CN106656079B - Robustness fully-differential amplifier device - Google Patents
Robustness fully-differential amplifier device Download PDFInfo
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- CN106656079B CN106656079B CN201610867680.6A CN201610867680A CN106656079B CN 106656079 B CN106656079 B CN 106656079B CN 201610867680 A CN201610867680 A CN 201610867680A CN 106656079 B CN106656079 B CN 106656079B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
- H03F3/45179—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using MOSFET transistors as the active amplifying circuit
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
- H03F2203/45—Indexing scheme relating to differential amplifiers
- H03F2203/45334—Indexing scheme relating to differential amplifiers the AAC comprising one or more dif amps as feedback circuit elements
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Abstract
The present invention relates to simulation and composite signal integrated circuits fields, to solve power consumption, the increase of area and the degeneration of performance, it does not need using capacitor or resistance-feedback network, so that it may realize the analog signal amplification of certain gain multiple, and have good robustness.Thus, the technical solution adopted by the present invention is that robustness fully-differential amplifier device, including two parts of open loop fully-differential amplifier and common mode feedback amplifier, open loop fully-differential amplifier uses PMOS tube, to pipe, to use the PMOS tube of positive feedback interconnection form as load as input；In common mode feedback amplifier, using the common mode electrical level of structure the acquisition input signal and output signal of similar five pipe amplifiers, generates feedback signal and give open loop fully-differential amplifier；Fully-differential amplifier is adjusted by feedback signal and exports branch current size, realizes that the adjusting to output voltage common mode electrical level controls.Present invention is mainly applied to IC design manufactures.
Description
Technical field
The present invention relates to simulation and composite signal integrated circuits field, in particular to one kind can be used in signal amplification circuit
Fully differential enlarged structure.
Background technique
Since eighties of last century the fifties integrated circuit is born, integrated circuit is all with surprising in the past few decades
Speed continue to develop, experienced the dramatic change of theoretical basis, circuit structure and manufacturing process, nowadays integrated circuit has been
The every aspect being deeply applied in people's life.It develops to today, operational amplifier has become in Analogous Integrated Electronic Circuits
One of most widely used module is widely used in various analog circuits and Digital Analog Hybrid Circuits.During development, fortune
Universal steering Custom Prosthesis of the design by for calculating amplifier, for different application environments, design have the characteristics that it is corresponding
Operational amplifier.
Operational amplifier is usually used to realize the function of addition subtraction multiplication and division, one kind is most common to answer in actual circuit application
The signal amplifying function of fixed multiple is realized with being exactly, for example common accurately multiplies 2 amplifying circuits.Amplify in this fixed multiple
Application in, operational amplifier is often connected into negative feedback type, and general there are two types of common feedback methods, uses resistance feedback net respectively
Network and capacitive feedback network implementations.The resistance of corresponding resistance value, nothing can be driven using the substantive requirements of form amplifier of resistance-feedback network
The requirement to amplifier power consumption is increased in shape, and resistance-feedback network can occupy biggish chip area.Use capacitive feedback
The form of network generally requires to increase direction of the switch to control capacitor access, increases clock control signal, is easy to interfere mould
Quasi- signal voltage, and capacitor can also occupy more many areas.
Summary of the invention
In order to overcome the deficiencies of the prior art, present invention seek to address that the degeneration of power consumption, the increase of area and performance, proposes one
The fully-differential amplifier of kind open loop working method, does not need using capacitor or resistance-feedback network, so that it may realize specific increasing
The analog signal of beneficial multiple is amplified, and is had good robustness.For this purpose, the technical solution adopted by the present invention is that, robustness
Fully-differential amplifier device, including two parts of open loop fully-differential amplifier and common mode feedback amplifier, the amplification of open loop fully differential
Device uses PMOS tube, to pipe, to use the PMOS tube of positive feedback interconnection form as load as input；Common-mode feedback amplification
In device, using the common mode electrical level of structure the acquisition input signal and output signal of similar five pipe amplifiers, generation feedback signal is opened
Ring fully-differential amplifier；Fully-differential amplifier is adjusted by feedback signal and exports branch current size, is realized total to output voltage
The adjusting of mould level controls.
In open loop fully-differential amplifier, transistor MP3, MP4, MP5, MP6 constitute current source, and MN3, MN4 are constituted by anti-
The current source of feedback signal VFB control, MP15 and MP16 are inputs to transistor, and MP11, MP12, MP13, MP14 are that positive feedback connects
The load transistor of form is connect, MP3 source electrode connects power vd D, and grid connects bias voltage VBP1, and drain electrode connects the source electrode of MP4,
MP4 grid connects bias voltage VBP2, the source electrode of drain electrode connection MP11, MP12, MP13, MP14, and MP11 grid connects MP11 leakage
Pole, the grid of MP12 and the connection MP11 drain electrode of negative output end VO-, MP12 grid, MP12 drain electrode connect positive output end VO+,
MP13 grid connects MP14 drain electrode, MP13 drain electrode connection negative output end VO-, and MP14 grid connects the grid of MP14 drain electrode, MP13
Pole and positive output end VO+, MP5 source electrode connect power vd D, and grid connects bias voltage VBP1, and drain electrode connects the source electrode of MP6,
The grid of MP6 connects bias voltage VBP2, the source electrode of drain electrode connection MP15 and MP16, and the grid of MP15 connects normal phase input end,
Drain electrode connection negative output end, the grid of MP16 connect negative-phase input, drain electrode connection positive output end, the drain electrode connection of MN3
Negative output end, grid connect feedback signal VFB, source electrode connection ground, and the drain electrode of MN4 is connected to positive output end, grid connection
Feedback signal VFB, source electrode connection ground, capacitor C1 top crown connect negative output end VO-, and bottom crown connects feedback signal VFB, electricity
Hold C2 top crown and connect positive output end VO+, bottom crown connects feedback signal VFB.
In feedback amplifier, MP1 source electrode connects power vd D, and grid connects bias voltage VBP1, drain electrode connection MP2's
Source electrode, MP2 grid connect bias voltage VBP2, the source electrode of drain electrode connection MP7, MP8, MP9, MP10, and MP7 grid connects amplifier
Positive output end VO+, the drain electrode of drain electrode connection MN1, MP8 grid connect amplifier negative output end VO-, drain electrode connection MN1 leakage
Pole.MP9 grid connects normal phase input end VIN+, drain electrode connection MN2 drain electrode, i.e. node VFB, MP10 grid connection negative-phase input
VIN-, drain electrode connection MN2 drain electrode, i.e. node VFB, MN1 grid connect MN1 drain electrode and MN2 grid, MN1 source electrode ground connection, MN2 grid
Pole connects MN1 grid, and source electrode ground connection, drain electrode is feedback signal VFB.
The features of the present invention and beneficial effect are:
The present invention uses open loop fully-differential amplifier and common mode feedback amplifier structure, does not use capacitor or resistance feedback
Network, so that it may the analog signal amplification for realizing certain gain multiple, simulation results show the amplifier that the present invention announces has
Good robustness.
Detailed description of the invention:
Fig. 1 is amplifier circuit diagram disclosed by the invention；
Fig. 2 is the amplitude-frequency response race that Monte Carlo simulation obtains；
Fig. 3 is the gain profiles histogram that Monte Carlo simulation obtains.
Specific embodiment
The fully-differential amplifier that the present invention announces mainly includes open loop fully-differential amplifier and common mode feedback amplifier two
Part.Open loop fully-differential amplifier uses PMOS tube, to pipe, to make using the PMOS tube of positive feedback interconnection form as input
For load.In common mode feedback amplifier, the structure acquisition input signal of similar five pipe amplifiers and the common mode electricity of output signal are used
It is flat, it generates feedback signal and gives open loop fully-differential amplifier.It is big that fully-differential amplifier output branch current is adjusted by feedback signal
It is small, realize that the adjusting to output voltage common mode electrical level controls, it is ensured that output common mode level is equal with input common mode electrical level.
In open loop fully-differential amplifier, MP3, MP4, MP5, MP6 are current sources, and MN3, MN4 are controlled by feedback signal VFB
The current source of system.MP15 and MP16 is input to pipe.MP11, MP12, MP13, MP14 are the load crystal of positive feedback type of attachment
Pipe.Its connection relationship is as follows, and MP3 source electrode connects power vd D, and grid connects bias voltage VBP1, the source electrode of drain electrode connection MP4.
MP4 grid connects bias voltage VBP2, the source electrode of drain electrode connection MP11, MP12, MP13, MP14.MP11 grid connects MP11 leakage
Pole, the grid of MP12 and negative output end VO-.MP12 grid connects MP11 drain electrode, and MP12 drain electrode connects positive output end VO+.
MP13 grid connects MP14 drain electrode, MP13 drain electrode connection negative output end VO-.MP14 grid connects the grid of MP14 drain electrode, MP13
Pole and positive output end VO+.MP5 source electrode connects power vd D, and grid connects bias voltage VBP1, the source electrode of drain electrode connection MP6.
The grid of MP6 connects bias voltage VBP2, the source electrode of drain electrode connection MP15 and MP16.The grid of MP15 connects normal phase input end,
Drain electrode connection negative output end.The grid of MP16 connects negative-phase input, drain electrode connection positive output end.The drain electrode of MN3 connects
Negative output end, grid connect feedback signal VFB, source electrode connection ground.The drain electrode of MN4 is connected to positive output end, grid connection
Feedback signal VFB, source electrode connection ground.Capacitor C1 top crown connects negative output end VO-, and bottom crown connects feedback signal VFB.Electricity
Hold C2 top crown and connect positive output end VO+, bottom crown connects feedback signal VFB.
In feedback amplifier, MP1 source electrode connects power vd D, and grid connects bias voltage VBP1, drain electrode connection MP2's
Source electrode, MP2 grid connect bias voltage VBP2, the source electrode of drain electrode connection MP7, MP8, MP9, MP10.MP7 grid connects amplifier
Positive output end VO+, the drain electrode of drain electrode connection MN1.MP8 grid connects amplifier negative output end VO-, drain electrode connection MN1 leakage
Pole.MP9 grid connects normal phase input end VIN+, drain electrode connection MN2 drain electrode, i.e. node VFB.MP10 grid connects negative-phase input
VIN-, drain electrode connection MN2 drain electrode, i.e. node VFB.MN1 grid connects MN1 drain electrode and MN2 grid, MN1 source electrode ground connection.MN2 grid
Pole connects MN1 grid, and source electrode ground connection, drain electrode is feedback signal VFB.
The present invention is described in further detail With reference to embodiment.
The robustness fully-differential amplifier structural circuit figure that the present invention announces is as shown in Figure 1.Full-differential circuits are passed through small
Signal model analyzes the electric current in negative output end VO- using half of circuit analysis method, and the sum of negative output end electric current is
Zero.Ignore channel-length modulation, it is available
gm15×VIN++gm11×VO-+gm13×VO+=0 (1)
Full-differential circuits input and output signal has equal in magnitude, the opposite feature of symbol, VO in small-signal analysis+
=-VO-It brings formula (1) into, obtains
It can similarly obtain
Wherein, the breadth length ratio difference of MP11 and MP14, MP12 and MP13, MP15 and MP16 are equal.Therefore, amplifier gain
It can be write as
Using
Metal-oxide-semiconductor electric current I11:I12:I15=I13:I14:I16=1:2:4,
Mutual conductance expression formulaMutual conductance ratio gm11:gm12:gm15=gm13:gm14:gm16=
1:2:4。
Then amplifier gain is A=4.
In this way, the function of four times of gains of open loop operable amplifier amplification is realized.
Also, the amplifier open-loop amplification factor that the present invention announces is only related with input pipe and load pipe mutual conductance ratio, electricity
Pipe and load tube current are fixed in input by current source in road, are remained unchanged, mutual conductance expression formulaSince input is all PMOS tube to pipe and load pipe, mobility [mu] caused by process deviation and
Gate oxide capacitance CoxVariation is consistent substantially, and transconductance value gm variation tendency can keep high consistency, mutual conductance ratio base
This is constant.Therefore, the fully-differential amplifier structure that the present invention announces has good robustness.
In amplifier operation, output common mode level is adjusted by common mode feedback amplifier, when output common mode level increases
When, the sum of VO+ and VO- increase, and the sum of MP7 and MP8 electric current is caused to reduce, and the sum of MP9 and MP10 electric current increases, feedback signal
VFB increases, so that MN3 and MN4 electric current increases, forms feedback, reduces VO+ and VO- voltage.Conversely, when output common mode level drops
When low, the sum of VO+ and VO- reduce, and the sum of MP7 and MP8 electric current is caused to increase, and the sum of MP9 and MP10 electric current reduces, feedback signal
VFB reduces, so that MN3 and MN4 electric current reduces, forms feedback, increases VO+ and VO- voltage.Always it is to maintain output common mode level etc.
In input common mode electrical level, i.e. VO++VO-=VIN++VIN-。
Fig. 2 is the amplifier amplitude-frequency response race that Monte Carlo simulation obtains, and Fig. 3 is the increasing that Monte Carlo simulation obtains
Beneficial distribution histogram, it can be seen that the gain that 300 emulation obtains is desired for 11.9433dB, standard deviation 0.0546369dB,
Corresponding gain is 3.95517 times, gain deviation 6.3%, i.e., be more than 99.7% probability can by gain control 3.95517 ±
In 0.075 range.Simulation results show the amplifier that the present invention announces has good robustness.
Although above in conjunction with figure, invention has been described, and the invention is not limited to above-mentioned specific embodiment parties
Formula, the above mentioned embodiment is only schematical, rather than restrictive, and those skilled in the art are in this hair
Under bright enlightenment, without deviating from the spirit of the invention, many variations can also be made, these belong to guarantor of the invention
Within shield.
Claims (1)
1. a kind of robustness fully-differential amplifier device, characterized in that amplify including open loop fully-differential amplifier and common-mode feedback
Two parts of device, open loop fully-differential amplifier use PMOS tube, to pipe, to use positive feedback interconnection form as input
PMOS tube is as load；In common mode feedback amplifier, the structure acquisition input signal and output signal of similar five pipe amplifiers are used
Common mode electrical level, generate feedback signal give open loop fully-differential amplifier；Fully-differential amplifier output branch is adjusted by feedback signal
Road size of current realizes that the adjusting to output voltage common mode electrical level controls；In open loop fully-differential amplifier, transistor MP3,
MP4, MP5, MP6 constitute current source, and MN3, MN4 constitute the current source controlled by feedback signal VFB, and MP15 and MP16 are inputs pair
Transistor, MP11, MP12, MP13, MP14 are the load transistors of positive feedback type of attachment, and MP3 source electrode connects power vd D, grid
Pole connects bias voltage VBP1, the source electrode of drain electrode connection MP4, and MP4 grid connects bias voltage VBP2, the connection MP11 that drains,
The source electrode of MP12, MP13, MP14, MP11 grid connect MP11 drain electrode, the grid of MP12 and negative output end VO-, MP12 grid
MP11 drain electrode is connected, MP12 drain electrode connects positive output end VO+, MP13 grid connection MP14 drain electrode, MP13 drain electrode connection negative
Output end VO-, MP14 grid connects MP14 drain electrode, the grid of MP13 and positive output end VO+, MP5 source electrode and connects power vd D,
Grid connects bias voltage VBP1, the source electrode of drain electrode connection MP6, and the grid of MP6 connects bias voltage VBP2, drain electrode connection MP15
With the source electrode of MP16, the grid of MP15 connects normal phase input end, and the grid connection negative of drain electrode connection negative output end, MP16 is defeated
Enter end, drain electrode connection positive output end, the drain electrode of MN3 connects negative output end, and grid connects feedback signal VFB, source electrode connection
Ground, the drain electrode of MN4 are connected to positive output end, and grid connects feedback signal VFB, source electrode connection ground, the connection of capacitor C1 top crown
Negative output end VO-, bottom crown connect feedback signal VFB, and capacitor C2 top crown connects positive output end VO+, bottom crown connection
Feedback signal VFB；In feedback amplifier, MP1 source electrode connects power vd D, and grid connects bias voltage VBP1, drain electrode connection
The source electrode of MP2, MP2 grid connect bias voltage VBP2, the source electrode of drain electrode connection MP7, MP8, MP9, MP10, the connection of MP7 grid
Amplifier positive output end VO+, the drain electrode of drain electrode connection MN1, MP8 grid connect amplifier negative output end VO-, drain electrode connection
MN1 drain electrode, MP9 grid connect normal phase input end VIN+, and drain electrode connection MN2 drains, i.e. node VFB, MP10 grid connects negative
Input terminal VIN-, drain electrode connection MN2 drain electrode, i.e. node VFB, the connection MN1 drain electrode of MN1 grid and MN2 grid, MN1 source electrode ground connection,
MN2 grid connects MN1 grid, and source electrode ground connection, drain electrode is feedback signal VFB.
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| CN201610867680.6A CN106656079B (en) | 2016-09-30 | 2016-09-30 | Robustness fully-differential amplifier device |
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| CN201610867680.6A CN106656079B (en) | 2016-09-30 | 2016-09-30 | Robustness fully-differential amplifier device |
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| CN106656079A CN106656079A (en) | 2017-05-10 |
| CN106656079B true CN106656079B (en) | 2019-06-21 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101888217A (en) * | 2009-05-15 | 2010-11-17 | 佳能株式会社 | Fully-differential amplifier circuit |
| CN103346743A (en) * | 2013-06-18 | 2013-10-09 | 苏州市职业大学 | High-speed high-gain fully-differential operational amplifier |
| CN105099380A (en) * | 2014-05-08 | 2015-11-25 | 中芯国际集成电路制造(上海)有限公司 | Fully-differential amplifier |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6362682B2 (en) * | 1998-06-30 | 2002-03-26 | Agere Systems Guardian Corp. | Common-mode feedback circuit and method |
| ITTO20050195A1 (en) * | 2005-03-25 | 2006-09-26 | St Microelectronics Srl | COMPLETELY DIFFERENTIAL AMPLIFIER DEVICE WITH A TOPOLOGY OF COMMON WAY IN OUTPUT AND RELATIVE CONTROL METHOD |
-
2016
- 2016-09-30 CN CN201610867680.6A patent/CN106656079B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101888217A (en) * | 2009-05-15 | 2010-11-17 | 佳能株式会社 | Fully-differential amplifier circuit |
| CN103346743A (en) * | 2013-06-18 | 2013-10-09 | 苏州市职业大学 | High-speed high-gain fully-differential operational amplifier |
| CN105099380A (en) * | 2014-05-08 | 2015-11-25 | 中芯国际集成电路制造(上海)有限公司 | Fully-differential amplifier |
Non-Patent Citations (4)
| Title |
|---|
| A general description of common-mode feedback in fully-differential amplifiers;P.M Vanpeteghem et al;《IEEE International Symposium on Circuits and Systems》;19900503;3209-3213 |
| Design considerations for common-mode feedback circuits in fully-differential operational transconductance amplifiers with tuning;Pan wu et al;《IEEE International Sympoisum on Circuits & Systems 》;19910614;1363-1366 |
| 一种高增益全差分运算放大器的分析与设计;朱江南等;《微电子学》;20151231;第45卷(第6期);714-717 |
| 高性能全差分运算放大器设计;唐宁等;《微电子学》;20111031;第41卷(第5期);636-639 |
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