CN107547052B - Embedded multiplier and operational amplifier - Google Patents
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Abstract
The embodiment of the invention provides an embedded multiplier and an operational amplifier. Wherein the operational amplifier includes: a first stage amplifier and a second stage amplifier, the embedded multiplier comprising: the current conversion module and the current amplification module. The input end of the current conversion module is connected with the output end of the second-stage amplifier, the output end of the current conversion module is respectively connected with the input end of the current amplification module and the output end of the first-stage amplifier, and the output end of the current amplification module is connected with the input end of the second-stage amplifier. The embedded multiplier realizes the power compensation of the operational amplifier by collecting and amplifying the current signal output by the second-stage amplifier, does not need extra voltage allowance, effectively avoids consuming the static power of the operational amplifier, and further avoids the offset voltage generated by the operational amplifier, thereby effectively increasing the working stability of the operational amplifier.
Description
Technical Field
The invention relates to the technical field of electronic power equipment, in particular to an embedded multiplier and an operational amplifier.
Background
With the development and improvement of science and technology, electronic equipment in the technical field of electronic power has been greatly developed and improved.
Operational amplifiers are widely used in various electronic circuits to amplify signals in the circuit. Currently, power compensation may be used to ensure operational stability of an operational amplifier, such as classical miller compensation. However, the power compensation method adopted at present requires additional voltage margin, and consumes static power of the operational amplifier, so that the operational amplifier generates offset voltage, which further affects the stability of operation of the operational amplifier under specific conditions.
Therefore, how to effectively ensure the working stability of the operational amplifier is a great problem in the industry.
Disclosure of Invention
Accordingly, the present invention is directed to an embedded multiplier and an operational amplifier for effectively improving the above-mentioned drawbacks.
The technical scheme for solving the technical problems is as follows:
In a first aspect, an embodiment of the present invention provides an embedded multiplier applied to an operational amplifier, the operational amplifier including: a first stage amplifier and a second stage amplifier, the embedded multiplier comprising: the current conversion module and the current amplification module. The input end of the current conversion module is connected with the output end of the second-stage amplifier, the output end of the current conversion module is respectively connected with the input end of the current amplification module and the output end of the first-stage amplifier, and the output end of the current amplification module is connected with the input end of the second-stage amplifier. The current conversion module is used for converting and amplifying the current signal output by the second-stage amplifier into a compensation current signal and outputting the compensation current signal to the current amplification module. The current amplifying module is used for acquiring a current signal output by the first-stage amplifier, compensating and amplifying the current signal according to the compensation current signal, and then outputting the current signal to the second-stage amplifier.
Further, the current conversion module includes: IV conversion circuitry and VI conversion circuitry. The input end of the IV conversion circuit is connected with the output end of the second-stage amplifier, the output end of the IV conversion circuit is connected with the input end of the VI conversion circuit, and the output end of the VI conversion circuit is respectively connected with the input end of the current amplification module and the output end of the first-stage amplifier. The IV conversion circuit is used for converting and amplifying the current signal output by the second-stage amplifier into a compensation voltage signal and outputting the compensation voltage signal to the VI conversion circuit. And the VI conversion circuit is used for converting and amplifying the compensation voltage signal into the compensation current signal and outputting the compensation current signal to the current amplification module.
Further, the IV conversion circuit includes: the first resistor, the first power supply and the first switching tube. One end of the first resistor is connected with the output end of the second-stage amplifier and the control end of the first switching tube respectively, the output end of the first switching tube and the first power supply are connected with the other end of the first resistor, the grounding end of the first switching tube is grounded, and the output end of the first switching tube is connected with the input end of the VI conversion circuit.
Further, the IV conversion circuit further includes: and one end of the first capacitor is connected with the output end of the second-stage amplifier, and the other end of the first capacitor is connected with one end of the first resistor.
Further, the first switch tube is a first field effect tube, the gate of the first field effect tube is the control end of the first switch tube, the source electrode of the first field effect tube is the grounding end of the first switch tube, and the drain electrode of the first field effect tube is the output end of the first switch tube.
Further, the first power supply is a first current source.
Further, the VI conversion circuit includes: a second power supply and a second switching tube. The control end of the second switching tube is connected with the output end of the IV conversion circuit, the output end of the second switching tube is connected with the second power supply, and the output end of the second switching tube is respectively connected with the input end of the current amplifying module and the output end of the first-stage amplifier.
Further, the second switching tube is a second field effect tube, the gate of the second field effect tube is the control end of the second switching tube, the source electrode of the second field effect tube is the grounding end of the second switching tube, and the drain electrode of the second field effect tube is the output end of the second switching tube.
Further, the second power supply is a second current source.
In a second aspect, an embodiment of the present invention provides an operational amplifier, including: the embedded multiplier is respectively connected with the output end of the first-stage amplifier, the input end of the second-stage amplifier and the output end of the second-stage amplifier.
The embodiment of the invention has the beneficial effects that:
the current conversion module is used for collecting the current signal output by the second-stage amplifier and converting and amplifying the current signal into a compensation current signal. And the current amplifying module compensates and amplifies the current signal output by the first-stage amplifier according to the compensation current signal. The embedded multiplier realizes the power compensation of the operational amplifier by collecting and amplifying the current signal output by the second-stage amplifier, does not need extra voltage allowance, effectively avoids consuming the static power of the operational amplifier, and further avoids the offset voltage generated by the operational amplifier, thereby effectively increasing the working stability of the operational amplifier.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the embodiments of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings. Like reference numerals refer to like parts throughout the several views of the drawings. The drawings are not intended to be drawn to scale, with emphasis instead being placed upon illustrating the principles of the invention.
Fig. 1 shows a block diagram of an operational amplifier according to a first embodiment of the present invention;
FIG. 2 shows a block diagram of an embedded multiplier provided by a second embodiment of the present invention;
FIG. 3 is a circuit diagram of a current conversion module in an embedded multiplier according to a second embodiment of the present invention;
fig. 4 shows a small-signal model equivalent circuit diagram of a current conversion module in a protection device according to a second embodiment of the present invention.
Icon: a 10-operational amplifier; 11-a first stage amplifier; 12-a second stage amplifier; 100-an embedded multiplier; 110-a current conversion module; a 111-IV conversion circuit; 112-VI conversion circuitry; 120-a current amplifying module.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, the terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance. In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "connected," "coupled," and "coupled" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
First embodiment
Referring to fig. 1, a first embodiment of the present invention provides an operational amplifier 10, the operational amplifier 10 comprising: a first stage amplifier 11, a second stage amplifier 12 and an embedded multiplier 100. The embedded multiplier 100 is connected to the output of the first-stage amplifier 11, the input of the second-stage amplifier 12, and the output of the second-stage amplifier 12, respectively.
In this embodiment, the embedded multiplier 100 acquires the current signal output by the second-stage amplifier 12, and amplifies and converts the current signal into a compensation current signal sequentially through I-V conversion and V-I conversion. When the embedded multiplier 100 acquires the current signal output from the first-stage amplifier 11, power compensation for the current signal is formed based on the compensated current signal, and the compensated current signal is output to the second-stage amplifier 12, so that the second-stage amplifier 12 amplifies the current signal and outputs the amplified current signal. It can be appreciated that, through the feedback compensation adjustment formed by the embedded multiplier 100, when the power compensation of the operational amplifier 10 is realized, no additional voltage margin is needed, so that the static power of the operational amplifier 10 is effectively avoided being consumed, and further, the offset voltage generated by the operational amplifier 10 is avoided, and the working stability of the operational amplifier 10 is effectively increased.
Second embodiment
Referring to fig. 2, a second embodiment of the present invention provides an embedded multiplier 100, the embedded multiplier 100 comprising: a current conversion module 110 and a current amplification module 120. The input end of the current conversion module 110 is connected to the output end of the second-stage amplifier 12, the output end of the current conversion module 110 is connected to the input end of the current amplification module 120 and the output end of the first-stage amplifier 11, and the output end of the current amplification module 120 is connected to the input end of the second-stage amplifier 12.
The current conversion module 110 is configured to convert and amplify the current signal output by the second stage amplifier 12 into a compensation current signal through I-V and V-I conversion, so as to output the compensation current signal to the current amplification module 120.
The current amplifying module 120 is configured to obtain a current signal output by the first stage amplifier 11, compensate and amplify the current signal according to the obtained compensation current signal and its amplifying circuit, and then output the compensated and amplified current signal to the second stage amplifier 12.
Referring to fig. 2, the current conversion module 110 includes: IV conversion circuit 111 and VI conversion circuit 112. The input end of the IV conversion circuit 111 is connected to the output end of the second stage amplifier 12, the output end of the IV conversion circuit 111 is connected to the input end of the VI conversion circuit 112, and the output end of the VI conversion circuit 112 is connected to the input end of the current amplification module 120 and the output end of the first stage amplifier 11, respectively.
As shown in fig. 2 and 3, the IV conversion circuit 111 is configured to convert and amplify the current signal output from the second stage amplifier 12 into a compensation voltage signal, and then output the compensation voltage signal to the VI conversion circuit 112.
In the IV conversion circuit 111 of the present embodiment, the IV conversion circuit 111 includes: the first capacitor C1, the first resistor R1, the first power supply Is1 and the first switching tube MOS1. The first power supply Is1 Is a first current source Is1, and the first switching tube MOS1 Is a first field effect tube MOS1. The grid electrode of the first field effect transistor MOS1 is a control end of the first switch transistor MOS1, the source electrode of the first field effect transistor MOS1 is a grounding end of the first switch transistor MOS1, and the drain electrode of the first field effect transistor MOS1 is an output end of the first switch transistor MOS1.
Specifically, one end of the first capacitor C1 is an input end of the IV conversion circuit 111, that is, an input end of the current conversion module 110, and a connection port A1 connected to an output end of the second-stage amplifier 12 is provided. The other end of the first capacitor C1 is connected to one end of the first resistor R1. One end of the first resistor R1 Is connected with the control end of the first switching tube MOS1, the output end of the first switching tube MOS1 and the first power supply Is1 are both connected with the other end of the first resistor R1, the grounding end of the first switching tube MOS1 Is grounded, and the output end of the first switching tube MOS1 Is connected with the input end of the VI conversion circuit 112.
The IV conversion circuit 111 converts the current signal output from the second-stage amplifier 12 into a voltage signal through the connection relationship described above, and loads the voltage signal to the control terminal of the first switching transistor MOS 1. The first switching tube MOS1 Is in a conducting amplifying state according to the current input by the first power supply Is 1. The first switching tube MOS1 amplifies the voltage signal into a compensation voltage signal, and loads the compensation voltage signal to the input terminal of the VI conversion circuit 112.
As shown in fig. 2 and 3, the VI conversion circuit 112 is configured to convert and amplify the compensation voltage signal into a compensation current signal, and output the compensation current signal to the current amplification module 120.
In the VI conversion circuit 112 of the present embodiment, the VI conversion circuit 112 includes: a second power supply Is2 and a second switching tube MOS2. The second power supply Is2 Is a second current source Is2, and the second switching tube MOS2 Is a second field effect tube MOS2. The grid electrode of the second field effect transistor MOS2 is the control end of the second switch transistor MOS2, the source electrode of the second field effect transistor MOS2 is the grounding end of the second switch transistor MOS2, and the drain electrode of the second field effect transistor MOS2 is the output end of the second switch transistor MOS2.
Specifically, the control end of the second switching tube MOS2 is connected to the output end of the IV conversion circuit 111, and the output end of the second switching tube MOS2 is connected to the second power supply. The output of the second switching tube MOS2 is also used as the output of the VI conversion circuit 112, i.e. also as the output of the current conversion module 110, and is provided with a connection port A2 connected to the input of the current amplification module 120 and the output of the first stage amplifier 11, respectively.
The VI conversion circuit 112 obtains the compensation voltage signal from the control terminal of the second switching tube MOS2 through the connection relationship described above. The second switching tube MOS2 Is also in a conducting and amplifying state according to the current input by the second power supply Is2, and further the second switching tube MOS2 converts and amplifies the compensation voltage signal into a compensation current signal, and outputs the compensation current signal to the input end of the current amplifying module 120.
Referring to fig. 2, the current amplifying module 120 may be an integrated circuit chip having an amplifying circuit therein. The current amplifying module 120 acquires a current signal output from the first stage amplifier 11. In addition, the current amplifying module 120 also obtains the compensation current signal output by the current converting module 110. The current amplifying module 120 inputs both the compensation current signal and the current signal into its amplifying circuit so that the compensation current signal and the current signal are superimposed. The current signal is amplified and output through the amplifying circuit, and meanwhile, the power compensation of the current signal is formed by compensating the current signal.
Referring to fig. 4, fig. 4 is an equivalent circuit diagram of the small signal model of the current conversion module 110. Wherein Rb represents the first resistor R1, cb represents the first capacitor C1, gmb1 represents the transconductance of the first switching tube, -kGmb1 represents the transconductance of the second switching tube, cgs1 represents the parasitic capacitance of the control end of the first switching tube, gob1 represents the parasitic capacitance of the output end of the first switching tube, cpb1 represents the output capacitance of the output end of the second switching tube, gob2 represents the parasitic capacitance of the output end of the second switching tube, and Cpb1 represents the output capacitance of the output end of the second switching tube.
In the case of Cb > Cgs1, cpb1 and (1/Gob 1) > > Rb > (1/Gmb1), the transmission equation for CM is about:
Where m=k (Gmb 1×rb-1) represents a multiplication factor, a0 represents Gmb1/Cb, and a1 represents 1/(rb×cpb1). The equivalent bandwidth BCM of the current conversion module 110 is defined as: the phase drops at a frequency of 45 ° and, in addition, from 90 ° to 45 ° for the positive current conversion module 110 and from-90 ° to-135 ° for the negative C current conversion module 110. Thus, BCM can be determined by the formula (9):
the solution (9) formula is available, and BCM is:
It can be derived from equation 10 that the poles, whether they are two real numbers or two complex numbers, are independent of their pole type. Since the effective capacitance is a dead constraint, BCM can be increased by increasing the value of a0, i.e. by increasing Rb while decreasing the value of Cb, to make full use of the parasitic capacitance Cpb. For example, when the local loop stability requirement is a1 greater than or equal to 2a0, BCM is greater than or equal to 0.732a0, i.e., 0.732=gmb1/Cb.
In addition, with respect to the power budget for the current conversion module 110, in this embodiment, the paranoid current can be precisely derived by the transconductance of all the transistors. For example, the total transconductance of the current conversion module 110 is 2Gmb1. The bandwidth BCM-1 of the current conversion module 110 may be as follows:
As is available from equation 11, the current conversion module 110 of the present embodiment is better in frequency performance because M must be set to be greater than 1 to achieve capacitive amplification.
To sum up: the embodiment of the invention provides an embedded multiplier and an operational amplifier. Wherein the operational amplifier includes: a first stage amplifier and a second stage amplifier, the embedded multiplier comprising: the current conversion module and the current amplification module. The input end of the current conversion module is connected with the output end of the second-stage amplifier, the output end of the current conversion module is respectively connected with the input end of the current amplification module and the output end of the first-stage amplifier, and the output end of the current amplification module is connected with the input end of the second-stage amplifier.
The current conversion module is used for collecting the current signal output by the second-stage amplifier and converting and amplifying the current signal into a compensation current signal. And the current amplifying module compensates and amplifies the current signal output by the first-stage amplifier according to the compensation current signal. The embedded multiplier realizes the power compensation of the operational amplifier by collecting and amplifying the current signal output by the second-stage amplifier, does not need extra voltage allowance, effectively avoids consuming the static power of the operational amplifier, and further avoids the offset voltage generated by the operational amplifier, thereby effectively increasing the working stability of the operational amplifier.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. An embedded multiplier for use in an operational amplifier, the operational amplifier comprising: a first stage amplifier and a second stage amplifier, the embedded multiplier comprising: a current conversion module and a current amplification module; the input end of the current conversion module is connected with the output end of the second-stage amplifier, the output end of the current conversion module is respectively connected with the input end of the current amplification module and the output end of the first-stage amplifier, and the output end of the current amplification module is connected with the input end of the second-stage amplifier;
the current conversion module is used for converting and amplifying the current signal output by the second-stage amplifier into a compensation current signal and outputting the compensation current signal to the current amplification module;
The current amplifying module is used for acquiring a current signal output by the first-stage amplifier, compensating and amplifying the current signal according to the compensation current signal, and then outputting the current signal to the second-stage amplifier;
The current conversion module includes: the input end of the IV conversion circuit is connected with the output end of the second-stage amplifier, the output end of the IV conversion circuit is connected with the input end of the VI conversion circuit, and the output end of the VI conversion circuit is respectively connected with the input end of the current amplification module and the output end of the first-stage amplifier;
The IV conversion circuit is used for converting and amplifying the current signal output by the second-stage amplifier into a compensation voltage signal and outputting the compensation voltage signal to the VI conversion circuit;
the VI conversion circuit is used for converting and amplifying the compensation voltage signal into the compensation current signal and outputting the compensation current signal to the current amplification module;
the IV conversion circuit includes: the power supply circuit comprises a first resistor, a first power supply and a first switching tube, wherein one end of the first resistor is respectively connected with the output end of the second-stage amplifier and the control end of the first switching tube, the output end of the first switching tube and the first power supply are both connected with the other end of the first resistor, the grounding end of the first switching tube is grounded, and the output end of the first switching tube is connected with the input end of the VI conversion circuit;
The IV conversion circuit further includes: one end of the first capacitor is connected with the output end of the second-stage amplifier, and the other end of the first capacitor is connected with one end of the first resistor;
The first switch tube is a first field effect tube, the gate of the first field effect tube is the control end of the first switch tube, the source electrode of the first field effect tube is the grounding end of the first switch tube, and the drain electrode of the first field effect tube is the output end of the first switch tube.
2. The embedded multiplier of claim 1, in which the first power source is a first current source.
3. The embedded multiplier of claim 1, wherein the VI conversion circuit comprises: the control end of the second switching tube is connected with the output end of the IV conversion circuit, the output end of the second switching tube is connected with the second power supply, and the output end of the second switching tube is respectively connected with the input end of the current amplification module and the output end of the first-stage amplifier.
4. The embedded multiplier of claim 3, wherein the second switching tube is a second field effect tube, a gate of the second field effect tube is a control terminal of the second switching tube, a source of the second field effect tube is a ground terminal of the second switching tube, and a drain of the second field effect tube is an output terminal of the second switching tube.
5. The embedded multiplier of claim 3, wherein the second power source is a second current source.
6. An operational amplifier, the operational amplifier comprising: a first stage amplifier, a second stage amplifier and an embedded multiplier according to any one of claims 1-5, said embedded multiplier being connected to the output of said first stage amplifier, the input of said second stage amplifier and the output of said second stage amplifier, respectively.
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| JP2003037449A (en) * | 2001-07-24 | 2003-02-07 | Rikogaku Shinkokai | Operational amplifier |
| CN101277094A (en) * | 2007-03-29 | 2008-10-01 | 联詠科技股份有限公司 | Operation amplifier capable of compensating migration voltage |
| CN101677230A (en) * | 2008-09-15 | 2010-03-24 | 联发科技（新加坡）私人有限公司 | three-stage frequency-compensated operational amplifier |
| CN104393846A (en) * | 2014-11-17 | 2015-03-04 | 上海华虹宏力半导体制造有限公司 | Operational amplifier |
| CN204408278U (en) * | 2015-02-17 | 2015-06-17 | 王玲 | A kind of medical photoelectric detection preamplifier circuit |
| CN106330114A (en) * | 2016-08-15 | 2017-01-11 | 深圳市蓝狮微电子有限公司 | Amplifier circuit and frequency compensation method |
| CN207354221U (en) * | 2017-08-23 | 2018-05-11 | 刘欣亮 | Embedded multiplier and operational amplifier |
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2017
- 2017-08-23 CN CN201710734690.7A patent/CN107547052B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003037449A (en) * | 2001-07-24 | 2003-02-07 | Rikogaku Shinkokai | Operational amplifier |
| CN101277094A (en) * | 2007-03-29 | 2008-10-01 | 联詠科技股份有限公司 | Operation amplifier capable of compensating migration voltage |
| CN101677230A (en) * | 2008-09-15 | 2010-03-24 | 联发科技（新加坡）私人有限公司 | three-stage frequency-compensated operational amplifier |
| CN104393846A (en) * | 2014-11-17 | 2015-03-04 | 上海华虹宏力半导体制造有限公司 | Operational amplifier |
| CN204408278U (en) * | 2015-02-17 | 2015-06-17 | 王玲 | A kind of medical photoelectric detection preamplifier circuit |
| CN106330114A (en) * | 2016-08-15 | 2017-01-11 | 深圳市蓝狮微电子有限公司 | Amplifier circuit and frequency compensation method |
| CN207354221U (en) * | 2017-08-23 | 2018-05-11 | 刘欣亮 | Embedded multiplier and operational amplifier |
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