CN208986903U - A kind of rail-to-rail operational amplifier of low-power consumption - Google Patents
A kind of rail-to-rail operational amplifier of low-power consumption Download PDFInfo
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- CN208986903U CN208986903U CN201821982162.XU CN201821982162U CN208986903U CN 208986903 U CN208986903 U CN 208986903U CN 201821982162 U CN201821982162 U CN 201821982162U CN 208986903 U CN208986903 U CN 208986903U
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Abstract
The utility model discloses a kind of rail-to-rail operational amplifier of low-power consumption, including current mirror module, current switch module, input stage module, class_AB control module, frequency compensation module and output level module；Current mirror module is separately connected current switch module, input stage module and class_AB control module, and input stage module is connect with current switch module and class_AB control module, and frequency compensation module connects class_AB control module and output level module；Current mirror module provides bias current, output level module accesses common mode input signal and exports to class_AB control module, the operating current that current switch module controls input stage circuit keeps stablizing, class_AB control module provides bias voltage for output level module and realizes that push-pull output, output level module carry out processing output amplified signal to common mode input signal；The utility model effectively reduces the fluctuation of rail-to-rail amplifier operating current and mutual conductance, realizes low-power consumption.
Description
Technical field
It is related to a kind of operational amplifier, in particular to a kind of rail-to-rail operational amplifier of low-power consumption.
Background technique
With the continuous reduction of modern integrated circuits manufacture craft characteristic size, the electronic system institute with operational amplifier
It is required that supply voltage also reduce rapidly therewith, but since the threshold voltage of mos pipe is almost unchanged, the operation amplifier of traditional structure
The input/output bound of device also reduces therewith.Currently, the IC design of low-voltage and low-power dissipation has become domestic and international research institution
Primary study object.
Compared with traditional operational amplifier, the common mode of positive-negative power voltage span is may be implemented in rail-to-rail operational amplifier
Input/output bound, and the mutual conductance of input stage is held essentially constant in common-mode input range.Rail-to-rail operational amplifier tradition
Input stage circuit generally uses 1:3 current mirror circuit, bulk driven circuit, and floating gate circuits etc. realize P/N Differential Input to pipe
Operating current conversion, it is generally the case that complementary differential is larger to the operating current of pipe, lower to the degree of control of electric current so that
Operation amplifier circuit power consumption increases, and it is larger that input stage is cross over fluctuation.
Utility model content
The purpose of the utility model is to provide a kind of rail-to-rail operational amplifiers of low-power consumption, effectively reduce rail-to-rail amplifier
Low-power consumption is realized in the fluctuation of operating current and mutual conductance.
A kind of rail-to-rail operational amplifier of low-power consumption, comprising: current mirror module, current switch module, input stage module,
Class_AB control module, frequency compensation module and output level module；Wherein,
The current mirror module is the current switch module, the input stage module, the class_AB control module
Bias current is provided；
The output level module accesses common mode input signal and exports to the class_AB control module；
The operating current of the current switch module control input stage circuit keeps stablizing；
The class_AB control module control module provides bias voltage for the output level module and realizes push-pull output；
The output level module carries out processing output amplified signal to common mode input signal.
In one of the embodiments, the current mirror module include bias current sources, mos pipe M1, M2, M3, M4, M8,
M18, M33, M37, M38 and M43；Wherein,
The source electrode of mos pipe M1, the source electrode of mos pipe M37, the source electrode of mos pipe M43 and the output end of bias current sources connect
Ground；The source electrode of mos pipe M2, the source electrode of mos pipe M3, the source electrode of mos pipe M8, the source electrode of mos pipe M18, mos pipe M33 source electrode and
The source electrode of mos pipe M38 is connected with supply voltage VDD；
The grid of mos pipe M1 is connected with the grid of the grid of mos pipe M37, mos pipe M43 respectively；The drain electrode of mos pipe M1 with
The drain electrode of mos pipe M3 is connected；The grid of mos pipe M2 respectively with the grid of mos pipe M3, the grid of mos pipe M4, mos pipe M8 grid
Pole, the grid of mos pipe M18, mos pipe M33 grid be connected with the grid of mos pipe M38；The drain electrode of mos pipe M2 and bigoted electric current
The input terminal in source is connected；The drain electrode of mos pipe M4 and the drain electrode of mos pipe M8 are connected with the current switch module；Mos pipe M18
Drain electrode be connected with the input stage module；The drain electrode of mos pipe M33 and the drain electrode of mos pipe M38 are controlled with the class_AB
Module is connected.
In one of the embodiments, the current switch module include mos pipe M5, M6, M7, M9, M10, M11, M12 and
M13；Wherein,
The grid of mos pipe M5 connects the positive input of the rail-to-rail operational amplifier；The source electrode of mos pipe M5 respectively with
The source electrode of mos pipe M6, current mirror module connection；The drain electrode of mos pipe M 5 respectively with the source electrode of mos pipe M6, mos pipe M7
Drain electrode is connected；The grid of mos pipe M6 connects the inverting input terminal of the rail-to-rail operational amplifier；Source electrode, the mos of mos pipe M7
The source electrode of pipe M9, the source electrode of mos pipe M10, mos pipe M11 and mos pipe M13 are grounded；The grid of mos pipe M7 is respectively with mos pipe M9's
The drain electrode of grid, mos M7 is connected；The drain electrode of mos pipe M9 is managed with the drain electrode of mos pipe M10, the grid of mos pipe M10, mos respectively
The grid of M11, the grid of mos pipe M 13 are connected with the current mirror module；The drain electrode and the drain electrode of mos pipe M13 of mos pipe M11
It is connected；The grid of mos pipe M12 is connected with supply voltage VDD；The grid of mos pipe M12 respectively with the drain electrode of mos pipe M12, described
Input stage module is connected；The drain electrode of mos pipe M13 is connected with the input stage module.
The input stage module includes PMOS complementary differential to pipe, NMOS complementary differential pair in one of the embodiments,
Pipe and cascode structure circuit, the PMOS complementary differential are separately connected pipe and the NMOS complementary differential to Guan Jun described
Current mirror module, the cascode structure circuit；Class_AB control module described in the cascode structure circuit connection；
Wherein,
The PMOS complementary differential includes mos pipe M14, M15, M16 and M17 to pipe；The NMOS complementary differential is to pipe packet
Include mos pipe M19 and M20；The cascode structure circuit include mos pipe M23, M24, M25, M26, M27, M28, M29, M30,
M31 and M32；
The grid of mos pipe M14 is connected with the grid of mos pipe M15, the current switch module respectively；The source of mos pipe M14
Pole, mos pipe M15 source electrode be connected with supply voltage VDD；The drain electrode of mos pipe M14 is connected with the drain electrode of mos pipe M16；Mos pipe
The drain electrode of M15 is connected with the drain electrode of mos pipe M17；The grid of mos pipe M16 connects the reversed defeated of the rail-to-rail operational amplifier
Enter end；The source electrode of mos pipe M16 is connected with the source electrode of mos pipe M17, the current switch module respectively；The grid of mos pipe M19 connects
Connect the inverting input terminal that the rail-to-rail member calculates amplifier；The source electrode of mos pipe M19 respectively with the source electrode of mos pipe M20, the electricity
Mirror module is flowed to be connected；The drain electrode of mos pipe M19 is connected with the source electrode of mos pipe M29；The grid connection of mos pipe M20 is described rail-to-rail
The positive input of operational amplifier；The drain electrode of mos pipe M20 is connected with the source electrode of mos pipe M30；Source electrode, the mos of mos pipe M23
The source electrode of pipe M24 is connected with supply voltage VDD；The grid of mos pipe M23 is connected with the grid of mos pipe M24, and public termination
Enter bias voltage Vb1；The drain electrode of mos pipe M23 is connected with the source electrode of the drain electrode of mos pipe M14, mos pipe M25 respectively；Mos pipe M24
Drain electrode be connected with the source electrode of mos pipe M26；The grid of mos pipe M25 is connected with the grid of mos pipe M26, and common end access is inclined
Set voltage Vb2；The drain electrode of mos pipe M25 is connected with the source electrode of mos pipe M27；The drain electrode leakage with mos pipe M28 respectively of mos pipe M26
Pole, the class_AB control module are connected；The grid of mos pipe M27 is controlled with the grid of mos pipe M28, the class_AB respectively
Molding block is connected；The drain electrode of mos pipe M27 is connected with the grid of the drain electrode of mos pipe M29, mos pipe M31 respectively；The leakage of mos pipe M28
Pole is connected with the drain electrode of mos pipe M30, the class_AB control module respectively；The grid of mos pipe M29 respectively with mos pipe M30
Grid, bias voltage Vb3It is connected；The source electrode of mos pipe M29 is connected with the drain electrode of mos pipe M31；The source electrode and mos of mos pipe M30
The drain electrode of pipe M32 is connected；The grid of mos pipe M31 is connected with the grid of mos pipe M32；The source electrode of mos pipe M31, mos pipe M32
Source grounding.
The class_AB control module includes mos pipe M34, M35, M36, M39 and M40 in one of the embodiments,；
Wherein,
The source electrode of mos pipe M34 is connected with supply voltage VDD；The grid of the mos pipe M34 source electrode with mos pipe M35 respectively, institute
Current mirror module is stated to be connected；Mos pipe M34 drain electrode respectively with the grid of mos pipe M35, the input stage module, the current mirror
Module is connected；The drain electrode of mos pipe M35 is connect with one end of resistance R1；The other end of resistance R1 is connected with the current mirror module；
The drain electrode of mos pipe M39 is connected with the input stage module, the output level module, the frequency compensation module respectively；Mos pipe
The grid of M39 is connected with the grid of mos pipe M42, the drain electrode of mos pipe M40, the current mirror module respectively；The source of mos pipe M39
Pole respectively with the output level module, the input stage module be connected；The grid of mos pipe M40 respectively with the source electrode of mos pipe M42,
The current mirror module is connected；The drain electrode of mos pipe M42 is connected with one end of resistance R2；The other end of resistance R2 is connected to power supply
Voltage VDD.
The output level module includes mos pipe M44 and M45 in one of the embodiments,；Wherein,
The source electrode of mos pipe M44 is connected to supply voltage VDD；The drain electrode of mos pipe M44 respectively with frequency compensation module, mos
The drain electrode of pipe M45 is connected, and common end is the output end of the output level module；The grid of mos pipe M45 respectively with it is described
Class_AB control module, frequency compensation module are connected；The source electrode of mos pipe M45 is grounded.
Rail-to-rail operational amplifier further includes miller-compensated module in one of the embodiments, the input stage module
The output level module is connected by the miller-compensated module；Wherein,
Resistance R1 and capacitor C1 series connection, and one end of resistance R1 connects input stage module, one end of capacitor C1 connects output
The output end of grade module；Similarly, one end of connection relationship when resistance R2 is identical with capacitor C2, resistance R2 connects input stage module,
The output end of one end connection output level module of capacitor C2；The size for adjusting resistance R and capacitor C is eliminated pole with zero point, is improved
The unity gain bandwidth and frequency stability of rail-to-rail operational amplifier.
A kind of above-mentioned rail-to-rail operational amplifier of low-power consumption, including current mirror module, current switch module, input stage mould
Block, class_AB control module, frequency compensation module and output level module；Current mirror module be separately connected current switch module,
Input stage module and class_AB control module, input stage module are connect with current switch module and class_AB control module,
Frequency compensation module connects class_AB control module and output level module；Current mirror module provides bias current, output stage mould
Block accesses common mode input signal and exports to class_AB control module, and current switch module controls the work electricity of input stage circuit
Stream keeps stablizing, and class_AB control module provides bias voltage for output level module and realizes push-pull output, output level module pair
Common mode input signal carries out processing output amplified signal；A kind of rail-to-rail operation amplifier of low-power consumption in the utility model embodiment
Device effectively reduces the fluctuation of rail-to-rail amplifier operating current and mutual conductance, realizes low-power consumption.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the rail-to-rail operational amplifier of low-power consumption provided by the embodiment of the utility model；
Fig. 2 is a kind of circuit diagram of the rail-to-rail operational amplifier of low-power consumption provided by the embodiment of the utility model.
Specific embodiment
The utility model is further elaborated with reference to the accompanying drawing for the ease of understanding the utility model,.
It is as shown in Figure 1 one of the utility model one embodiment rail-to-rail operational amplifier configuration frame of low-power consumption
Figure, including current mirror module 100, current switch module 101, input stage module 102, class_AB control module 103, frequency are mended
Repay module 104 and output level module 105.
In one embodiment, as shown in Fig. 2, current mirror module 100 include bias current sources, mos pipe M1, M2, M3,
M4, M8, M18, M33, M37, M38 and M43；Wherein,
The source electrode of mos pipe M1, the source electrode of mos pipe M37, the source electrode of mos pipe M43 and the output end of bias current sources connect
Ground；The source electrode of mos pipe M2, the source electrode of mos pipe M3, the source electrode of mos pipe M8, the source electrode of mos pipe M18, mos pipe M33 source electrode and
The source electrode of mos pipe M38 is connected with supply voltage VDD；
The grid of mos pipe M1 is connected with the grid of the grid of mos pipe M37, mos pipe M43 respectively；The drain electrode of mos pipe M1 with
The drain electrode of mos pipe M3 is connected；The grid of mos pipe M2 respectively with the grid of mos pipe M3, the grid of mos pipe M4, mos pipe M8 grid
Pole, the grid of mos pipe M18, mos pipe M33 grid be connected with the grid of mos pipe M38；The drain electrode of mos pipe M2 and bigoted electric current
The input terminal in source is connected；The drain electrode of mos pipe M4 and the drain electrode of mos pipe M8 are connected with the current switch module 101；Mos pipe
The drain electrode of M18 is connected with the input stage module 102；Mos pipe M33 drain electrode and mos pipe M38 drain electrode with the class_
AB control module 103 is connected；
Wherein, bias current sources Iref is used to provide reference current for whole operational amplifier circuit；Mos pipe M2 and mos pipe M3 structure
At 1:1 current-mirror structure, electric current Iref is accurately reproduced in mos pipe M1, then by mos pipe M3, M4, M8, M18, M33 and M38
1:k1:k2:k3:k4:k5 times of current-mirror structure of composition, by k1、k2、k3、k4、k5Electric current I againrefCopy to mos pipe M3, M4,
In M8, M18, M33 and M38, to be respectively supplied to current switch module 101, input stage module 102 and class_AB control mould
Block 103；1:k4:k5 current-mirror structure is constituted by mos pipe M1, M37, M43, by k4, k5 times of electric current IrefCopy to mos pipe
In M37, M43, to be supplied to class_AB control module 103.
In one embodiment, current switch module 101 includes mos pipe M5, M6, M7, M9, M10, M11, M12 and M13；
Wherein,
The grid of mos pipe M5 connects the positive input of the rail-to-rail operational amplifier；The source electrode of mos pipe M5 respectively with
The source electrode of mos pipe M6, the current mirror module 101 connect；Mos pipe M 5 drain electrode respectively with the source electrode of mos pipe M6, mos pipe M7
Drain electrode be connected；The grid of mos pipe M6 connects the inverting input terminal of the rail-to-rail operational amplifier；The source electrode of mos pipe M7,
The source electrode of mos pipe M9, the source electrode of mos pipe M10, mos pipe M11 and mos pipe M13 are grounded；The grid of mos pipe M7 is managed with mos respectively
The drain electrode of the grid, mos M7 of M9 is connected；Mos pipe M9 drain electrode respectively with the drain electrode of mos pipe M10, mos pipe M10 grid,
The grid of mos pipe M11, the grid of mos pipe M13 are connected with the current mirror module 100；The drain electrode of mos pipe M11 and mos pipe M13
Drain electrode be connected；The grid of mos pipe M12 is connected with supply voltage VDD；The leakage with mos pipe M12 respectively of the grid of mos pipe M12
Pole, the input stage module 102 are connected；The drain electrode of mos pipe M13 is connected with the input stage module 102.
When common mode input signal is smaller, mos pipe M5 and mos pipe M6 is worked normally, and flows through k in mos pipe M71Times
Iref；Mos pipe M9 constitutes 1:m current-mirror structure, due to m > k2, the electric current for flowing through mos pipe M9 fails to reach ideal mIrefElectricity
Flow valuve, mos pipe M8 drain-source voltage VdsIncrease, leads to the drain voltage V of mos pipe M9dDecline, mos pipe M10, M11, M12, M13 without
Electric current flows through, and NMOS complementary differential disconnects pipe 107 in output level module 102, and PMOS complementary differential works to pipe 106；When defeated
It is larger to enter common mode voltage signal, mos pipe M5 and mos pipe M6 is disconnected, and no current flows through in mos pipe M7, flows through mos pipe M9 at this time
Current value determined completely by mos pipe M8, the drain voltage V of mos pipe M9dGreater than the threshold voltage V of NMOS tubethn, mos pipe
M10, mos pipe M11, mos pipe M13 are both turned on；1:n/2:n current-mirror structure is constituted by mos pipe M10, M11, M13, by (n/2) *
k2Electric current I againrefMos pipe M12 is copied to, biasing is provided to input stage module 102, by n*k2Electric current I againrefCopy to mos
Pipe M3 provides tail current to pipe 107 for the NMOS differential in input stage module 102, keeps the total working electricity of output level module 102
Flow constant, the fluctuation reduction of mutual conductance, realization low-power consumption.
In one embodiment, input stage module 102 include PMOS complementary differential to pipe 106, NMOS complementary differential to pipe
107 and cascode structure circuit 108, the PMOS complementary differential pipe 106 and the NMOS complementary differential divide equally pipe 107
The current mirror module 100, the cascode structure circuit 108 are not connected；The cascode structure circuit 108 connects institute
State class_AB control module 103；Wherein,
The PMOS complementary differential includes mos pipe M14, M15, M16 and M17 to pipe 106；The NMOS complementary differential is to pipe
107 include mos pipe M19 and M20；The cascode structure circuit 108 include mos pipe M23, M24, M25, M26, M27, M28,
M29, M30, M31 and M32；
The grid of mos pipe M14 is connected with the grid of mos pipe M15, the current switch module 101 respectively；Mos pipe M14's
Source electrode, mos pipe M15 source electrode be connected with supply voltage VDD；The drain electrode of mos pipe M14 is connected with the drain electrode of mos pipe M16；mos
The drain electrode of pipe M15 is connected with the drain electrode of mos pipe M17；The grid of mos pipe M16 connects the reversed of the rail-to-rail operational amplifier
Input terminal；The source electrode of mos pipe M16 is connected with the source electrode of mos pipe M17, the current switch module 101 respectively；Mos pipe M19's
Grid connects the inverting input terminal that the rail-to-rail member calculates amplifier；The source electrode of mos pipe M19 respectively with the source electrode of mos pipe M20,
The current mirror module 100 is connected；The drain electrode of mos pipe M19 is connected with the source electrode of mos pipe M29；The grid of mos pipe M20 connects institute
State the positive input of rail-to-rail operational amplifier；The drain electrode of mos pipe M20 is connected with the source electrode of mos pipe M30；Mos pipe M23's
Source electrode, mos pipe M24 source electrode be connected with supply voltage VDD；The grid of mos pipe M23 is connected with the grid of mos pipe M24, and
Bias voltage Vb1 is accessed in common end；The drain electrode of mos pipe M23 is connected with the source electrode of the drain electrode of mos pipe M14, mos pipe M25 respectively；
The drain electrode of mos pipe M24 is connected with the source electrode of mos pipe M26；The grid of mos pipe M25 is connected with the grid of mos pipe M26, and public
It terminates into bias voltage Vb2；The drain electrode of mos pipe M25 is connected with the source electrode of mos pipe M27；The drain electrode of mos pipe M26 respectively with mos
The drain electrode of pipe M28, the class_AB control module 103 are connected；The grid of mos pipe M27 respectively with the grid of mos pipe M28, institute
Class_AB control module 103 is stated to be connected；The grid phase with the drain electrode of mos pipe M29, mos pipe M31 respectively that drains of mos pipe M27
Even；The drain electrode of mos pipe M28 is connected with the drain electrode of mos pipe M30, the class_AB control module 103 respectively；Mos pipe M29's
Grid respectively with the grid of mos pipe M30, bias voltage Vb3It is connected；The source electrode of mos pipe M29 is connected with the drain electrode of mos pipe M31；
The source electrode of mos pipe M30 is connected with the drain electrode of mos pipe M32；The grid of mos pipe M31 is connected with the grid of mos pipe M32；Mos pipe
The source grounding of the source electrode of M31, mos pipe M32.
108 purpose of cascode structure circuit is that the both-end output signal of input stage module 102 is converted into Single-end output；
Cascode structure circuit 108 is connected with output level module 105, constitutes two stage amplifer, while cascode structure 108 itself has
There is higher gain, to improve the gain of rail-to-rail operational amplifier output stage module 105.
In one embodiment, class_AB control module 103 includes mos pipe M34, M35, M36, M39 and M40；Wherein,
The source electrode of mos pipe M34 is connected with supply voltage VDD；The grid of the mos pipe M34 source electrode with mos pipe M35 respectively, institute
Current mirror module 100 is stated to be connected；The drain electrode of mos pipe M34 respectively with the grid of mos pipe M35, the input stage module 102, described
Current mirror module 100 is connected；The drain electrode of mos pipe M35 is connect with one end of resistance R1；The other end of resistance R1 and the current mirror
Module 100 is connected；The drain electrode of mos pipe M39 respectively with the input stage module 102, the output level module 105, the frequency
Compensating module 104 is connected；The grid of mos pipe M39 respectively with the grid of mos pipe M42, the drain electrode of mos pipe M40, the current mirror
Module 100 is connected；The source electrode of mos pipe M39 respectively with the output level module 105, the input stage module 102 be connected；Mos pipe
The grid of M40 is connected with the source electrode of mos pipe M42, the current mirror module 100 respectively；The drain electrode of mos pipe M42 is with resistance R2's
One end is connected；The other end of resistance R2 is connected to supply voltage VDD.
In one embodiment, the output level module 105 includes mos pipe M44 and M45 in one of the embodiments,；
Wherein,
The source electrode of mos pipe M44 is connected to supply voltage VDD；The drain electrode of mos pipe M44 respectively with frequency compensation module 104,
The drain electrode of mos pipe M45 is connected, and common end is the output end of the output level module 105；The grid of mos pipe M45 respectively with institute
State class_AB control module 103, frequency compensation module connected 104；The source electrode of mos pipe M45 is grounded.
Rail-to-rail operational amplifier further includes miller-compensated module 104, the input stage mould in one of the embodiments,
Block 102 connects the output level module 105 by the miller-compensated module 104；Wherein,
Resistance R1 and capacitor C1 series connection, and one end of resistance R1 connects input stage module 102, one end connection of capacitor C1 is defeated
The output end of grade module 105 out；Similarly, one end of connection relationship when resistance R2 is identical with capacitor C2, resistance R2 connects input stage
Module 102, the output end of one end connection output level module 105 of capacitor C2；The size for adjusting resistance R and capacitor C, is disappeared with zero point
Except pole, the unity gain bandwidth and frequency stability of rail-to-rail operational amplifier are improved.
Above-described embodiment is the preferred forms of the utility model, describes in detail the principles of the present invention,
But therefore it can not understand the limitation to the scope of the utility model.Under the premise of the utility model design, other any shapes
The embodiment of formula belongs to the protection category of the utility model.Therefore, the protection scope of the utility model should be by appended right
It is required that limit.
Claims (8)
1. a kind of rail-to-rail operational amplifier of low-power consumption characterized by comprising current mirror module, current switch module, input
Grade module, class_AB control module, frequency compensation module and output level module；Wherein,
The current mirror module is the current switch module, the input stage module, the class_AB control module provide
Bias current；
The output level module accesses common mode input signal and exports to the class_AB control module；
The operating current of the current switch module control input stage circuit keeps stablizing；
The class_AB control module control module provides bias voltage for the output level module and realizes push-pull output；
The output level module carries out processing output amplified signal to common mode input signal.
2. rail-to-rail operational amplifier according to claim 1, which is characterized in that the current mirror module includes biased electrical
Stream source, mos pipe M1, M2, M3, M4, M8, M18, M33, M37, M38 and M43；Wherein,
The source electrode of mos pipe M1, the source electrode of mos pipe M37, the source electrode of mos pipe M43 and the output end of bias current sources are grounded；mos
The source electrode of pipe M2, the source electrode of mos pipe M3, the source electrode of mos pipe M8, the source electrode of mos pipe M18, the source electrode of mos pipe M33 and mos pipe
The source electrode of M38 is connected with supply voltage VDD；
The grid of mos pipe M1 is connected with the grid of the grid of mos pipe M37, mos pipe M43 respectively；The drain electrode of mos pipe M1 and mos are managed
The drain electrode of M3 is connected；The grid of mos pipe M2 respectively with the grid of mos pipe M3, the grid of mos pipe M4, mos pipe M8 grid, mos
The grid of pipe M18, the grid of mos pipe M33 are connected with the grid of mos pipe M38；The drain electrode of mos pipe M2 is defeated with bigoted current source
Enter end to be connected；The drain electrode of mos pipe M4 and the drain electrode of mos pipe M8 are connected with the current switch module；The drain electrode of mos pipe M18
It is connected with the input stage module；Mos pipe M33 drain electrode and mos pipe M38 drain electrode with the class_AB control module phase
Even.
3. rail-to-rail operational amplifier according to claim 1, which is characterized in that the current switch module includes mos
Pipe M5, M6, M7, M9, M10, M11, M12 and M13；Wherein,
The grid of mos pipe M5 connects the positive input of the rail-to-rail operational amplifier；The source electrode of mos pipe M5 respectively with mos
The source electrode of pipe M6, current mirror module connection；The drain electrode drain electrode with the source electrode of mos pipe M6, mos pipe M7 respectively of mos pipe M 5
It is connected；The grid of mos pipe M6 connects the inverting input terminal of the rail-to-rail operational amplifier；Source electrode, the mos pipe M9 of mos pipe M7
Source electrode, mos pipe M10, mos pipe M11 and mos pipe M13 source electrode ground connection；The grid of mos pipe M7 grid with mos pipe M9 respectively
The drain electrode of pole, mos M7 is connected；Mos pipe M9 drain electrode respectively with the drain electrode of mos pipe M10, the grid of mos pipe M10, mos pipe M11
Grid, mos pipe M 13 grid be connected with the current mirror module；The drain electrode and the drain electrode phase of mos pipe M13 of mos pipe M11
Even；The grid of mos pipe M12 is connected with supply voltage VDD；The grid of mos pipe M12 respectively with the drain electrode of mos pipe M12, described defeated
Enter grade module to be connected；The drain electrode of mos pipe M13 is connected with the input stage module.
4. rail-to-rail operational amplifier according to claim 1, which is characterized in that the input stage module includes PMOS mutual
Differential pair tube, NMOS complementary differential are mended to pipe and cascode structure circuit, the PMOS complementary differential is to pipe and the NMOS
Complementary differential is separately connected the current mirror module, the cascode structure circuit to Guan Jun；The cascode structure electricity
Road connects the class_AB control module.
5. rail-to-rail operational amplifier according to claim 4, which is characterized in that the PMOS complementary differential includes to pipe
Mos pipe M14, M15, M16 and M17；The NMOS complementary differential includes mos pipe M19 and M20 to pipe；The cascode structure
Circuit includes mos pipe M23, M24, M25, M26, M27, M28, M29, M30, M31 and M32；
The grid of mos pipe M14 is connected with the grid of mos pipe M15, the current switch module respectively；The source electrode of mos pipe M14,
The source electrode of mos pipe M15 is connected with supply voltage VDD；The drain electrode of mos pipe M14 is connected with the drain electrode of mos pipe M16；Mos pipe M15
Drain electrode be connected with the drain electrode of mos pipe M17；The grid of mos pipe M16 connects the reversed input of the rail-to-rail operational amplifier
End；The source electrode of mos pipe M16 is connected with the source electrode of mos pipe M17, the current switch module respectively；The grid of mos pipe M19 connects
The rail-to-rail member calculates the inverting input terminal of amplifier；The source electrode of mos pipe M19 respectively with the source electrode of mos pipe M20, the electric current
Mirror module is connected；The drain electrode of mos pipe M19 is connected with the source electrode of mos pipe M29；The grid of mos pipe M20 connects the rail-to-rail fortune
Calculate the positive input of amplifier；The drain electrode of mos pipe M20 is connected with the source electrode of mos pipe M30；Source electrode, the mos pipe of mos pipe M23
The source electrode of M24 is connected with supply voltage VDD；The grid of mos pipe M23 is connected with the grid of mos pipe M24, and common end is accessed
Bias voltage Vb1；The drain electrode of mos pipe M23 is connected with the source electrode of the drain electrode of mos pipe M14, mos pipe M25 respectively；Mos pipe M24's
Drain electrode is connected with the source electrode of mos pipe M26；The grid of mos pipe M25 is connected with the grid of mos pipe M26, and common end access biasing
Voltage Vb2；The drain electrode of mos pipe M25 is connected with the source electrode of mos pipe M27；The drain electrode leakage with mos pipe M28 respectively of mos pipe M26
Pole, the class_AB control module are connected；The grid of mos pipe M27 is controlled with the grid of mos pipe M28, the class_AB respectively
Molding block is connected；The drain electrode of mos pipe M27 is connected with the grid of the drain electrode of mos pipe M29, mos pipe M31 respectively；The leakage of mos pipe M28
Pole is connected with the drain electrode of mos pipe M30, the class_AB control module respectively；The grid of mos pipe M29 respectively with mos pipe M30
Grid, bias voltage Vb3It is connected；The source electrode of mos pipe M29 is connected with the drain electrode of mos pipe M31；The source electrode and mos of mos pipe M30
The drain electrode of pipe M32 is connected；The grid of mos pipe M31 is connected with the grid of mos pipe M32；The source electrode of mos pipe M31, mos pipe M32
Source grounding.
6. rail-to-rail operational amplifier according to claim 1, which is characterized in that the class_AB control module includes
Mos pipe M34, M35, M36, M39 and M40；Wherein,
The source electrode of mos pipe M34 is connected with supply voltage VDD；The grid of the mos pipe M34 source electrode with mos pipe M35 respectively, the electricity
Mirror module is flowed to be connected；Mos pipe M34 drain electrode respectively with the grid of mos pipe M35, the input stage module, the current mirror module
It is connected；The drain electrode of mos pipe M35 is connect with one end of resistance R1；The other end of resistance R1 is connected with the current mirror module；mos
The drain electrode of pipe M39 is connected with the input stage module, the output level module, the frequency compensation module respectively；Mos pipe M39
Grid be connected respectively with the grid of mos pipe M42, the drain electrode of mos pipe M40, the current mirror module；The source electrode of mos pipe M39 point
Not with the output level module, the input stage module be connected；The grid of mos pipe M40 respectively with the source electrode of mos pipe M42, described
Current mirror module is connected；The drain electrode of mos pipe M42 is connected with one end of resistance R2；The other end of resistance R2 is connected to supply voltage
VDD。
7. rail-to-rail operational amplifier according to claim 1, which is characterized in that the output level module includes mos pipe
M44 and M45；Wherein,
The source electrode of mos pipe M44 is connected to supply voltage VDD；The drain electrode of mos pipe M44 respectively with frequency compensation module, mos pipe M45
Drain electrode be connected, and common end be the output level module output end；The grid of mos pipe M45 respectively with the class_AB
Control module, frequency compensation module are connected；The source electrode of mos pipe M45 is grounded.
8. rail-to-rail operational amplifier according to claim 1, which is characterized in that it further include miller-compensated module, it is described
Input stage module connects the output level module by the miller-compensated module.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113671236A (en) * | 2021-08-25 | 2021-11-19 | 广东工业大学 | Current detection circuit and equipment applied to load resistor |
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2018
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113671236A (en) * | 2021-08-25 | 2021-11-19 | 广东工业大学 | Current detection circuit and equipment applied to load resistor |
| CN113671236B (en) * | 2021-08-25 | 2023-07-25 | 广东工业大学 | Current detection circuit and equipment applied to load resistor |
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