CN101373954B - Method for amplifying voltage signal and operational amplifier - Google Patents
Method for amplifying voltage signal and operational amplifier Download PDFInfo
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- CN101373954B CN101373954B CN2007100940356A CN200710094035A CN101373954B CN 101373954 B CN101373954 B CN 101373954B CN 2007100940356 A CN2007100940356 A CN 2007100940356A CN 200710094035 A CN200710094035 A CN 200710094035A CN 101373954 B CN101373954 B CN 101373954B
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Abstract
The invention provides a method for voltage signal amplification. An input signal is directly input to input stage circuits, the number of which is N (N is more than or equals to 2); a signal which is output form a first input stage circuit is transmitted to a first gain stage circuit; the signal which is amplified through the first gain stage circuit is then added with an output signal of a second input stage circuit; the added signal is input to a second gain stage, the connection continues gradual in this way until the output signal of an N input stage circuit and the output signal of an N-1 gain stage circuit are added, and finally, the signal which is amplified is output through an output stage circuit. An operational amplifier which is obtained according to the method is also provided. The multi-input stage operational amplifier can ensure the increase of the DC gain, and have the phase reserve sufficing to stabilize and the unity-gain bandwidth which is wide enough.
Description
Technical field
The present invention relates to the method that a kind of voltage signal amplifies, particularly a kind of operational amplification circuit.
Background technology
Operational amplifier is the key modules of Analog Circuit Design, and it applies to filter in a large number, and digital analog converter is in the analog-digital converter design.
Operational amplifier uses usually in closed loop is used, and in order to reach desirable amplifier characteristic, wishes that the open-loop gain of amplifier increases as far as possible.The method that increases gain is the gain stage number (see figure 1) that increases series connection, but its shortcoming is the high frequency phase shift that gain stage of every increase will increase a part to the open loop function of operational amplifier, finally can bring stability problem.Therefore the DC current gain of conventional operation amplifier is high more, and its bandwidth is narrow more, to guarantee the stable work of operational amplifier.
Summary of the invention
The technical problem to be solved in the present invention provides the method that a kind of voltage signal amplifies, and it has high DC current gain, and can guarantee that the bandwidth of amplified signal is constant, to guarantee the stable of signal.The present invention also provides a kind of operational amplifier.
For solving the problems of the technologies described above, the method that voltage signal of the present invention amplifies, input signal is directly inputted into the individual input stage circuit of N (N 〉=2), deliver to the 1st gain stage circuit from the signal of the output of the 1st input stage circuit, signal after described the 1st gain stage circuit amplified again with the output signal addition of the 2nd input stage circuit, described signal after addition is input to the 2nd gain stage, connect successively, to output signal addition, export signal after the amplification by output-stage circuit at last with the output signal of N input stage circuit and N-1 gain stage circuit.
The present invention also provides a kind of operational amplifier that method adopted of realizing that above-mentioned voltage signal amplifies, comprise N (N 〉=2) individual input stage circuit and N-1 gain stage circuit, the input voltage of operational amplifier directly links to each other with N input stage circuit, (n≤N) output of individual input stage circuit is linked the input of n gain stage circuit to n, after amplifying, be connected with the output of n+1 input stage circuit again, after be connected to the input of n+1 gain stage circuit, after the output of the output of N input stage circuit and N-1 gain stage circuit is connected the most at last, be connected to the input of output-stage circuit.Described input stage circuit is made up of two identical MOS transistor and three constant-current sources with gain stage circuit, the input loading power voltage of one of them constant-current source, and output is connected with the source electrode of described two MOS transistor respectively, and the drain electrode of described two MOS transistor is respectively by two other constant-current source ground connection; Described input voltage is received the grid of described two MOS transistor in all input stage circuits, the voltage of exporting from the transistor of n input stage circuit is connected to transistorized grid n the gain stage circuit respectively, after amplifying, be connected addition with the source electrode output of n+1 input stage circuit respectively again, and the signal after the addition is delivered to transistorized grid in n+1 the gain stage circuit respectively.
The present invention also provides the another kind of operational amplifier that method adopted of realizing that above-mentioned voltage signal amplifies, described operational amplifier comprises N input stage circuit and N-1 gain stage circuit, wherein N is the integer greater than 1, the input voltage of operational amplifier directly links to each other with a described N input stage circuit, the output of n input stage circuit is linked the input of n gain stage circuit, n≤N wherein, after amplifying, be connected with the output of n+1 input stage circuit again, be connected to the input of n+1 gain stage circuit then, after the output of the output of N input stage circuit and N-1 gain stage circuit is connected the most at last, be connected to the input of output-stage circuit; Described input stage circuit is made up of two identical triodes and three constant-current sources with gain stage circuit, the input loading power voltage of one of them constant-current source, and output is connected with the emitter of described two triodes respectively, and the collector electrode of described two triodes is respectively by two other constant-current source ground connection; Described input voltage is received the base stage of described two triodes in all input stage circuits, be connected to the base stage of triode n the gain stage circuit respectively from the voltage of the triode of n input stage circuit output, after amplifying, be connected addition with the collector electrode output of n+1 input stage circuit respectively again, and the signal after the addition delivered to the base stage of triode in n+1 the gain stage circuit respectively.
In technical scheme of the present invention, suppose that the DC current gain of all gain stages and input stage all equates, be A
0, operational amplifier DC current gain then of the present invention is A
0 N, it is worth with the N exponential increase.Because each input stage and gain stage circuit all are the single order lowpass systems, so the high frequency characteristics of final output voltage is by last input stage N decision, this just can guarantee that when increasing DC current gain having of many input stages operational amplifier is enough to stable phase margin and enough wide unity gain bandwidth.
Description of drawings
The present invention is further detailed explanation below in conjunction with accompanying drawing and embodiment:
Fig. 1 is existing common operational amplifier schematic diagram;
Fig. 2 is the schematic diagram of operational amplifier of the present invention;
Fig. 3 is one embodiment of the present of invention;
Fig. 4 is an another embodiment of the present invention.
Embodiment
The method that voltage signal of the present invention amplifies, input signal is directly inputted into the individual input stage circuit of N (N 〉=2), deliver to the 1st gain stage circuit from the signal of the output of the 1st input stage circuit, signal after described the 1st gain stage circuit amplified again with the output signal addition of the 2nd input stage circuit, described signal after addition is input to the 2nd gain stage, and the like, to output signal addition, export signal after the amplification by output-stage circuit at last with the output signal of N input stage circuit and N-1 gain stage circuit.Fig. 2 is an operational amplifier schematic diagram of the present invention, and the input voltage of this operational amplifier is sent into a plurality of input stage circuits, and in the drawings, input voltage directly links to each other with N input stage circuit.The input of gain stage circuit 1 is linked in the output of input stage 1, and through after amplifying, with the output addition of input stage 2, its result is input to gain stage 2 again.Connect continuously so successively, to the end, the output addition of the output of input stage N and gain stage N-1 obtains the output voltage of final operational amplifier.
Fig. 3 is an embodiment, provided the circuit structure of many input stages operational amplifier of two input stages and a gain stage formation, vip, vin is an input signal, voutp, voutn are output signals, and leftmost module is an input stage 1, middle module is a gain stage 1, and rightmost module is an input stage 2.Input stage circuit and gain stage circuit are formed by two MOS transistor and three constant-current sources: the input loading power voltage of one of them constant-current source, and output is connected with the source electrode of described two MOS transistor respectively, and the drain electrode of described two MOS transistor is respectively by two other constant-current source ground connection; Input voltage is received the transistorized grid in all input stage circuits, the voltage of the transistor output of input stage 1 is connected to transistorized grid in the gain stage 1 respectively, after amplifying, be connected output signal voutp and voutn after the output signal addition of gain stage 1 and input stage 2 with the drain electrode output of input stage 2 respectively again.The DC current gain of supposing gain stage and input stage all equates, is A
0, then the operational amplifier DC current gain of this embodiment is A
0 2
The also replaceable one-tenth triode of transistor among above-mentioned Fig. 3 (also claiming bipolar transistor), the i.e. described circuit diagram of Fig. 4.Input stage circuit is formed by two identical triodes and three constant-current sources with gain stage circuit: the input loading power voltage of one of them constant-current source, and output is connected with the emitter of described two triodes respectively, and the collector electrode of described two triodes is respectively by two other constant-current source ground connection; Input voltage is received the grid of the triode in all input stage circuits, the voltage of the triode output of input stage 1 is connected to the base stage of triode in the gain stage 1 respectively, after amplifying, be connected output signal voutp and voutn after the output signal addition of gain stage 1 and input stage 2 with the collector electrode output of input stage 2 respectively again.
The quantity of input stage and gain stage can increase according to user's requirement in the foregoing circuit.Other all belong to the protection content of patent of the present invention based on the version and the various circuit way of realization of this method and thinking.In the operational amplifier of the present invention, because each input stage and gain stage circuit all are the single order lowpass systems, so the high frequency characteristics of final output voltage is by last input stage N decision, this just can guarantee that having of many input stages operational amplifier is enough to stable phase margin and enough wide unity gain bandwidth.
Claims (3)
1. the voltage signal method of amplifying, it is characterized in that: input signal is directly inputted into N input stage circuit, wherein N is the integer greater than 1, deliver to the 1st gain stage circuit from the signal of the 1st input stage circuit output, signal after described the 1st gain stage circuit amplified again with the output signal addition of the 2nd input stage circuit, signal after the addition is input to the 2nd gain stage, connect successively, to output signal addition, export signal after the amplification by output-stage circuit at last with the output signal of N input stage circuit and N-1 gain stage circuit.
2. operational amplifier that method adopted of realizing that voltage signal as claimed in claim 1 amplifies, it is characterized in that: described operational amplifier comprises N input stage circuit and N-1 gain stage circuit, wherein N is the integer greater than 1, the input voltage of operational amplifier directly links to each other with a described N input stage circuit, the output of n input stage circuit is linked the input of n gain stage circuit, n≤N wherein, after amplifying, be connected with the output of n+1 input stage circuit again, be connected to the input of n+1 gain stage circuit then, after the output of the output of N input stage circuit and N-1 gain stage circuit is connected the most at last, be connected to the input of output-stage circuit; Described input stage circuit is made up of two identical MOS transistor and three constant-current sources with gain stage circuit, the input loading power voltage of one of them constant-current source, and output is connected with the source electrode of described two MOS transistor respectively, and the drain electrode of described two MOS transistor is respectively by two other constant-current source ground connection; Described input voltage is received the grid of described two MOS transistor in all input stage circuits, the voltage of exporting from the transistor of n input stage circuit is connected to transistorized grid n the gain stage circuit respectively, after amplifying, be connected addition with the source electrode output of n+1 input stage circuit respectively again, and the signal after the addition is delivered to transistorized grid in n+1 the gain stage circuit respectively.
3. operational amplifier that method adopted of realizing that voltage signal as claimed in claim 1 amplifies, it is characterized in that: described operational amplifier comprises N input stage circuit and N-1 gain stage circuit, wherein N is the integer greater than 1, the input voltage of operational amplifier directly links to each other with a described N input stage circuit, the output of n input stage circuit is linked the input of n gain stage circuit, n≤N wherein, after amplifying, be connected with the output of n+1 input stage circuit again, be connected to the input of n+1 gain stage circuit then, after the output of the output of N input stage circuit and N-1 gain stage circuit is connected the most at last, be connected to the input of output-stage circuit; Described input stage circuit is made up of two identical triodes and three constant-current sources with gain stage circuit, the input loading power voltage of one of them constant-current source, and output is connected with the emitter of described two triodes respectively, and the collector electrode of described two triodes is respectively by two other constant-current source ground connection; Described input voltage is received the base stage of described two triodes in all input stage circuits, be connected to the base stage of triode n the gain stage circuit respectively from the voltage of the triode of n input stage circuit output, after amplifying, be connected addition with the collector electrode output of n+1 input stage circuit respectively again, and the signal after the addition delivered to the base stage of triode in n+1 the gain stage circuit respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100940356A CN101373954B (en) | 2007-08-24 | 2007-08-24 | Method for amplifying voltage signal and operational amplifier |
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| CN2007100940356A CN101373954B (en) | 2007-08-24 | 2007-08-24 | Method for amplifying voltage signal and operational amplifier |
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| CN101373954A CN101373954A (en) | 2009-02-25 |
| CN101373954B true CN101373954B (en) | 2010-09-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102927998A (en) * | 2012-11-21 | 2013-02-13 | 昆山北极光电子科技有限公司 | Multi-channel vibration noise filtering method |
| CN111262531B (en) * | 2020-01-31 | 2024-03-01 | 京东方科技集团股份有限公司 | Detection circuit, manufacturing method thereof and detection panel |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5412344A (en) * | 1993-11-19 | 1995-05-02 | Gec Plessey Semiconductor, Inc. | Class AB amplifier with improved phase margin |
| US6456162B1 (en) * | 1999-08-09 | 2002-09-24 | Stmicroelectronics S.A. | Operational amplifier with offset voltage centering, and low-voltage compatible |
| CN1636319A (en) * | 2000-10-10 | 2005-07-06 | 高通股份有限公司 | Gain linearizer for variable gain amplifiers |
| CN1921310A (en) * | 2005-06-02 | 2007-02-28 | 威盛电子股份有限公司 | Comparator with multiple gain stages |
-
2007
- 2007-08-24 CN CN2007100940356A patent/CN101373954B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5412344A (en) * | 1993-11-19 | 1995-05-02 | Gec Plessey Semiconductor, Inc. | Class AB amplifier with improved phase margin |
| US6456162B1 (en) * | 1999-08-09 | 2002-09-24 | Stmicroelectronics S.A. | Operational amplifier with offset voltage centering, and low-voltage compatible |
| CN1636319A (en) * | 2000-10-10 | 2005-07-06 | 高通股份有限公司 | Gain linearizer for variable gain amplifiers |
| CN1921310A (en) * | 2005-06-02 | 2007-02-28 | 威盛电子股份有限公司 | Comparator with multiple gain stages |
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