CN102570989A - Operational amplifier - Google Patents
Operational amplifier Download PDFInfo
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- CN102570989A CN102570989A CN2010106053729A CN201010605372A CN102570989A CN 102570989 A CN102570989 A CN 102570989A CN 2010106053729 A CN2010106053729 A CN 2010106053729A CN 201010605372 A CN201010605372 A CN 201010605372A CN 102570989 A CN102570989 A CN 102570989A
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Abstract
The invention provides an operational amplifier. The operational amplifier is characterized by comprising an input structure, a feedback network, an output structure and a bias network, wherein the input structure comprises an NMOS (N-channel metal oxide semiconductor) input operational amplifying circuit and a PMOS (P-channel metal oxide semiconductor) input operational amplifying circuit; the feedback network comprises an NMOS feedback loop connected with the NMOS input operational amplifying circuit and a PMOS feedback loop connected with the PMOS input operational amplifying circuit; the NMOS feedback loop and the PMOS feedback loop are used for ensuring the current of transistors to depend on the input voltage and the input end resistance under the condition that the input voltage Vi is greater or smaller than the reference voltage Vref; the output structure is used for amplifying signals transmitted by the input structure; and the bias network is used for supplying power to the input structure, the output structure and the feedback network simultaneously. The operational amplifier has the following beneficial effects: the reference voltage is set and the operational amplifier feedback loops with high gains are adopted; the current in the transistors has unipolarity, so good linear transconductance can be obtained; and meanwhile, a large dynamic voltage input range (from the ground to the power voltage) is realized.
Description
[technical field]
The present invention relates to the IC design field, relate in particular to operational amplification circuit.
[background technology]
In semiconductor device, operational amplifier is widely used in amplifying the signal that will handle.In the uncensored patent application of Japan, its publication number is an example of having announced operational amplifier among the No.H6-326529 (United States Patent(USP) No. 5,311,145).Operational amplifier comprises input stage amplifier and output stage amplifier.Input stage amplifier is according to the input structure converted input signal and the amplification input signal of output stage amplifier.In addition, the transistorized no-load current of forming output stage amplifier is flow through in the input stage amplifier setting.Output stage amplifier is amplified in the signal that generates in the input stage amplifier and exports this signal.
Along with the reduction of MOS size, require to reduce supply voltage to guarantee that transistor is not damaged.But consider and almost remain unchanged transistorized threshold voltage (this mainly is the consideration from threshold value in the Digital Logical Circuits; Keep suitably big metal-oxide-semiconductor threshold value, help guaranteeing higher noise margin), be reduced to 1.5V so work as supply voltage; Even about 1V the time; So for guaranteeing certain gain, often adopt the cascade structure, but traditional cascode structure arithmetic amplifier has been difficult to operate as normal.The reduction of supply voltage has simultaneously caused the reduction of common mode input scope; For addressing this problem; Often be to adopt Rail-to-Rail (track to track) input structure to solve the input reference signal problem of smaller; But the technical problem of this kind track to track operational amplifier is the input mutual conductance meeting of circuit structure and changes along with the variation of input signal, bigger nonlinear wave occurs thereby cause importing mutual conductance.Though the Current Regulation technology can reduce the input mutual conductance with input voltage change non-linear, effect is ungood especially; Circuit structure is also comparatively complicated simultaneously, and power consumption is also higher.
In view of above drawback, but be necessary to provide a kind of operational amplification circuit of improvement to solve above-mentioned defective.
[summary of the invention]
The object of the present invention is to provide a kind of operational amplifier, solving because of the input mutual conductance meeting of the circuit structure variation along with input signal changes, thus the bigger nonlinear problem that causes.
The technical scheme that realizes said purpose is: a kind of operational amplification circuit, and it comprises:
Input structure, it comprises NMOS input discharge circuit and PMOS input discharge circuit;
Feedback network; It comprises NMOS feedback loop that is connected with NMOS input discharge circuit and the PMOS feedback loop that is connected with PMOS input discharge circuit; Said NMOS feedback loop and PMOS feedback loop be used for input voltage Vi greater than reference voltage Vref and the situation of input voltage Vi less than reference voltage Vref under, make transistorized electric current all depend on the size of input voltage and input pickup resistance;
Export structure, the signal that input structure is transmitted amplifies;
And biasing networks, simultaneously to input structure, export structure and feedback network power supply.
Alternatively; Said feedback network adopts reference voltage Vref and feedback loop is set; One-way by transistor current can be known; As input voltage Vi during greater than reference voltage Vref, said PMOS feedback loop makes the conducting of PMOS input discharge circuit, and said NMOS feedback loop ends NMOS input discharge circuit; As input voltage Vi during less than reference voltage Vref, said PMOS feedback loop ends PMOS input discharge circuit, and said NMOS feedback loop makes the conducting of NMOS input discharge circuit.
Alternatively, said NMOS input discharge circuit and PMOS input discharge circuit all are provided for miller-compensated RC series circuit.
Alternatively, the miller-compensated resistance R c value of said RC series circuit is greater than or equal to the transconductance value inverse of Cascade serial transistor.
Alternatively, the output current size of said operational amplifier is | (Vi-Vref)/R|, the transconductance value that obtains is 1/R.
Alternatively, said operational amplification circuit is monitored the output signal of export structure through said feedback network.
Alternatively, said NMOS input discharge circuit and PMOS input discharge circuit all adopt the cascade cascaded structure.
Alternatively, the voltage gain of said operational amplifier is the ratio of output impedance and said input pickup resistance.
Compared with prior art; The beneficial effect of above-mentioned operational amplifier is: the operational amplifier feedback loop that the present invention is provided with reference voltage and adopts high-gain; And the electric current in the transistor has one-way; Can obtain the favorable linearity mutual conductance, realize the voltage input dynamic range on big (from ground to the supply voltage) simultaneously.
[description of drawings]
Fig. 1 is a kind of execution mode sketch map of operational amplifier of the present invention;
Fig. 2 is a kind of embodiment circuit diagram of operational amplifier of the present invention;
Fig. 3 is a kind of circuit diagram of the comparator 201 in the operational amplifier shown in Figure 3;
Fig. 4 is the another kind of embodiment circuit diagram of operational amplifier of the present invention;
Fig. 5 is a kind of circuit diagram of the operational amplifier 103 in the operational amplifier shown in Figure 4.
[embodiment]
With reference to shown in Figure 1, a kind of execution mode of operational amplification circuit of the present invention comprises:
Input structure obtains signal and signal is transferred to export structure;
Export structure, the signal that input structure is transmitted amplifies;
Feedback network extracts the export structure amplifying signal and feeds back to input structure;
Biasing networks is simultaneously to input structure, export structure and feedback network power supply.
The operational amplification circuit of above-mentioned execution mode, through the output signal of feedback network to export structure, promptly the output end signal of whole operational amplifier is monitored.
Adopt the low pressure high gain operational amplifier to come that input is carried out current potential in the operational amplification circuit and clamp down on, and guarantee that the input input voltage value is a reference voltage Vref.Below through some practical circuit above-mentioned low pressure high gain operational amplifier is described further.
With reference to shown in Figure 2, it be a kind of embodiment of operational amplification circuit of the present invention, and its input is PMOS transistor P1, and when applied signal voltage during less than reference voltage Vref, input P1 does not have the electric current inflow, and then this input P1 does not participate in the amplification of signal; And when applied signal voltage during greater than reference voltage Vref; Then the inflow current size is (Vi-Vref)/R; Then in the scope of Vi＞Vref, guaranteed the stability of input P1 equivalent transconductance, promptly importing mutual conductance will can not change along with the amplitude of input signal.
With reference to shown in Figure 3, it is the circuit structure of the low pressure high gain operational amplifier among a kind of embodiment of operational amplification circuit of the present invention, and this circuit structure is the two-stage calculation amplifier structure, and purpose is the gain that provides higher.Adopt NMOS as input stage in this circuit structure, the PMOS input is adopted in the second level subsequently, because of considering the stability of circuit, so in circuit structure, adopt RC to connect miller-compensated technology to eliminate the influence of right zero point to the stability of a system.Wherein miller-compensated resistance R c require value greater than or equate with the transconductance value of MP3 (or MP4) is reciprocal, thereby when eliminating right zero point, can introduce the phase margin of left zero point with increase operational amplifier structure.
For adapting to the power supply voltage of continuous reduction; Simultaneously for satisfying higher direct voltage gain; So in circuit structure, adopt the cascade cascaded structure to satisfy higher gain requirement usually, meanwhile, in circuit structure, adopt the frequency compensation technology to guarantee the stable of circuit structure.Said low pressure high gain operational amplifier comprises: PMOS pipe MP1～MP4 and NMOS pipe MN1～MN5, and wherein, NMOS pipe MN1, MN2 are as differential pipe difference receiving inputted signal Vi and reference signal Vref; NMOS pipe MN3 receives bias voltage Vb1.
With reference to shown in Figure 4; It is for the another kind of embodiment of operational amplification circuit of the present invention; Its input is nmos pass transistor N1, and when applied signal voltage during less than reference voltage Vref, the size of current that flows through input N1 is (Vref-Vi)/R; Guaranteed the stability of input N1 mutual conductance this moment equally, and promptly importing mutual conductance will can not change along with the amplitude of input signal; And when the voltage amplitude of input signal was higher than reference voltage Vref, the electric current that flows through among the input N1 was zero, and promptly input N1 does not participate in the amplification of signal.
With reference to shown in Figure 5, it is the circuit structure of the low pressure high gain operational amplifier among a kind of embodiment of operational amplification circuit of the present invention, and this circuit structure is the two-stage calculation amplifier structure, and purpose is the gain that provides higher.Adopt PMOS as input stage in this circuit structure, the NMOS input is adopted in the second level subsequently, because of considering the stability of circuit, so in circuit structure, adopt RC to connect miller-compensated technology to eliminate the influence of right zero point to the stability of a system.Wherein miller-compensated resistance R c require value greater than or and reciprocal equating of transconductance value of MN3 ' (or MN4 '), thereby when eliminating right zero point, can introduce phase margin at left side zero point with increase operational amplifier structure.
Said low pressure high gain operational amplifier comprises: PMOS pipe MP1 '～MP5 ' and NMOS pipe MN1～MN4, and wherein, PMOS pipe MP1 ', MP2 ' are as differential pipe difference receiving inputted signal Vi and reference signal Vref; PMOS pipe MP3 ' receives bias voltage Vb1.
This shows that circuit can form complementary input and output in whole signal excursion, and kept the stability of mutual conductance in the gamut simultaneously.Promptly in whole input signal amplitude scope, the output current size of operational amplifier structure is | (Vi-Vref)/R|, the input mutual conductance that obtains is 1/R, can guarantee to import the stability of mutual conductance.
In sum, the general structure of operational amplification circuit of the present invention adopts the operational amplifier feedback loop of reference voltage and high-gain, and the one-way of transistor current has determined the conducting state of pipe under input voltage and reference voltage different situations.And in whole input voltage range, the size of electric current only is decided by the size of input voltage and input series resistor, so this structure can obtain the favorable linearity mutual conductance, realizes the input dynamic range on big (from ground to the supply voltage) simultaneously.
Though the present invention discloses as above with preferred embodiment, the present invention is defined in this.Any those skilled in the art are not breaking away from the spirit and scope of the present invention, all can do various changes and modification, so protection scope of the present invention should be as the criterion with claim institute restricted portion.
Claims (8)
1. operational amplifier is characterized in that it comprises:
Input structure, it comprises NMOS input discharge circuit and PMOS input discharge circuit;
Feedback network; It comprises NMOS feedback loop that is connected with NMOS input discharge circuit and the PMOS feedback loop that is connected with PMOS input discharge circuit; Said NMOS feedback loop and PMOS feedback loop be used for input voltage Vi greater than reference voltage Vref and the situation of input voltage Vi less than reference voltage Vref under, make transistorized electric current all depend on the size of input voltage and input pickup resistance;
Export structure, the signal that input structure is transmitted amplifies;
And biasing networks, simultaneously to input structure, export structure and feedback network power supply.
2. operational amplifier as claimed in claim 1; It is characterized in that; Said feedback network adopts reference voltage Vref also feedback loop to be set, and can be known by the one-way of transistor current, as input voltage Vi during greater than reference voltage Vref; Said PMOS feedback loop makes the conducting of PMOS input discharge circuit, and said NMOS feedback loop ends NMOS input discharge circuit; As input voltage Vi during less than reference voltage Vref, said PMOS feedback loop ends PMOS input discharge circuit, and said NMOS feedback loop makes the conducting of NMOS input discharge circuit.
3. operational amplifier as claimed in claim 2 is characterized in that, said NMOS input discharge circuit and PMOS input discharge circuit all are provided for miller-compensated RC series circuit.
4. operational amplifier as claimed in claim 3 is characterized in that, the miller-compensated resistance R c value of said RC series circuit is greater than or equal to the transconductance value inverse of Cascade serial transistor.
5. like any described operational amplifier of claim 1-4, it is characterized in that the output current size of said operational amplifier is | (Vi-Vref)/R|, the transconductance value that obtains is 1/R.
6. operational amplifier as claimed in claim 5 is characterized in that, said operational amplification circuit is monitored the output signal of export structure through said feedback network.
7. operational amplifier as claimed in claim 6 is characterized in that, said NMOS input discharge circuit and PMOS input discharge circuit all adopt the cascade cascaded structure.
8. operational amplifier as claimed in claim 7 is characterized in that, the voltage gain of said operational amplifier is the ratio of output impedance and said input pickup resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010605372.9A CN102570989B (en) | 2010-12-27 | 2010-12-27 | Operational amplification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010605372.9A CN102570989B (en) | 2010-12-27 | 2010-12-27 | Operational amplification circuit |
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| CN102570989A true CN102570989A (en) | 2012-07-11 |
| CN102570989B CN102570989B (en) | 2016-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201010605372.9A Active CN102570989B (en) | 2010-12-27 | 2010-12-27 | Operational amplification circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023440A (en) * | 2012-12-20 | 2013-04-03 | 中国科学院微电子研究所 | Circuit for improving linearity of power amplifier |
| CN105305971A (en) * | 2015-11-03 | 2016-02-03 | 深圳先进技术研究院 | Low-noise preamplifier circuit with reduced input capacitors |
| WO2021026860A1 (en) * | 2019-08-15 | 2021-02-18 | 深圳市汇顶科技股份有限公司 | Amplifier circuit, chip, and electronic apparatus |
| CN113346855A (en) * | 2021-05-12 | 2021-09-03 | 上海磐启微电子有限公司 | Large-signal linear amplification circuit implementation method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030080810A1 (en) * | 2001-10-25 | 2003-05-01 | Martin Reber | Operational amplifier with chopped input transistor pair |
| CN1751433A (en) * | 2003-02-13 | 2006-03-22 | 皇家飞利浦电子股份有限公司 | Low voltage class AB transconductor circuits |
| CN101635560A (en) * | 2009-08-26 | 2010-01-27 | 余浩 | High-speed two-stage calculation amplifier |
-
2010
- 2010-12-27 CN CN201010605372.9A patent/CN102570989B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030080810A1 (en) * | 2001-10-25 | 2003-05-01 | Martin Reber | Operational amplifier with chopped input transistor pair |
| CN1751433A (en) * | 2003-02-13 | 2006-03-22 | 皇家飞利浦电子股份有限公司 | Low voltage class AB transconductor circuits |
| CN101635560A (en) * | 2009-08-26 | 2010-01-27 | 余浩 | High-speed two-stage calculation amplifier |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023440A (en) * | 2012-12-20 | 2013-04-03 | 中国科学院微电子研究所 | Circuit for improving linearity of power amplifier |
| CN103023440B (en) * | 2012-12-20 | 2015-10-07 | 中国科学院微电子研究所 | A kind of circuit improving power amplifier linearity |
| CN105305971A (en) * | 2015-11-03 | 2016-02-03 | 深圳先进技术研究院 | Low-noise preamplifier circuit with reduced input capacitors |
| CN105305971B (en) * | 2015-11-03 | 2019-04-26 | 深圳先进技术研究院 | A kind of low noise preamplifier circuit reducing input capacitance |
| WO2021026860A1 (en) * | 2019-08-15 | 2021-02-18 | 深圳市汇顶科技股份有限公司 | Amplifier circuit, chip, and electronic apparatus |
| US11575357B2 (en) | 2019-08-15 | 2023-02-07 | Shenzhen GOODIX Technology Co., Ltd. | Amplifier circuit, chip and electronic device |
| CN113346855A (en) * | 2021-05-12 | 2021-09-03 | 上海磐启微电子有限公司 | Large-signal linear amplification circuit implementation method |
| CN113346855B (en) * | 2021-05-12 | 2023-10-10 | 上海磐启微电子有限公司 | Large-signal linear amplifying circuit implementation method |
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| CN102570989B (en) | 2016-08-10 |
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Free format text: FORMER OWNER: WUXI HUARUN SHANGHUA TECHNOLOGY CO., LTD. Effective date: 20131216 |
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Effective date of registration: 20131216 Address after: 214028 Wuxi provincial high tech Industrial Development Zone, Hanjiang Road, No. 5, Jiangsu, China Applicant after: Wuxi CSMC Semiconductor Co., Ltd. Address before: 214028 Wuxi provincial high tech Industrial Development Zone, Hanjiang Road, No. 5, Jiangsu, China Applicant before: Wuxi CSMC Semiconductor Co., Ltd. Applicant before: Wuxi Huarun Shanghua Technology Co., Ltd. |
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Effective date of registration: 20171208 Address after: 214028 Xinzhou Road, Wuxi national hi tech Industrial Development Zone, Jiangsu, China, No. 8 Patentee after: Wuxi Huarun Shanghua Technology Co., Ltd. Address before: 214028 Wuxi provincial high tech Industrial Development Zone, Hanjiang Road, No. 5, Jiangsu, China Patentee before: Wuxi CSMC Semiconductor Co., Ltd. |