CN105811889A - Feedforward compensation type transconductance operational amplifier - Google Patents
Feedforward compensation type transconductance operational amplifier Download PDFInfo
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- CN105811889A CN105811889A CN201610247218.6A CN201610247218A CN105811889A CN 105811889 A CN105811889 A CN 105811889A CN 201610247218 A CN201610247218 A CN 201610247218A CN 105811889 A CN105811889 A CN 105811889A
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- 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
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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
- H03F3/45479—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
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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
- H03F2203/45028—Indexing scheme relating to differential amplifiers the differential amplifier amplifying transistors are folded cascode coupled transistors
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Abstract
The invention discloses a feedforward compensation type transconductance operational amplifier which comprises a difference first gain stage circuit, a difference second gain stage circuit and a feedforward frequency compensation circuit. The difference first gain stage circuit and the difference second gain stage circuit are connected with the feedforward frequency compensation circuit in parallel after being connected in series. The feedforward frequency compensation circuit is of a folding type cascode structure and comprises a PMOS transistor M3, an NMOS transistor M1, a PMOS transistor M6, an NMOS transistor M4, PMOS transistors M2 and M5 and NMOS transistors M7, M8 and M9, wherein the PMOS transistor M3 and the NMOS transistor M1 are of a cascode structure, the PMOS transistor M6 and the NMOS transistor M4 are of a cascode structure, and the NMOS transistors M7, M8 and M9 provide tail current. Due to the fact that the feedforward frequency compensation circuit of the folding type cascode structure is adopted for replacing a traditional pole separation miller compensation technology, stability of a circuit system is ensured, meanwhile, the bandwidth of the system is greatly improved, no capacitor is adopted, and the chip area is greatly reduced.
Description
Technical field
The present invention relates to a kind of operational transconductance amplifier.
Background technology
Along with the development of integrated circuit integration making technology, portable product develops rapidly, and the requirement of product chips is also more and more higher, as less in area, power consumption is lower, performance is higher.Operational amplifier is as component units topmost in Analogous Integrated Electronic Circuits, and the performance of its each side is also affected by increasing attention.Gain error when high DC current gain and big unity gain bandwidth can reduce operational amplifier Closed loop operation and the error that linearly time of setting up causes.Operational transconductance amplifier internal circuit generally comprises many limits, causes that phase place offsets, that is to say that amplitude frequency curve does not drop to 1 before close-180 ° of phase frequency curve.Therefore, for reaching high performance operational transconductance amplifier, its stability and frequency compensation is significant.
Current existing frequency acquisition and tracking is mainly Miller capacitance compensation technique, makes two limits separate, changes phase margin curve.Compensation technique new on this basis constantly occurs, the Miller capacitance as controlled zero point compensates, and increases zero point and offsets limit；Increase source follower and eliminate zero point etc..Along with constantly the declining of supply voltage, constantly the reducing and the raising of various aspects of performance index of chip area, conventional amplifier frequency acquisition and tracking will be unable to meet the requirement of IC design, therefore, improving the signal to noise ratio of circuit, increase bandwidth, obtain stable working region, new compensation technique is one of crucial.
The Miller capacitance of traditional operational amplifier compensate circuit as it is shown in figure 1, its compensate ultimate principle be between the first gain output stage and the second gain output stage and on a Miller capacitance and resistance, make primary and secondary limit separate.Owing to comprising the zero point of a RHP in Miller capacitance circuit, the zero point of RHP will promote gain curve in Bode diagram, increase phase place change.Therefore Right-half-plant zero has slackened the stability of system.The zero point shifting to Left half-plane of RHP can be made by the resistance connected with Miller capacitance, improve system stability.
Existing frequency acquisition and tracking has drawbacks in that (1) uses Miller capacitance to compensate, calculate poles and zeros assignment situation, dominant pole frequency can be carried out accurate prediction, but it can not effectively prediction circuit zero frequency and time pole frequency, namely it is difficult to ensure that be completely counterbalanced by zero pole point, especially when load capacitance the unknown or change.(2) implementing of resistance is related to, resistance is generally realized by the MOS transistor equivalent resistance being operated in linear zone, but transistor is not only relevant with technique, and square-law characteristic obeyed by transistor to use its precondition to assume that, therefore the program will have very big error, it is impossible to accurately makes system stability.(3) owing to introducing electric capacity, chip area and power consumption will be considerably increased, and simultaneously because electric capacity is pushed dominant pole to lower, reduce unity gain bandwidth and amass.
Summary of the invention
In order to solve the deficiency that prior art exists, it is an object of the invention to provide a kind of feedforward compensation formula operational transconductance amplifier.Feedforward compensation circuit in this operational transconductance amplifier improves the stability of system, solves the problem using electric capacity in conventional art and cause increase power consumption, area and restriction bandwidth.
For achieving the above object, the technical solution adopted in the present invention is:
A kind of feedforward compensation formula operational transconductance amplifier, compensating circuit including difference the first gain stage circuit, difference the second gain stage circuit and feed-back frequency, described difference the first gain stage circuit compensates circuit in parallel with feed-back frequency after concatenating with difference the second gain stage circuit.
Further, described feed-back frequency compensates circuit is Foldable cascade structure feed forward frequency compensated circuit.
Further, described Foldable cascade structure feed forward frequency compensated circuit, including: the PMOS M3 of cascode structure, NMOS tube M1；The PMOS M6 of cascode structure, NMOS tube M4；nullPMOS M2、The NMOS tube M7 of M5 and offer tail current、M8、M9，The grid of NMOS tube M1 all electrically connects with the input Vin+ of difference the first gain stage circuit with the grid of PMOS M2，The drain electrode of NMOS tube M1 is all connected with the source electrode of PMOS M2 with the drain electrode of PMOS M3，The grid of NMOS tube M4 all electrically connects with the input Vin-of difference the first gain stage circuit with the grid of PMOS M5，The drain electrode of NMOS tube M4 is all connected with the source electrode of PMOS M5 with the drain electrode of PMOS M6，The drain electrode of PMOS M2 all electrically connects with the input Vo1 of difference the second gain stage circuit with the drain electrode of NMOS tube M8,The drain electrode of PMOS M5 all electrically connects with the input Vo2 of difference the second gain stage circuit with the drain electrode of NMOS tube M9,The source electrode of NMOS tube M4 all electrically connects 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，Bias current is provided jointly by outside.
Beneficial effects of the present invention:
Due to thisInventionAdopt Foldable cascade structure feed forward frequency compensated circuit, replace tradition limit separation miller compensation technology, it is ensured that while Circuits System is stable, substantially increase the bandwidth of system, it does not have using electric capacity, the area of chip is also substantially reduced。
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Fig. 1 is the structural representation of the operational amplifier adopting Miller capacitance to compensate in prior art；
Fig. 2 is the structural representation of the present invention；
Fig. 3 is the electrical schematic diagram that feed-back frequency shown in Fig. 2 compensates circuit.
Detailed description of the invention
As shown in Figure 2, a kind of feedforward compensation formula operational transconductance amplifier, compensate after circuit A3, described difference the first gain stage circuit A1 concatenate with difference the second gain stage circuit A2 in parallel with feed-back frequency compensation circuit A3 including difference the first gain stage circuit A1, difference the second gain stage circuit A2 and feed-back frequency.
As it is shown on figure 3, it is Foldable cascade structure feed forward frequency compensated circuit that described feed-back frequency compensates circuit A3, described Foldable cascade structure feed forward frequency compensated circuit, including: the PMOS M3 of cascode structure, NMOS tube M1；The PMOS M6 of cascode structure, NMOS tube M4；nullPMOS M2、The NMOS tube M7 of M5 and offer tail current、M8、M9，The grid of NMOS tube M1 all electrically connects with the input Vin+ of difference the first gain stage circuit with the grid of PMOS M2，The drain electrode of NMOS tube M1 is all connected with the source electrode of PMOS M2 with the drain electrode of PMOS M3，The grid of NMOS tube M4 all electrically connects with the input Vin-of difference the first gain stage circuit with the grid of PMOS M5，The drain electrode of NMOS tube M4 is all connected with the source electrode of PMOS M5 with the drain electrode of PMOS M6，The drain electrode of PMOS M2 all electrically connects with the input Vo1 of difference the second gain stage circuit with the drain electrode of NMOS tube M8,The drain electrode of PMOS M5 all electrically connects with the input Vo2 of difference the second gain stage circuit with the drain electrode of NMOS tube M9,The source electrode of NMOS tube M4 all electrically connects 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，Bias current is provided jointly by outside，Additionally，The grid of PMOS M3 electrically connects with the grid of PMOS M6，NMOS tube M7、M8、The grid of M9 is connected.
Foldable cascade structure feed forward frequency compensated circuit is to utilize to introduce Left half-plane zero point in forward path, moves with the negative of the positive phase shifted cancellation limit of zero point.This compensation is to zero pole point adjustment at high band, and then will not reduce three dB bandwidth, does not affect its unity gain bandwidth.
Simulating, verifying: in the circuit of the operational transconductance amplifier of this patent, the feed-back frequency compensation technique of the present invention by simulating, verifying, Cadencespectre emulation is used to show: its unit bandwidth is long-pending when using Miller capacitance to compensate is only 24.61MHz, and phase margin is 59.9 °；Its unit bandwidth of Feedforward Compensation Technology adopting the present invention amasss as 1.138GHz, and phase margin is 75.21 °.
The above is the preferred embodiment of the present invention; certainly the interest field of the present invention can not be limited with this; should be understood that; for those skilled in the art; technical scheme is modified or equivalent replacement, without departure from the protection domain of technical solution of the present invention.
Claims (3)
1. a feedforward compensation formula operational transconductance amplifier, it is characterized in that: include difference the first gain stage circuit, difference the second gain stage circuit and feed-back frequency and compensate circuit, described difference the first gain stage circuit compensates circuit in parallel with feed-back frequency after concatenating with difference the second gain stage circuit.
2. feedforward compensation formula operational transconductance amplifier according to claim 1, it is characterised in that: it is Foldable cascade structure feed forward frequency compensated circuit that described feed-back frequency compensates circuit.
3. feedforward compensation formula operational transconductance amplifier according to claim 2, it is characterised in that: described Foldable cascade structure feed forward frequency compensated circuit, including: the PMOS M3 of cascode structure, NMOS tube M1；The PMOS M6 of cascode structure, NMOS tube M4；nullPMOS M2、The NMOS tube M7 of M5 and offer tail current、M8、M9，The grid of NMOS tube M1 all electrically connects with the input Vin+ of difference the first gain stage circuit with the grid of PMOS M2，The drain electrode of NMOS tube M1 is all connected with the source electrode of PMOS M2 with the drain electrode of PMOS M3，The grid of NMOS tube M4 all electrically connects with the input Vin-of difference the first gain stage circuit with the grid of PMOS M5，The drain electrode of NMOS tube M4 is all connected with the source electrode of PMOS M5 with the drain electrode of PMOS M6，The drain electrode of PMOS M2 all electrically connects with the input Vo1 of difference the second gain stage circuit with the drain electrode of NMOS tube M8,The drain electrode of PMOS M5 all electrically connects with the input Vo2 of difference the second gain stage circuit with the drain electrode of NMOS tube M9,The source electrode of NMOS tube M4 all electrically connects 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，Bias current is provided jointly by outside.
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| CN201610247218.6A CN105811889B (en) | 2016-04-20 | 2016-04-20 | A kind of feedforward compensation formula operational transconductance amplifier |
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| CN201610247218.6A CN105811889B (en) | 2016-04-20 | 2016-04-20 | A kind of feedforward compensation formula operational transconductance amplifier |
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| CN105811889B CN105811889B (en) | 2019-03-05 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107370461A (en) * | 2017-07-17 | 2017-11-21 | 电子科技大学 | A kind of collocation structure applied to trans-impedance amplifier |
| CN109004911A (en) * | 2017-06-07 | 2018-12-14 | 亚德诺半导体集团 | The difference amplifier of common mode inhibition with adjusting and circuit with improved common mode rejection ratio |
| CN109508063A (en) * | 2018-12-28 | 2019-03-22 | 西安航天民芯科技有限公司 | A kind of 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 |
| CN110601670A (en) * | 2019-10-11 | 2019-12-20 | 厦门理工学院 | Microphone programmable gain amplifier integrated circuit |
| WO2021037054A1 (en) * | 2019-08-30 | 2021-03-04 | 深圳市中兴微电子技术有限公司 | Compensation circuit and chip, method, apparatus, storage medium, and electronic device |
| CN115328254A (en) * | 2022-09-11 | 2022-11-11 | 北京工业大学 | High transient response LDO circuit based on multiple frequency compensation modes |
| WO2023065522A1 (en) * | 2021-10-20 | 2023-04-27 | 重庆吉芯科技有限公司 | Fourth-order feed-forward compensated operational amplifier and design method therefor |
| CN117792299A (en) * | 2024-02-23 | 2024-03-29 | 普源精电科技股份有限公司 | Amplifier and oscilloscope |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109004911B (en) * | 2017-06-07 | 2023-12-01 | 亚德诺半导体国际无限责任公司 | Differential amplifier with regulated common mode rejection and circuit with improved common mode rejection ratio |
| CN109004911A (en) * | 2017-06-07 | 2018-12-14 | 亚德诺半导体集团 | The difference amplifier of common mode inhibition with adjusting and circuit with improved common mode rejection ratio |
| CN107370461A (en) * | 2017-07-17 | 2017-11-21 | 电子科技大学 | A kind of collocation structure applied to trans-impedance amplifier |
| CN107370461B (en) * | 2017-07-17 | 2020-07-10 | 电子科技大学 | Compensation structure applied to transimpedance amplifier |
| CN109508063A (en) * | 2018-12-28 | 2019-03-22 | 西安航天民芯科技有限公司 | A kind of error amplifier with feedforward compensation network |
| 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 |
| WO2021037054A1 (en) * | 2019-08-30 | 2021-03-04 | 深圳市中兴微电子技术有限公司 | Compensation circuit and chip, method, apparatus, 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 |
| WO2023065522A1 (en) * | 2021-10-20 | 2023-04-27 | 重庆吉芯科技有限公司 | Fourth-order feed-forward compensated operational amplifier and design method therefor |
| CN115328254A (en) * | 2022-09-11 | 2022-11-11 | 北京工业大学 | High transient response LDO circuit based on multiple frequency compensation modes |
| 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 |
| CN117792299B (en) * | 2024-02-23 | 2024-05-14 | 普源精电科技股份有限公司 | Amplifier and oscilloscope |
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| CN105811889B (en) | 2019-03-05 |
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