CN105811889B - A kind of feedforward compensation formula operational transconductance amplifier - Google Patents
A kind of feedforward compensation formula operational transconductance amplifier Download PDFInfo
- Publication number
- CN105811889B CN105811889B CN201610247218.6A CN201610247218A CN105811889B CN 105811889 B CN105811889 B CN 105811889B CN 201610247218 A CN201610247218 A CN 201610247218A CN 105811889 B CN105811889 B CN 105811889B
- Authority
- CN
- China
- Prior art keywords
- circuit
- nmos tube
- difference
- tube
- gain stage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/08—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements
- H03F1/14—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of neutralising means
-
- 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
- H03F3/45479—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection
- H03F3/45632—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection in differential amplifiers with FET transistors as the active amplifying circuit
- H03F3/45695—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection in differential amplifiers with FET transistors as the active amplifying circuit by using feedforward means
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
- H03F2203/45—Indexing scheme relating to differential amplifiers
- H03F2203/45028—Indexing scheme relating to differential amplifiers the differential amplifier amplifying transistors are folded cascode coupled transistors
Abstract
The present invention discloses a kind of feedforward compensation formula operational transconductance amplifier, including the first gain stage circuit of difference, the second gain stage circuit of difference and feed-back frequency compensation circuit, the first gain stage circuit of difference is in parallel with feed-back frequency compensation circuit after concatenating with the second gain stage circuit of difference.Feed-back frequency compensation circuit is Foldable cascade structure feed forward frequency compensated circuit, which includes: the PMOS tube M3 of cascode structure, NMOS tube M1；PMOS tube M6, the NMOS tube M4 of cascode structure；NMOS tube M7, M8, M9 of PMOS tube M2, M5 and offer tail current.Since the present invention uses Foldable cascade structure feed forward frequency compensated circuit, to replace traditional pole separation miller compensation technology to substantially increase the bandwidth of system while ensure that circuit system is stablized, capacitor is not used, the area of chip is also substantially reduced.
Description
Technical field
The present invention relates to a kind of operational transconductance amplifiers.
Background technique
With the continuous development of integrated circuit integration making technology, portable product is developed rapidly, and to chip in product
Requirement it is also higher and higher, such as area is smaller, power consumption is lower, performance is stronger.Operational amplifier is as in Analogous Integrated Electronic Circuits
Most important component units, the performance of various aspects are also more and more paid attention to.High DC current gain and big unit increase
Gain error when beneficial bandwidth can reduce operational amplifier Closed loop operation and error caused by linear settling time.Operational transconductance is put
Many poles are generally comprised in big device internal circuit, phase is caused to shift, that is to say in phase frequency curve close to before -180 °
Amplitude frequency curve does not drop to 1.Therefore, heavy to have up to high performance operational transconductance amplifier to its stability and frequency compensation
Want meaning.
Current existing frequency acquisition and tracking is mainly Miller capacitance compensation technique, separates two poles, to change phase
Nargin curve.New compensation technique continuously emerges on this basis, such as controls the Miller capacitance compensation of zero point, increases zero point to support
Passive point；Increase source follower to eliminate zero point etc..With the continuous decline of supply voltage, chip area it is continuous reduce and
The raising of various aspects of performance index, previous amplifier frequency acquisition and tracking will be unable to the requirement for meeting IC design, therefore,
The signal-to-noise ratio of circuit is improved, increases bandwidth, obtain stable working region, new compensation technique is one of key.
The Miller capacitance compensation circuit of traditional operational amplifier is as shown in Figure 1, it, which compensates basic principle, is increased first
Between beneficial output stage and the second gain output stage and a upper Miller capacitance and resistance, separate primary and secondary pole.Due to Miller electricity
It include the zero point of a right half plane in capacitive circuit, the zero point of right half plane will promote gain curve in Bode diagram, increase phase
Position variation.Therefore Right-half-plant zero has slackened the stability of system.By the way that right half can be made with the concatenated resistance of Miller capacitance
The zero point of plane is moved to Left half-plane, Lai Gaishan system stability.
Existing frequency acquisition and tracking disadvantage is: (1) being compensated using Miller capacitance, calculate poles and zeros assignment situation, energy
It is enough that accurate prediction carried out to dominant pole frequency, but it cannot effective prediction circuit zero frequency and time pole frequency,
I.e. it is difficult to ensure that zero pole point be completely counterbalanced by especially load capacitance it is unknown or variation in the case where.(2) it is related to the tool of resistance
Body realizes that resistance is generally realized by working in the MOS transistor equivalent resistance of linear zone, but transistor not only has with technique
It closes, and assumes that transistor obeys square-law characteristic using its precondition, therefore the program will have very big error, no
System can be accurately set to stablize.(3) due to introducing capacitor, chip area and power consumption will be considerably increased, simultaneously because capacitor is main
Pole push to it is lower, reduce unity gain bandwidth product.
Summary of the invention
In order to solve the shortcomings of the prior art, the object of the present invention is to provide a kind of feedforward compensation formula operational transconductances to put
Big device.Feedforward compensation circuit in the operational transconductance amplifier improves the stability of system, solves in traditional technology and uses
Capacitor and cause increase power consumption, area and limitation bandwidth the problem of.
To achieve the above object, the technical scheme adopted by the invention is that:
A kind of feedforward compensation formula operational transconductance amplifier, including the first gain stage circuit of difference, difference the second gain stage electricity
Road and feed-back frequency compensation circuit, first gain stage circuit of difference concatenated with the second gain stage circuit of difference after with feedforward
Frequency compensated circuit is in parallel.
Further, the feed-back frequency compensation circuit is Foldable cascade structure feed forward frequency compensated circuit.
Further, the Foldable cascade structure feed forward frequency compensated circuit, comprising: cascode structure
PMOS tube M3, NMOS tube M1；PMOS tube M6, the NMOS tube M4 of cascode structure；PMOS tube M2, M5 and provide tail current
NMOS tube M7, M8, M9, the input terminal of the grid of NMOS tube M1 and the grid of PMOS tube M2 all with the first gain stage circuit of difference
Vin+ electrical connection, the drain electrode of NMOS tube M1 are all connected with the source electrode of PMOS tube M2 with the drain electrode of PMOS tube M3, the grid of NMOS tube M4
Pole is all electrically connected with the input terminal Vin- of the first gain stage circuit of difference with the grid of PMOS tube M5, the drain electrode of NMOS tube M4 with
The drain electrode of PMOS tube M6 is all connected with the source electrode of PMOS tube M5, the drain electrode of PMOS tube M2 and the drain electrode of NMOS tube M8 all with difference
The input terminal Vo1 of two gain stage circuits is electrically connected, the drain electrode of PMOS tube M5 and the drain electrode of NMOS tube M9 all with the second gain of difference
The input terminal Vo2 electrical connection of grade circuit, the source electrode of NMOS tube M4 and the source electrode of NMOS tube M1 are all electric with the drain electrode of NMOS tube M7
The source electrode of connection, NMOS tube M7, M8, M9 is connected, by external common offer bias current.
Beneficial effects of the present invention:
Since the present invention uses Foldable cascade structure feed forward frequency compensated circuit, to replace traditional pole separation close
Compensation technique is strangled, while ensure that circuit system is stablized, substantially increases the bandwidth of system, does not use capacitor, chip
Area is also substantially reduced.
Detailed description of the invention
Invention is further described in detail with reference to the accompanying drawings and detailed description:
Fig. 1 is the structural schematic diagram of the operational amplifier using Miller capacitance compensation in the prior art；
Fig. 2 is structural schematic diagram of the invention；
Fig. 3 is the electrical schematic diagram of feed-back frequency compensation circuit shown in Fig. 2.
Specific embodiment
As shown in Fig. 2, a kind of feedforward compensation formula operational transconductance amplifier, including the first gain stage circuit of difference A1, difference
Second gain stage circuit A2 and feed-back frequency compensation circuit A3, difference the first gain stage circuit A1 and the second gain of difference
It is in parallel with feed-back frequency compensation circuit A3 after grade circuit A2 concatenation.
As shown in figure 3, the feed-back frequency compensation circuit A3 is Foldable cascade structure feed forward frequency compensated circuit,
The Foldable cascade structure feed forward frequency compensated circuit, comprising: the PMOS tube M3 of cascode structure, NMOS tube
M1；PMOS tube M6, the NMOS tube M4 of cascode structure；NMOS tube M7, M8, M9 of PMOS tube M2, M5 and offer tail current,
The grid of NMOS tube M1 is all electrically connected with the input terminal Vin+ of the first gain stage circuit of difference with the grid of PMOS tube M2, NMOS tube
The drain electrode of M1 is all connected with the source electrode of PMOS tube M2 with the drain electrode of PMOS tube M3, the grid of NMOS tube M4 and the grid of PMOS tube M5
All be electrically connected with the input terminal Vin- of the first gain stage circuit of difference, the drain electrode of NMOS tube M4 and the drain electrode of PMOS tube M6 all with
The source electrode of PMOS tube M5 is connected, the input of the drain electrode of PMOS tube M2 and the drain electrode of NMOS tube M8 all with the second gain stage circuit of difference
Hold Vo1 electrical connection, the input terminal Vo2 of the drain electrode of PMOS tube M5 and the drain electrode of NMOS tube M9 all with the second gain stage circuit of difference
Electrical connection, the source electrode of NMOS tube M4 are all electrically connected with the drain electrode of NMOS tube M7 with the source electrode of NMOS tube M1, NMOS tube M7, M8,
The source electrode of M9 is connected, by external common offer bias current, in addition, the grid of PMOS tube M3 and the grid of PMOS tube M6 are electrically connected
It connects, the grid of NMOS tube M7, M8, M9 are connected.
Foldable cascade structure feed forward frequency compensated circuit is to utilize to introduce Left half-plane zero point in forward path,
It is moved with the negative of the positive phase shifted cancellation pole of zero point.The compensation is to adjust in high band to zero pole point, and then will not reduce 3dB band
Width does not influence its unity gain bandwidth.
Simulating, verifying: in the circuit of the operational transconductance amplifier of this patent, pass through simulating, verifying feedforward of the invention
Frequency acquisition and tracking, is shown using Cadence spectre emulation: when being compensated using Miller capacitance, its unit bandwidth is long-pending only
For 24.61MHz, phase margin is 59.9 °；Use its unit bandwidth of Feedforward Compensation Technology of the invention product for 1.138GHz, phase
Position nargin is 75.21 °.
The above is a preferred embodiment of the present invention, cannot limit the right model of the present invention with this certainly
It encloses, it is noted that for those skilled in the art, modify or wait to technical solution of the present invention
With replacement, without departure from the protection scope of technical solution of the present invention.
Claims (1)
1. a kind of feedforward compensation formula operational transconductance amplifier, it is characterised in that: including the first gain stage circuit of difference, difference second
Gain stage circuit and feed-back frequency compensation circuit, first gain stage circuit of difference are concatenated with the second gain stage circuit of difference
It is in parallel with feed-back frequency compensation circuit afterwards；The feed-back frequency compensation circuit is Foldable cascade structure feed forward frequency compensation
Circuit；The Foldable cascade structure feed forward frequency compensated circuit, comprising: the PMOS tube M3 of cascode structure,
NMOS tube M1；PMOS tube M6, the NMOS tube M4 of cascode structure；The NMOS tube M7 of PMOS tube M2, M5 and offer tail current,
The grid of M8, M9, NMOS tube M1 are all electrically connected with the input terminal Vin+ of the first gain stage circuit of difference with the grid of PMOS tube M2,
The drain electrode of NMOS tube M1 is all connected with the source electrode of PMOS tube M2 with the drain electrode of PMOS tube M3, the grid and PMOS tube M5 of NMOS tube M4
Grid be all electrically connected with the input terminal Vin- of the first gain stage circuit of difference, the leakage of the drain electrode of NMOS tube M4 and PMOS tube M6
Pole is all connected with the source electrode of PMOS tube M5, the drain electrode of PMOS tube M2 and the drain electrode of NMOS tube M8 all with the second gain stage circuit of difference
Input terminal Vo1 electrical connection, the input of the drain electrode of PMOS tube M5 and the drain electrode of NMOS tube M9 all with the second gain stage circuit of difference
Vo2 electrical connection is held, the source electrode of NMOS tube M4 is all electrically connected with the drain electrode of NMOS tube M7 with the source electrode of NMOS tube M1, NMOS tube
The source electrode of M7, M8, M9 are connected, by external common offer bias current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610247218.6A CN105811889B (en) | 2016-04-20 | 2016-04-20 | A kind of feedforward compensation formula operational transconductance amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610247218.6A CN105811889B (en) | 2016-04-20 | 2016-04-20 | A kind of feedforward compensation formula operational transconductance amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105811889A CN105811889A (en) | 2016-07-27 |
| CN105811889B true CN105811889B (en) | 2019-03-05 |
Family
ID=56458233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610247218.6A Active CN105811889B (en) | 2016-04-20 | 2016-04-20 | A kind of feedforward compensation formula operational transconductance amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105811889B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10523166B2 (en) * | 2017-06-07 | 2019-12-31 | Analog Devices Global | Differential amplifier with modified common mode rejection, and to a circuit with an improved common mode rejection ratio |
| CN107370461B (en) * | 2017-07-17 | 2020-07-10 | 电子科技大学 | Compensation structure applied to transimpedance amplifier |
| CN109508063B (en) * | 2018-12-28 | 2024-03-15 | 西安航天民芯科技有限公司 | Error amplifier with feedforward compensation network |
| CN109728786A (en) * | 2019-03-01 | 2019-05-07 | 赣南师范大学 | A kind of intersection construction high-gain two-stage calculation trsanscondutance amplifier |
| CN112448678A (en) * | 2019-08-30 | 2021-03-05 | 深圳市中兴微电子技术有限公司 | Compensation circuit, chip, method, device, storage medium and electronic device |
| CN110601670A (en) * | 2019-10-11 | 2019-12-20 | 厦门理工学院 | Microphone programmable gain amplifier integrated circuit |
| CN113890496A (en) * | 2021-10-20 | 2022-01-04 | 重庆吉芯科技有限公司 | Four-order feedforward compensation operational amplifier and design method thereof |
| CN115328254B (en) * | 2022-09-11 | 2023-12-29 | 北京工业大学 | High transient response LDO circuit based on multiple frequency compensation modes |
| CN117792299A (en) * | 2024-02-23 | 2024-03-29 | 普源精电科技股份有限公司 | Amplifier and oscilloscope |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101917169A (en) * | 2010-08-05 | 2010-12-15 | 复旦大学 | High-bandwidth low-power consumption frequency-compensation three-stage operational amplifier |
| CN101917171A (en) * | 2010-08-19 | 2010-12-15 | 华东师范大学 | Broadband programmable gain amplifier based on operational amplifier |
| CN103199807A (en) * | 2013-03-26 | 2013-07-10 | 电子科技大学 | Split compensation two-stage operational amplifier based on inverter input structure |
| CN204103873U (en) * | 2014-10-28 | 2015-01-14 | 李梦雄 | A kind of active feed forward circuit forms frequency compensated differential operational amplifier |
| CN205509980U (en) * | 2016-04-20 | 2016-08-24 | 佛山臻智微芯科技有限公司 | Feedforward compensation formula mutual conductance operational amplifier |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7535211B2 (en) * | 2006-05-24 | 2009-05-19 | Intersil Americas Inc. | Voltage regulator having current canceling compensation |
-
2016
- 2016-04-20 CN CN201610247218.6A patent/CN105811889B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101917169A (en) * | 2010-08-05 | 2010-12-15 | 复旦大学 | High-bandwidth low-power consumption frequency-compensation three-stage operational amplifier |
| CN101917171A (en) * | 2010-08-19 | 2010-12-15 | 华东师范大学 | Broadband programmable gain amplifier based on operational amplifier |
| CN103199807A (en) * | 2013-03-26 | 2013-07-10 | 电子科技大学 | Split compensation two-stage operational amplifier based on inverter input structure |
| CN204103873U (en) * | 2014-10-28 | 2015-01-14 | 李梦雄 | A kind of active feed forward circuit forms frequency compensated differential operational amplifier |
| CN205509980U (en) * | 2016-04-20 | 2016-08-24 | 佛山臻智微芯科技有限公司 | Feedforward compensation formula mutual conductance operational amplifier |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105811889A (en) | 2016-07-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105811889B (en) | A kind of feedforward compensation formula operational transconductance amplifier | |
| Kim et al. | A capacitorless LDO regulator with fast feedback technique and low-quiescent current error amplifier | |
| Garimella et al. | Reverse nested Miller compensation using current buffers in a three-stage LDO | |
| Galan et al. | Super class-AB OTAs with adaptive biasing and dynamic output current scaling | |
| CN105897196B (en) | A kind of feedforward compensation push-pull computer amplifier | |
| CN106055012A (en) | High-speed LDO (Low Dropout Regulator) circuit capable of increasing power supply rejection ratio | |
| CN104793672B (en) | A kind of low pressure difference linear voltage regulator of high PSRR | |
| CN102541134A (en) | LDO (Low DropOut Regulator) based on dynamic zero pole tracking technology | |
| Giustolisi et al. | 1.2-V CMOS op-amp with a dynamically biased output stage | |
| CN103760943B (en) | A kind of slew rate enhancing circuit being applied to LDO | |
| CN103490616B (en) | Current-mode DC-DC converter | |
| CN105739585B (en) | A kind of low-power consumption LDO circuit for radio circuit | |
| CN105159383A (en) | Low dropout regulator with high power supply rejection ratio | |
| CN205509980U (en) | Feedforward compensation formula mutual conductance operational amplifier | |
| CN205827288U (en) | A kind of high speed LDO circuit improving PSRR | |
| CN103176494B (en) | Voltage-controlled zero compensating circuit | |
| Qin et al. | Dual AC boosting compensation scheme for multistage amplifiers | |
| Yang et al. | Modeling and optimization of fast-settling time gain-boosted cascode CMOS amplifiers | |
| CN110224700A (en) | A kind of high speed complementation type dual power supply operational amplifier | |
| CN109672418A (en) | A kind of high gain operational amplifier using feedforward compensation | |
| Xu et al. | A 0.96-0.9-V Fully Integrated FVF LDO With Two-Stage Cross-Coupled Error Amplifier | |
| CN105867504B (en) | Reference voltage source with high power supply rejection ratio (PSRR) | |
| CN205509986U (en) | Feedforward compensation push -pull type operational amplifier | |
| Centurelli et al. | An improved reversed miller compensation technique for three‐stage CMOS OTAs with double pole‐zero cancellation and almost single‐pole frequency response | |
| CN105676932A (en) | Off-chip capacitor LDO circuit based on self-adaptive power tube technology |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |