
Divide the inverting input of the described preposition pre-amplification circuit of the rp input signal input of input signal.
During implementation, the preposition pre-amplification circuit and the telescopic gain bootstrap amplifying circuit of the rear class are fully differential knot
Structure.
During implementation, the preposition pre-amplification circuit includes：
First bias current sources, for providing bias current；
Positive input transistor, grid access positive input voltage, source electrode are grounded by first bias current sources, and drain electrode is logical
The high level output end for crossing positive variable load network and driving power connects, and source electrode is anti-phase defeated for the preposition pre-amplification circuit
Go out end；
Negative input transistor, grid access negative input voltage, source electrode are grounded by first bias current sources, and drain electrode is logical
The high level output end for crossing negative variable load network and driving power connects, and drains defeated for the positive of the preposition pre-amplification circuit
Go out end；
The gain of the positive variable load network and the gain of the negative variable load network are controlled by the analog programming
Signal controls.
During implementation, the positive variable load network includes multiple load circuits in parallel；
The negative variable load network includes multiple load circuits in parallel；
Each load circuit includes the passive resistance and load transistor being sequentially connected in series.
During implementation, the telescopic gain bootstrap amplifying circuit of rear class includes：
First rear class input transistors, grid are connected with the positive output end of the preposition pre-amplification circuit, and source electrode passes through
Second bias current sources are grounded, and drain electrode is put by the first gain bootstrap feedback amplifier and the telescopic gain bootstrap of the rear class
The reversed-phase output connection of big circuit；
Second rear class input transistors, grid are connected with the reversed-phase output of the preposition pre-amplification circuit, and source electrode passes through
3rd bias current sources are grounded, and drain electrode is put by the second gain bootstrap feedback amplifier and the telescopic gain bootstrap of the rear class
The positive output end connection of big circuit；
It is connected between the source electrode of the source electrode of the first rear class input transistors and the second rear class input transistors
The variable resistor controlled by the bandwidth programmed circuit；
The reversed-phase output of the telescopic gain bootstrap amplifying circuit of rear class, passes through the 3rd gain bootstrap being sequentially connected
Feedback amplifier and the first load bias current sources, are connected with the high level output end of driving power；
The positive output end of the telescopic gain bootstrap amplifying circuit of rear class, passes through the 4th gain bootstrap being sequentially connected
Feedback amplifier and the second load bias current sources, are connected with the high level output end of driving power.
During implementation, the first gain bootstrap feedback amplifier includes the first gain bootstrap nmos pass transistor and first and increased
Benefit bootstrapping booster amplifier；
The second gain bootstrap feedback amplifier includes the second gain bootstrap nmos pass transistor and the second gain bootstrap
Booster amplifier；
The first gain bootstrap booster amplifier, the source electrode of input and the first gain bootstrap nmos pass transistor connect
Connect, output end is connected with the grid of the first gain bootstrap nmos pass transistor；
The second gain bootstrap booster amplifier, the source electrode of input and the second gain bootstrap nmos pass transistor connect
Connect, output end is connected with the grid of the second gain bootstrap nmos pass transistor；
The first gain bootstrap nmos pass transistor and the second gain bootstrap nmos pass transistor are common bank tube.
During implementation, the 3rd gain bootstrap feedback amplifier includes the first gain bootstrap PMOS and the 3rd gain certainly
Lift booster amplifier；
The 4th gain bootstrap feedback amplifier includes the second gain bootstrap PMOS and the 4th gain bootstrap aids in
Amplifier；
3rd gain bootstrap booster amplifier, input are connected with the source electrode of the first gain bootstrap PMOS, output end with
The grid connection of first gain bootstrap PMOS；
4th gain bootstrap booster amplifier, input are connected with the source electrode of the second gain bootstrap PMOS, output end with
The grid connection of second gain bootstrap PMOS；
The first gain bootstrap PMOS and the second gain bootstrap PMOS are common bank tube.
During implementation, the first gain bootstrap booster amplifier, the second gain bootstrap booster amplifier, the described 3rd
Gain bootstrap booster amplifier and the 4th gain bootstrap booster amplifier include the source follower being sequentially connected and are total to respectively
The one-stage amplifier of source class；
The source follower is used to the signal for inputting the source follower carrying out level shift；
The one-stage amplifier of the common-source stage is used for the signal for inputting the source follower after amplification level shifts and output.
During implementation, the output common mode feedback circuit includes the switched capacitor network of SECO；
The switched capacitor network, it is refreshed, and is used for according to the differential output signal when resetting, to the rear class
Telescopic gain bootstrap amplifying circuit inputs common mode feedback signal, and make it that the telescopic gain bootstrap amplifying circuit of rear class is defeated
Go out the differential output signal of common mode electrical level within a predetermined range.
Compared with prior art, programmable fully differential gain bootstrap trsanscondutance amplifier of the present invention, have bandwidth can
Programing function, by preposition pre-amplification circuit and the telescopic gain bootstrap amplifying circuit of rear class use Bandwidth adjustment technology and
Adaptive-bandwidth programmed circuit, while high-gain is ensured, it is possible to achieve bandwidth increases and with programming regulation and control amount of bandwidth
Function, with realize programmable fully differential gain bootstrap trsanscondutance amplifier different application environments be issued to different stability and
Speed ability；Increase programmable fully differential gain bootstrap trsanscondutance amplifier input range simultaneously, and reduce programmable fully differential and increase
The input parasitic capacitance of benefit bootstrapping trsanscondutance amplifier improves programmable fully differential gain bootstrap trsanscondutance amplifier performance, can be very
Good meets the needs of high-precision adc design.
Brief description of the drawings
Fig. 1 is the structured flowchart of the programmable fully differential gain bootstrap trsanscondutance amplifier described in the embodiment of the present invention；
Fig. 2 is the preposition pre-amplification circuit of the programmable fully differential gain bootstrap trsanscondutance amplifier described in the embodiment of the present invention
Specific embodiment circuit diagram；
Fig. 3 is the telescopic gain of rear class of the programmable fully differential gain bootstrap trsanscondutance amplifier described in the embodiment of the present invention
The circuit diagram of the specific embodiment of bootstrapping amplifying circuit；
Fig. 3 A are the telescopic increasings of rear class of the programmable fully differential gain bootstrap trsanscondutance amplifier described in the embodiment of the present invention
The circuit diagram of the variable resistor R5 of benefit bootstrapping amplifying circuit specific embodiment；
Fig. 4 A are the telescopic increasings of rear class of the programmable fully differential gain bootstrap trsanscondutance amplifier described in the embodiment of the present invention
The circuit diagram of the 3rd described gain bootstrap feedback amplifier P1 of benefit bootstrapping amplifying circuit specific embodiment；
Fig. 4 B are the telescopic increasings of rear class of the programmable fully differential gain bootstrap trsanscondutance amplifier described in the embodiment of the present invention
The circuit diagram of the first described gain bootstrap feedback amplifier N1 of benefit bootstrapping amplifying circuit specific embodiment；
Fig. 5 A are the bandwidth programmed circuits of the programmable fully differential gain bootstrap trsanscondutance amplifier described in the embodiment of the present invention
Selector schematic diagram；
Fig. 5 B are the bandwidth programmed circuits of the programmable fully differential gain bootstrap trsanscondutance amplifier described in the embodiment of the present invention
Bandwidth programming unit circuit diagram；
Fig. 5 C are the bandwidth programmed circuits of the programmable fully differential gain bootstrap trsanscondutance amplifier described in the embodiment of the present invention
Bandwidth programming unit the first reference current source 521 circuit diagram；
Fig. 6 is the output common mode feedback electricity of the programmable fully differential gain bootstrap trsanscondutance amplifier described in the embodiment of the present invention
The circuit diagram on road；
Fig. 6 A are the first clock signal clk and second clock signal CLKB timing diagram.
Embodiment
To cause the object, technical solutions and advantages of the present invention are expressed must be more clearly understood, below in conjunction with the accompanying drawings and have
Body embodiment is further described in detail again to the present invention.
The mode of the specific implementation of the present invention is not limited only to following description, is subject to further instruction in conjunction with accompanying drawing.
It is applied to being compiled with bandwidth for high-speed high-precision flow line A/D (analog) converter the invention provides a kind of
Cheng Gongneng fully differential gain bootstrap trsanscondutance amplifier, it can realize that bandwidth increases and with programming under different application environment
Regulate and control the function of amount of bandwidth.
Programmable fully differential gain bootstrap trsanscondutance amplifier of the present invention is while high-gain is ensured, it is possible to achieve
Bandwidth increases and with programming regulation and control amount of bandwidth function, to realize amplifier different stability and speed ability；Simultaneously
Increase amplifier input range, and reduce the input parasitic capacitance of amplifier to improve amplifier performance.
As shown in figure 1, the programmable fully differential gain bootstrap trsanscondutance amplifier described in the embodiment of the present invention, including it is preposition pre-
The telescopic gain bootstrap amplifying circuit 12 of amplifying circuit 11, rear class, bandwidth programmed circuit 13 and output common mode feedback circuit 14, its
In,
The preposition pre-amplification circuit 11, for amplifying differential input signal, output and the differential input signal after amplification,
To increase the bandwidth of programmable fully differential gain bootstrap trsanscondutance amplifier；
The telescopic gain bootstrap amplifying circuit 12 of rear class, the output for amplifying the preposition pre-amplification circuit 11 are believed
Number, differential output signal is formed, to increase the gain of programmable fully differential gain bootstrap trsanscondutance amplifier；
The multiplication factor of the preposition pre-amplification circuit 11 is less than the telescopic gain bootstrap amplifying circuit 12 of the rear class
Multiplication factor；
The bandwidth programmed circuit 13, for the programming control signal according to outside input, adjust the preposition pre-amplification
The bandwidth of the bandwidth of circuit 11 and the telescopic gain bootstrap amplifying circuit 12 of the rear class, to realize bandwidth programing function；
The output common mode feedback circuit 14, for according to the differential output signal, to the telescopic gain of the rear class
Amplifying circuit 12 of booting inputs common mode feedback signal, and causes the telescopic output common mode of gain bootstrap amplifying circuit 12 of rear class
The differential output signal of level within a predetermined range so that will not be because of technique during programmable fully differential programming amplifier operation
Cause output common mode level deviation too big with problem, ensure that programmable fully differential programming amplifier being capable of normal work.
Preferably, the preposition pre-amplification circuit 11 using less gain come pre-amplification differential input signal, the band
The gain of preposition pre-amplification circuit 13 under the regulation of wide programing circuit 13 is 1.9 and 2.7 so as to the telescopic gain of the rear class
The bandwidth of bootstrapping amplifying circuit 12 improves, can so as to improve the bandwidth of programmable fully differential gain bootstrap trsanscondutance amplifier
Meet the requirement of A/D converter with high speed and high precision design well.
According to a kind of embodiment, positive output end and the telescopic increasing of the rear class of the preposition pre-amplification circuit
The normal phase input end of benefit bootstrapping amplifying circuit is connected；The reversed-phase output of the preposition pre-amplification circuit and the rear class are telescopic
The inverting input of gain bootstrap amplifying circuit is connected；
The positive output end of the telescopic gain bootstrap amplifying circuit of rear class and the programmable fully differential gain bootstrap
The positive signal load and the positive output test side connection of the output common mode feedback circuit that trsanscondutance amplifier to be driven；Institute
The reversed-phase output for the telescopic gain bootstrap amplifying circuit of rear class stated amplifies with the programmable fully differential gain bootstrap mutual conductance
The inversion signal load and the anti-phase output test side connection of the output common mode feedback circuit that device to be driven；
The output common mode feedback signal of output common mode feedback circuit gain bootstrap amplification electricity telescopic with the rear class
The common-mode feedback point connection on road；
The digital controlled signal of outside input is converted into analog signal by described bandwidth programmed circuit, described so as to control
The variable load network of preposition pre-amplification circuit and the variable resistor of the telescopic gain bootstrap amplifying circuit of rear class, it is whole to realize
The band wide programing of body amplifier；
The normal phase input end of preposition pre-amplification circuit described in the positive phase input signal input of fully differential input signal, it is complete poor
Divide the inverting input of the described preposition pre-amplification circuit of the rp input signal input of input signal.
As shown in Fig. 2 according to a kind of embodiment, the preposition pre-amplification circuit includes：
First bias current sources 21, for providing bias current；
Positive input transistor MN1, grid access positive input voltage Vip, source electrode are connect by first bias current sources 21
Ground terminal GND, drain electrode are connected by positive variable load network 221 with the high level output end VDD of driving power, before source electrode is described
Put the reversed-phase output VN of pre-amplification circuit；
Negative input transistor MN2, grid access negative input voltage Vin, source electrode are connect by first bias current sources 21
Ground terminal GND, drain and be connected by negative variable load network 222 with the high level output end VDD of driving power, drain as before described
Put the positive output end VP of pre-amplification circuit；
The gain of the positive variable load network 221 and the gain of the negative variable load network 222 are by analog programming control
Signal control processed；
The positive variable load network 221 includes multiple load circuits in parallel；
The negative variable load network 222 includes multiple load circuits in parallel；
Each load circuit includes the passive resistance and load transistor being sequentially connected in series；
The passive resistance is connected with the load transistor, to increase output impedance, increases the preposition pre-amplification
The gain of circuit, and then increase the bandwidth of programmable fully differential gain bootstrap trsanscondutance amplifier；
The variable load network 22 can effectively significantly alter the gain of the preposition pre-amplification circuit 21, so as to realize
The band broad tuning function of programmable fully differential gain bootstrap trsanscondutance amplifier.
In fig. 2, Vb1 is the first offset signal, and Vb2 is the second offset signal.
Specifically, as shown in Fig. 2 first bias current sources 21 use the first bias current NMOS (N-Mental-
Oxide-Semiconductor, N-type Metal-oxide-semicondutor) pipe MN3；
MN3, grid access the second offset signal Vb2, source ground end GND, drain electrode respectively with the positive input transistor
MN1 drain electrode connects with the drain electrode of the negative input transistor MN2；
The positive input transistor MN1 and negative input transistor MN2 is nmos pass transistor；
The negative variable load network 222 includes the first passive resistance R1, the first load NMOS transistor MN4, the second nothing
Source resistance R2 and the second load NMOS transistor MN5, wherein,
R1, one end are connected with the positive output end VP of the preposition pre-amplification circuit, the other end and MN4 source electrode connection；
MN4, grid access the first analog programming control signal Vcon1, drain electrode and the high level output end VDD of driving power
Connection；
R2, one end are connected with the positive output end VP of the preposition pre-amplification circuit, the other end and MN5 source electrode connection；
MN5, grid access the first offset signal Vb1, and drain electrode is connected with the high level output end VDD of driving power；
The positive variable load network 221 includes the 3rd passive resistance R3, the 3rd load NMOS transistor MN6, the 4th nothing
Source resistance R4 and the 4th load NMOS transistor MN7, wherein,
R3, one end are connected with the negative output end VN of the preposition pre-amplification circuit, the other end and MN6 source electrode connection；
MN6, grid access the first offset signal Vb1, and drain electrode is connected with the high level output end VDD of driving power；
R2, one end are connected with the positive output end VP of the preposition pre-amplification circuit, the other end and MN7 source electrode connection；
MN7, grid access the first analog programming control signal Vcon1, drain electrode and the high level output end VDD of driving power
Connection；
R1, R2, R3, R4 are the series resistances in the load path of the preposition pre-amplification circuit, are carried using passive resistance
High programming Control is to variable load network-based control precision；
When the first analog programming control signal Vcon1 is changed into Vb1 by external programming control, preposition pre-amplification circuit gain
For 1.9, when the first analog programming control signal Vcon1 is changed into 0 by external programming control, preposition pre-amplification circuit gain is
2.7 so that programmable fully differential gain bootstrap trsanscondutance amplifier bandwidth adjustment scope is larger, realizes to may be programmed fully differential gain
The band broad tuning function of bootstrapping trsanscondutance amplifier.
The telescopic gain bootstrap amplifying circuit of rear class realizes larger gain, further amplifies the preposition pre-amplification
The output signal of circuit, its open-loop gain representative value is preferably 50000 or so, and larger open-loop gain ensure that amplifier is closing
Closed-loop precision under ring working condition, meet the requirement under high-precision applications for amplifier.
As shown in figure 3, the telescopic gain bootstrap amplifying circuit of rear class includes：
First rear class input transistors MN8, grid are connected with the positive output end VP of the preposition pre-amplification circuit, source electrode
By the earth terminal GND of the second bias current sources 31, drain electrode passes through the first gain bootstrap feedback amplifier 32 and the rear class set
The reversed-phase output Voutn connections of cartridge type gain bootstrap amplifying circuit；
Second rear class input transistors MN9, grid are connected with the reversed-phase output VN of the preposition pre-amplification circuit, source electrode
By the earth terminal GND of the 3rd bias current sources 33, drain electrode passes through the second gain bootstrap feedback amplifier 34 and the rear class set
The positive output end Voutp connections of cartridge type gain bootstrap amplifying circuit；
Between the source electrode of the first rear class input transistors MN8 and the second rear class input transistors MN9 source electrode
Electricity can be amplified by the variable resistor R5, R5 of bandwidth programmed circuit control to the telescopic gain bootstrap of the rear class by being connected with
The bandwidth on road is slightly changed, so as to realize that the bandwidth to the programmable fully differential gain bootstrap trsanscondutance amplifier finely tunes work(
Energy；
The reversed-phase output Voutn of the telescopic gain bootstrap amplifying circuit of rear class, increase by the be sequentially connected the 3rd
Beneficial bootstrap feedback amplifying circuit 35 and first loads bias current sources 36, is connected with the high level output end VDD of driving power；
The positive output end Voutp of the telescopic gain bootstrap amplifying circuit of rear class, increase by the be sequentially connected the 4th
Beneficial bootstrap feedback amplifying circuit 37 and second loads bias current sources 38, is connected with the high level output end VDD of driving power.
Specifically, as shown in figure 3, the first rear class input transistors MN8 is nmos pass transistor, the second rear class input transistors
MN9 is nmos pass transistor；
Second bias current sources 31 can use the second bias current nmos pass transistor MN10；
3rd bias current sources 33 can use the 3rd bias current nmos pass transistor MN11；
The first gain bootstrap feedback amplifier 32 includes the first gain bootstrap nmos pass transistor MN12 and first and increased
Benefit bootstrapping booster amplifier N1；
The second gain bootstrap feedback amplifier 34 includes the second gain bootstrap nmos pass transistor MN13 and second and increased
Benefit bootstrapping booster amplifier N2；
N1 input and MN12 source electrode connect, and N1 output end and MN12 grid connect；
N2 input and MN13 source electrode connect, and N2 output end and MN13 grid connect；
The first gain bootstrap booster amplifier N1 and the second gain bootstrap booster amplifier N2 respectively include according to
The source follower of secondary connection and the one-stage amplifier of common-source stage, the signal for inputting the source follower is entered by the source follower
Line level shifts, then produces output by the one-stage amplifier amplified signal of the common-source stage, and then can or else lose described
The telescopic gain of the rear class is significantly increased in the case of the output area of programmable fully differential gain bootstrap trsanscondutance amplifier certainly
Lift the gain of amplifying circuit；
MN12 and MN13 is common bank tube, and N1 and N2 are completely identical in structure gain bootstrap booster amplifiers；MN12 and N1
Gain bootstrap backfeed loop is constituted, MN13 and N2 constitute gain bootstrap backfeed loop, increase load feedback, can effectively increase
Add the gain of the telescopic gain bootstrap amplifying circuit of the rear class；
The 3rd gain bootstrap feedback amplifier 35 includes the first gain bootstrap PMOS (P-Mental-Oxide-
Semiconductor, p-type Metal-oxide-semicondutor) pipe MP1 and the 3rd gain bootstrap booster amplifier P1；
The 4th gain bootstrap feedback amplifier 37 includes the second gain bootstrap PMOS MP2 and the 4th gain bootstrap
Booster amplifier P2；
P1 input and MP1 source electrode connect, and P1 output end and MP1 grid connect；
P2 input and MP2 source electrode connect, and P2 output end and MP2 grid connect；
The 3rd gain bootstrap booster amplifier P1 and the 3rd gain bootstrap booster amplifier P2 respectively include according to
The source follower of secondary connection and the one-stage amplifier of common-source stage, the signal for inputting the source follower is entered by the source follower
Line level shifts, then produces output by the one-stage amplifier amplified signal of the common-source stage, and then can or else lose described
The telescopic gain of the rear class is significantly increased in the case of the output area of programmable fully differential gain bootstrap trsanscondutance amplifier certainly
Lift the gain of amplifying circuit；
The first load bias current sources 36 can use the first bias current PMOS MP3, and second load is partially
The second bias current PMOS MP4 can be used by putting current source 38；
MP3 and MP4 is the load bias current sources of the telescopic gain bootstrap amplifying circuit of the rear class, there is provided output is altogether
Mould feedback point, for forming output common mode feedback control loop, it is achieved thereby that output common mode feedback function, is stabilized described programmable
The output common mode level of fully differential gain bootstrap trsanscondutance amplifier, ensure the programmable fully differential gain bootstrap trsanscondutance amplifier
Normal work；
MN10, grid access the second offset signal Vb2, source ground end GND, drain electrode are connected with MN8 source electrode；
MN8, grid are connected with the positive output end VP of the preposition pre-amplification circuit, and drain electrode is connected with MN12 source electrode；
MN12, drain electrode are connected with the reversed-phase output Voutn of the telescopic gain bootstrap amplifying circuit of the rear class；
MP1, drain electrode be connected with the reversed-phase output Voutn of the telescopic gain bootstrap amplifying circuit of the rear class, source electrode and
MP3 drain electrode connection；
MP3, grid access output common mode feedback signal CMFB, the high level output end VDD connections of source electrode and driving power；
MN11, grid access the second offset signal Vb2, source ground end GND, drain electrode are connected with MN9 source electrode；
MN9, grid are connected with the reversed-phase output VN of the preposition pre-amplification circuit, and drain electrode is connected with MN13 source electrode；
MN13, drain electrode are connected with the positive output end Voutp of the telescopic gain bootstrap amplifying circuit of the rear class；
MP2, drain electrode be connected with the positive output end Voutp of the telescopic gain bootstrap amplifying circuit of the rear class, source electrode and
MP4 drain electrode connection；
MP4, grid access common-mode feedback control voltage CMFB, the high level output end VDD connections of source electrode and driving power；
Specifically, the reversed-phase output Voutn of the telescopic gain bootstrap amplifying circuit of rear class is born by inversion signal
Carry CL1Earth terminal GND, the positive output end Voutp of the telescopic gain bootstrap amplifying circuit of rear class pass through positive signal load
CL2Earth terminal GND, inversion signal load CL1With positive signal load CL2Determine the programmable fully differential gain bootstrap mutual conductance
The driving force of amplifier, capacitance is 12pF (pico farad) in typical case；
R5 is the variable resistor of bandwidth programmed circuit control, and as shown in Figure 3A, R5 can be used and is operated in linear zone
Nmos pass transistor MN14, it can regard a variable active pull-up as, and the second analog programming control signal Vcon2 is used to control
The size of MN14 grid end voltages；When Vcon2 is larger, the conducting resistance that MN14 is formed is smaller, and degeneration resistance is smaller, the rear class
The degraded bandwidth of telescopic gain bootstrap amplifying circuit is smaller, and the bandwidth of the telescopic gain bootstrap amplifying circuit of rear class is small
Lifting, when Vcon2 is smaller, the conducting resistance that MN14 is formed is larger, and degeneration resistance is larger, the telescopic gain bootstrap of rear class
The degraded bandwidth of amplifying circuit is larger, the small reduction of bandwidth of the telescopic gain bootstrap amplifying circuit of rear class, to it is described can
Program fully differential gain bootstrap trsanscondutance amplifier bandwidth adjustment scope it is smaller, realize to the programmable fully differential gain bootstrap across
Lead the bandwidth fine adjustment function of amplifier.
As shown in Figure 4 A, the structure of the 3rd described gain bootstrap feedback amplifier P1 and the 4th gain bootstrap feedback are put
Big circuit P2 structure is identical, only by taking the 3rd gain bootstrap feedback amplifier P1 as an example；
3rd gain bootstrap feedback amplifier P1 includes the first feedback and amplifies nmos pass transistor MN15, the second feedback amplification
Nmos pass transistor MN16, the 3rd feedback amplification nmos pass transistor MN17, the 4th feedback amplification nmos pass transistor MN18 and first are anti-
Feedback amplification PMOS transistor MP5, wherein,
MN15 is the input pipe of the first gain bootstrap feedback amplifier, and level shift is realized using source follower, is protected
The input range for having demonstrate,proved the first gain bootstrap feedback amplifier does not interfere with the output area of telescopic main amplifier, improves
The output voltage swing of the telescopic gain bootstrap amplifying circuit of rear class；
MN16, MN17 are the bias current sources of the 3rd gain bootstrap feedback amplifier；
MN18 is common bank tube, improves the gain of the 3rd gain bootstrap feedback amplifier；
MP5 is the amplifier tube of the 3rd gain bootstrap feedback amplifier, and larger gain is realized using common source level structure；
As shown in Figure 4 B, the structure of the first described gain bootstrap feedback amplifier N1 and the second gain bootstrap feedback are put
Big circuit N2 structure is identical, only by taking the first gain bootstrap feedback amplifier N1 as an example；
First gain bootstrap feedback amplifier N1 includes the 5th feedback and amplifies nmos pass transistor MN19, the second feedback amplification
PMOS transistor MP6, the 3rd feedback amplification PMOS transistor MP7, the 4th feedback feedbacks of amplification PMOS transistor MP8 and the 5th are put
Big pmos transistor MP9 wherein,
MP9 is the input pipe of the 3rd gain bootstrap feedback amplifier, and level shift is realized using source follower, is ensured
The input range of 3rd gain bootstrap feedback amplifier does not interfere with the output area of telescopic main amplifier, after improving
The output voltage swing of the telescopic gain bootstrap amplifying circuit of level；
MP6, MP7 are the bias current sources of the first gain bootstrap feedback amplifier；
MP8 is common bank tube, improves the gain of the first gain bootstrap feedback amplifier；
MN19 is the amplifier tube of the first gain bootstrap feedback amplifier, and larger gain is realized using common source level structure；
Described bandwidth programmed circuit is by outside input digital programmable control signal, to select to export programming control signal
To control above-mentioned variable load network and variable resistor, so as to realize respectively to the programmable fully differential gain bootstrap mutual conductance
The programing function with broad tuning and fine setting of amplifier so that the programmable fully differential gain bootstrap trsanscondutance amplifier is in difference
Can be compared with good berth under speed and stability requirement.
In Fig. 4 A and Fig. 4 B, Vin is input, and Vout is output end, and Vb2 is the second offset signal, and Vb3 is the 3rd inclined
Confidence number, Vb4 are the 4th offset signal, and Vb5 is the 5th offset signal.
As shown in Fig. 5 A, Fig. 5 B, the bandwidth programmed circuit includes selector 51 and bandwidth programming unit；
The bandwidth programming unit includes the first reference current source 521, the output current Iref that output current is Iref
The second reference current source 522, the 3rd reference current source 523 that output current is 2Iref, the 4th that output current is 4Iref
Reference current source 524, output current are 8Iref the 5th reference current source 525, the first programming Control switch S1, the second programming
Controlling switch S2, the 3rd programming Control switch S3, the 4th programming Control switch S4, the 5th passive resistance S5, the 5th passive load
R6 and programmed load NMOS tube MN20, wherein,
The selector 51, it is respectively connected to the first offset signal Vb1, the first analog programming control signal Vcon1, the first number
Word programming control signal D0 and earth terminal GND, selected according to the first digital programmable control signal D0 by Vb1 or GND accesses
Vcon1, to adjust the laod network of the preposition pre-amplification circuit, realize the coarse adjustment function with wide programing；
The first reference current source 521 that output current is Iref, the second reference current source 522 that output current is Iref,
The 3rd reference current source 523 that output current is 2Iref, the 4th reference current source 524 that output current is 4Iref, output electricity
The 5th reference current source 525 for 8Iref is flowed, bias current is produced respectively and is used for producing analog regulation signal to resistive load；
Iref is reference current value；
First programming Control switch S1, the second programming Control switch S2, the 3rd programming Control switch S3, the 4th programming Control
S4 is switched respectively by the second digital programmable control signal D1, the 3rd digital programmable control signal D2, the 4th digital programmable control letter
Number D3, the 5th digital programmable control signal D4 control strobe case, for determining to access great reference current, adjustable range is
Iref to 16 times of Iref；
R6 and MN20 is the resistive load in programming networks gated current source, is used for producing according to the size of current for flowing into load
Corresponding second analog programming control signal Vcon2；
Each reference current source accesses different number of unit reference current source, and five reference current sources access altogether 16
Individual unit reference current source；
First digital programmable control signal D0, the second digital programmable control signal D1, the 3rd digital programmable control signal D2,
4th digital programmable control signal D3 and the 5th digital programmable control signal D4 are determined by outside input, it is determined that described preposition pre-
The gain size of amplifying circuit, and the degeneration resistance size of the telescopic gain bootstrap amplifying circuit of the rear class；Typical case
Under, coarse adjustment is realized in the gain for determining the preposition pre-amplification circuit first by the first digital programmable control signal D0, is secondly being had
In the case of body, by the second digital programmable control signal D1, the 3rd digital programmable control signal D2, the 4th digital programmable control signal
The number of D3 and the 5th digital programmable control signal D4 control access reference current sources produces the second analog programming control signal
Vcon2, specifically, Vcon2 is trim voltage signal, so as to realize degeneration resistance to the programmable fully differential gain bootstrap across
Lead the fine setting of amplifier bandwidth.
As shown in Figure 5 C, first reference current source 521 is included by the first reference current PMOS transistor MP10 and the
Two reference current PMOS transistor MP11 are formed, and are produced a bias current and are used for producing an analog regulation letter to resistive load
Number, MP10 grid access Vb3, MP11 grid access Vb5, MP10 source electrode and the high level output end VDD of driving power
Connection, Iout are the output current of first reference current source 521.
According to a kind of embodiment, described output common mode feedback circuit includes the switching capacity net of SECO
Network, the refresh switch capacitance network when the programmable fully differential gain bootstrap trsanscondutance amplifier resets, then programmable complete
Output common mode is adjusted the switched capacitor network during differential gain bootstrapping trsanscondutance amplifier normal work, ensures output altogether
Mould level bias is in correct position, so as to realize that programmable fully differential gain bootstrap trsanscondutance amplifier is working properly.
As shown in fig. 6, the output common mode feedback circuit includes the 5th clock switch S5, the 6th clock switch
S6, the 7th clock switch S7, the 8th clock switch S8, the 9th clock switch S9, the tenth clock switch
S10, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4, wherein,
First electric capacity C1 top crown, preferable common mode electrical level Vcm is accessed by the 5th clock switch S5, and passed through
8th clock switch S8 is connected with the positive output end Voutp of the telescopic gain bootstrap amplifying circuit of the rear class；
First electric capacity C1 bottom crown, it is connected with the second electric capacity C2 top crown, and passes through the 6th clock switch S6
The 3rd offset signal Vb3 is accessed, output common mode feedback signal CMFB is accessed by the 9th clock switch S9；
Second electric capacity C2 bottom crown accesses preferable common mode electrical level Vcm by the 7th clock switch S7, and passes through
Tenth clock switch S10 is connected with the reversed-phase output Voutn of the telescopic gain bootstrap amplifying circuit of the rear class；
The positive output end Voutp phases of 3rd electric capacity C3 top crown and the telescopic gain bootstrap amplifying circuit of the rear class
Even；
3rd electric capacity C3 bottom crown is connected with the 4th electric capacity C4 top crown and output common mode feedback signal CMFB；
The reversed-phase output Voutn phases of 4th electric capacity C4 bottom crown and the telescopic gain bootstrap amplifying circuit of the rear class
Even；
5th clock switch S5, the 6th clock switch S6 and the 7th clock switch S7 are believed by the first clock
Number CLK control, when the 8th clock switch S8, the 9th clock switch S9 and the tenth clock switch S10 are by second
Clock signal CLKB is controlled, and the first clock signal clk and second clock signal CLKB represent the programmable fully differential gain respectively
The clock that the clock signal of trsanscondutance amplifier work of booting and the programmable fully differential gain bootstrap trsanscondutance amplifier reset, it is real
Output common mode feedback stability when having showed the programmable fully differential gain bootstrap trsanscondutance amplifier work, the programmable fully differential
Refresh switch capacitance network when gain bootstrap trsanscondutance amplifier resets；
As shown in Figure 6A, the programmable fully differential gain bootstrap trsanscondutance amplifier work, CLKB are when CLK is high level
The programmable fully differential gain bootstrap trsanscondutance amplifier resets during high level, CLK and CLKB opposite in phase；
C3 and C4 is detection electric capacity, for detecting the positive output end of the telescopic gain bootstrap amplifying circuit of the rear class
The reversed-phase output Voutn of Voutp and the telescopic gain bootstrap amplifying circuit of rear class common mode electrical level, and produce one altogether
The common-mode feedback point of the mould feedback signal CMFB access telescopic gain bootstrap amplifying circuits of rear class is so as to described programmable complete poor
Divide gain bootstrap trsanscondutance amplifier output common mode to be adjusted, it is biased in appropriate level；
C1 and C2 is to refresh electric capacity, when CLK is high level, i.e., described programmable fully differential gain bootstrap trsanscondutance amplifier
During work, charged by preferable common mode electrical level Vcm and the 3rd offset signal Vb3, it is when CLKB is high level, i.e., described programmable complete
When differential gain bootstrapping trsanscondutance amplifier resets, refresh charge is carried out to C3 and C4, enable its next clock cycle after
It is continuous to carry out common-mode feedback function.
Programmable fully differential gain bootstrap trsanscondutance amplifier of the present invention, there are bandwidth programmable functions, by
Using Bandwidth adjustment technology and adaptive-bandwidth programming electricity in preposition pre-amplification circuit and the telescopic gain bootstrap amplifying circuit of rear class
Road, while high-gain is ensured, it is possible to achieve bandwidth increases and with programming regulation and control amount of bandwidth function, can compiled with realizing
Journey fully differential gain bootstrap trsanscondutance amplifier is issued to different stability and speed ability in different application environments；Increase simultaneously
Fully differential gain bootstrap trsanscondutance amplifier input range programmable greatly, and reduce programmable fully differential gain bootstrap trsanscondutance amplifier
Input parasitic capacitance improve programmable fully differential gain bootstrap trsanscondutance amplifier performance, can be good at meeting high-precision mould
The demand of number converter design.
It is described above to be merely exemplary for the purpose of the present invention, and it is nonrestrictive, and those of ordinary skill in the art understand,
In the case where not departing from the spirit and scope that appended claims are limited, many modifications, change or equivalent can be made, but all
It will fall within the scope of protection of the present invention.
Claims (7)
- A kind of 1. programmable fully differential gain bootstrap trsanscondutance amplifier, it is characterised in that including：Preposition pre-amplification circuit, for amplifying differential input signal, export the differential input signal after pre-amplification；The telescopic gain bootstrap amplifying circuit of rear class, for amplifying the output signal of the preposition pre-amplification circuit, form difference Output signal；Bandwidth programmed circuit, for the programming control signal according to outside input, the bandwidth of the regulation preposition pre-amplification circuit With the bandwidth of the telescopic gain bootstrap amplifying circuit of the rear class；Output common mode feedback circuit, for according to the differential output signal, amplifying electricity to the telescopic gain bootstrap of the rear class Road inputs common mode feedback signal, and causes the telescopic gain bootstrap amplifying circuit output common mode level of rear class in preset range Interior differential output signal；The multiplication factor of the preposition pre-amplification circuit is less than the multiplication factor of the telescopic gain bootstrap amplifying circuit of the rear class；The output common mode feedback circuit includes the switched capacitor network of SECO；The switched capacitor network, it is refreshed, and is used for according to the differential output signal when resetting, to the rear class sleeve Formula gain bootstrap amplifying circuit inputs common mode feedback signal, and causes the telescopic gain bootstrap amplifying circuit output of the rear class altogether The differential output signal of mould level within a predetermined range；The preposition pre-amplification circuit includes：First bias current sources, for providing bias current；Positive input transistor, grid access positive input voltage, source electrode are grounded by first bias current sources, and drain electrode is by just The high level output end of variable load network and driving power connects, and drains as the anti-phase output of the preposition pre-amplification circuit End；Negative input transistor, grid access negative input voltage, source electrode are grounded by first bias current sources, and drain electrode passes through negative The high level output end of variable load network and driving power connects, and drains as the positive output of the preposition pre-amplification circuit End；The gain of the positive variable load network and the gain of the negative variable load network are controlled by analog programming control signal；The telescopic gain bootstrap amplifying circuit of rear class includes：First rear class input transistors, grid are connected with the positive output end of the preposition pre-amplification circuit, and source electrode passes through second Bias current sources are grounded, and drain electrode passes through the first gain bootstrap feedback amplifier gain bootstrap amplification electricity telescopic with the rear class The reversed-phase output connection on road；Second rear class input transistors, grid are connected with the reversed-phase output of the preposition pre-amplification circuit, and source electrode passes through the 3rd Bias current sources are grounded, and drain electrode passes through the second gain bootstrap feedback amplifier gain bootstrap amplification electricity telescopic with the rear class The positive output end connection on road；It is connected between the source electrode of the source electrode of the first rear class input transistors and the second rear class input transistors by institute State the variable resistor of bandwidth programmed circuit control；The reversed-phase output of the telescopic gain bootstrap amplifying circuit of rear class, fed back by the 3rd gain bootstrap being sequentially connected Amplifying circuit and the first load bias current sources, are connected with the high level output end of driving power；The positive output end of the telescopic gain bootstrap amplifying circuit of rear class, fed back by the 4th gain bootstrap being sequentially connected Amplifying circuit and the second load bias current sources, are connected with the high level output end of driving power.
- 2. programmable fully differential gain bootstrap trsanscondutance amplifier as claimed in claim 1, it is characterised in thatThe positive output end of the preposition pre-amplification circuit inputs with the positive of the telescopic gain bootstrap amplifying circuit of the rear class End is connected；The reversed-phase output of the preposition pre-amplification circuit is anti-phase defeated with the telescopic gain bootstrap amplifying circuit of the rear class Enter end to be connected；The positive output end of the telescopic gain bootstrap amplifying circuit of rear class and positive signal load and the output common mode The positive output test side connection of feedback circuit；The reversed-phase output of the telescopic gain bootstrap amplifying circuit of rear class with it is anti-phase The anti-phase output test side of signal load and the output common mode feedback circuit connects；The output common mode feedback signal of the output common mode feedback circuit and the telescopic gain bootstrap amplifying circuit of the rear class Common-mode feedback point connects；The normal phase input end of preposition pre-amplification circuit described in the positive phase input signal input of fully differential input signal, fully differential are defeated Enter the inverting input of the preposition pre-amplification circuit described in the rp input signal input of signal.
- 3. programmable fully differential gain bootstrap trsanscondutance amplifier as claimed in claim 1, it is characterised in that described preposition pre- to put Big circuit and the telescopic gain bootstrap amplifying circuit of the rear class are fully differential structure.
- 4. the programmable fully differential gain bootstrap trsanscondutance amplifier described in claim 1, it is characterised in thatThe positive variable load network includes multiple load circuits in parallel；The negative variable load network includes multiple load circuits in parallel；Each load circuit includes the passive resistance and load transistor being sequentially connected in series.
- 5. programmable fully differential gain bootstrap trsanscondutance amplifier as claimed in claim 1, it is characterised in that first gain Bootstrap feedback amplifying circuit includes the first gain bootstrap nmos pass transistor and the first gain bootstrap booster amplifier；The second gain bootstrap feedback amplifier includes the second gain bootstrap nmos pass transistor and the second gain bootstrap aids in Amplifier；The first gain bootstrap booster amplifier, input are connected with the source electrode of the first gain bootstrap nmos pass transistor, Output end is connected with the grid of the first gain bootstrap nmos pass transistor；The second gain bootstrap booster amplifier, input are connected with the source electrode of the second gain bootstrap nmos pass transistor, Output end is connected with the grid of the second gain bootstrap nmos pass transistor；The first gain bootstrap nmos pass transistor and the second gain bootstrap nmos pass transistor are common bank tube.
- 6. programmable fully differential gain bootstrap trsanscondutance amplifier as claimed in claim 1, it is characterised in that the 3rd gain Bootstrap feedback amplifying circuit includes the first gain bootstrap PMOS and the 3rd gain bootstrap booster amplifier；The 4th gain bootstrap feedback amplifier includes the second gain bootstrap PMOS and the auxiliary amplification of the 4th gain bootstrap Device；3rd gain bootstrap booster amplifier, input are connected with the source electrode of the first gain bootstrap PMOS, output end and first The grid connection of gain bootstrap PMOS；4th gain bootstrap booster amplifier, input are connected with the source electrode of the second gain bootstrap PMOS, output end and second The grid connection of gain bootstrap PMOS；The first gain bootstrap PMOS and the second gain bootstrap PMOS are common bank tube.
- 7. the programmable fully differential gain bootstrap trsanscondutance amplifier as described in claim 5 or 6, it is characterised in that described first Gain bootstrap booster amplifier, the second gain bootstrap booster amplifier, the 3rd gain bootstrap booster amplifier and institute State the 4th gain bootstrap booster amplifier includes the one-stage amplifier for the source follower and common-source stage being sequentially connected respectively；The source follower is used to the signal for inputting the source follower carrying out level shift；The one-stage amplifier of the common-source stage is used for the signal for inputting the source follower after amplification level shifts and output.
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