CN102118134A - Novel instrument amplifier - Google Patents
Novel instrument amplifier Download PDFInfo
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- CN102118134A CN102118134A CN2009101556803A CN200910155680A CN102118134A CN 102118134 A CN102118134 A CN 102118134A CN 2009101556803 A CN2009101556803 A CN 2009101556803A CN 200910155680 A CN200910155680 A CN 200910155680A CN 102118134 A CN102118134 A CN 102118134A
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- nmos switch
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Abstract
The invention relates to an instrument, in particular to an instrument amplifier. The instrument amplifier comprises a differential amplifier, wherein the differential amplifier is provided with an input channel and a feedback channel. The instrument amplifier is characterized in that both the input channel and the feedback channel pass through a multi-path selection circuit controlled by a clock signal; the input terminal of the input channel and the input terminal of the feedback channel are exchanged on time, so that mismatching errors for the transconductances of the two input terminals are moved to a high-frequency position, and the transconductances of the two input terminals are matched in a low-frequency position.
Description
Technical field
The present invention relates to a kind of instrument, especially relate to a kind of instrument amplifier.
Background technology
Differential differential amplifier is a kind of broad-spectrum amplifier, its a kind of purposes is to realize instrument amplifier, as shown in Figure 1, than the instrument amplifier of traditional resistance feedback, the instrument amplifier of realizing with differential differential amplifier has very high common-mode rejection ratio.
Use the gain table of the instrument amplifier of differential differential amplifier realization to be shown:
As can be seen, except resistance had influenced gain, the matching of two inputs of differential differential amplifier had also influenced the gain of instrument amplifier, and specifically, not matching of the mutual conductance of two inputs determined the error of gain.Not matching of two inputs also worsened the Linearity of instrument amplifier.
Publication number is the gain error correction that the Chinese patent of CN1981432 discloses a kind of current-mode instrumentation amplifier, it comprises that with separately with input first and second input amplifiers that are coupled of node and be arranged to respond the difference input voltage that puts on the input node and produce separately electric current, this electric current and output node are coupled.In order to reduce the present invention includes the gain correction circuit that is coupled with IA owing to constitute on the sheet of input amplifier and/or the device that sheet is outer and/or the caused gain error of parasitic capacitance of structure.This gain correction circuit is reproducible to the small part parasitic capacitance and to the IA electric current that affords redress, to reduce the producing gain error relevant with input and output.
But this correcting circuit is owing to influenced by offset current, and the error after it is proofreaied and correct still can be bigger, and the Amplifier Gain effect also can be subjected to the influence of offset current.Therefore it also comparatively bothers in control.
Summary of the invention
The present invention mainly is the technical problem that solves that the existing in prior technology error is big, influencing factor is many, control bothers etc., provides that a kind of error is little, influencing factor is few, controls novel easily instrument amplifier.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals: a kind of novel instrument amplifier, comprise differential amplifier circuit, differential amplifier circuit has input channel and feedback channel, it is characterized in that described input channel and feedback channel are all by a multiplexer circuit by clock signal control.Input signal Vin and feedback signal Vf enter a multiplexer circuit, and this multiplexer circuit is controlled by a clock signal fd, and when fd was high level, Vin connected input channel, and Vf connects feedback channel; When fd was low level, Vin connected feedback channel, and Vf connects input channel.Not matching of gm1 and gm2 is transferred to fd frequency place, final filtered device filtering.Two inputs are timed exchange, and therefore not matching of two input mutual conductances is moved to high frequency treatment, thereby makes the mutual conductance of two inputs reach coupling at the low frequency place.The mutual conductance that moves to high frequency treatment does not match error finally by the filter filtering.Can reduce the gain error of instrument amplifier in this way, also improve the Linearity of instrument amplifier.Because the input mutual conductance that Vin saw, half the time is gm1, and second half time is gm2, and therefore, on average, input Vin has seen the mean value of gm1 and gm2, i.e. (gm1+gm2)/2; Vf is identical situation for feedback.
As preferably, a kind of novel instrument amplifier according to claim 1, it is characterized in that described multiplexer circuit is provided with the nmos switch that is series at input channel and feedback channel both positive and negative polarity respectively, the output of the corresponding nmos switch of extremely going up with feedback channel of input of the nmos switch on the described input channel positive and negative electrode links to each other; The input of the corresponding nmos switch of extremely going up with feedback channel of output of the nmos switch on the described input channel positive and negative electrode links to each other, and described clock signal circuit links to each other with nmos switch respectively.
The beneficial effect that brings of the present invention is, solved that the existing in prior technology error is big, influencing factor is many, the technical problem of control trouble etc., realized that a kind of error is little, influencing factor is few, controls novel easily instrument amplifier.
Description of drawings
Accompanying drawing 1 is a kind of structural representation of the present invention;
Accompanying drawing 2 is a kind of structural representations of multiplexer circuit of the present invention;
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment:
As shown in Figure 1 and Figure 2, the present invention is a kind of novel instrument amplifier, comprises differential amplifier circuit, and differential amplifier circuit has input channel and feedback channel, and described input channel and feedback channel are all by a multiplexer circuit by clock signal control.Described multiplexer circuit is provided with the nmos switch that is series at input channel and feedback channel both positive and negative polarity respectively, and the output of the corresponding nmos switch of extremely going up with feedback channel of input of the nmos switch on the described input channel positive and negative electrode links to each other; The input of the corresponding nmos switch of extremely going up with feedback channel of output of the nmos switch on the described input channel positive and negative electrode links to each other, and described clock signal circuit links to each other with nmos switch respectively.
Input signal Vin and feedback signal Vf enter a multiplexer circuit, and this multiplexer circuit is controlled by a clock signal fd, and when fd was high level, Vin connected input channel, and Vf connects feedback; When fd was low level, Vin connected feedback channel, and Vf connects input channel.Not matching of gm1 and gm2 is transferred to fd frequency place, final filtered device filtering.Two inputs are timed exchange, and therefore not matching of two input mutual conductances is moved to high frequency treatment, thereby makes the mutual conductance of two inputs reach coupling at the low frequency place.The mutual conductance that moves to high frequency treatment does not match error finally by the filter filtering.Can reduce the gain error of instrument amplifier in this way, also improve the Linearity of instrument amplifier.Because the input mutual conductance that Vin saw, half the time is gm1, and second half time is gm2, and therefore, on average, input Vin has seen the mean value of gm1 and gm2, i.e. (gm1+gm2)/2; Vf is identical situation for feedback.
Features such as error is little, influencing factor is few so the present invention has, and control is convenient.
Claims (2)
1. a novel instrument amplifier comprises differential amplifier circuit, and differential amplifier circuit has input channel and feedback channel, it is characterized in that described input channel and feedback channel are all by a multiplexer circuit by clock signal control.
2. a kind of novel instrument amplifier according to claim 1, it is characterized in that described multiplexer circuit is provided with the nmos switch that is series at input channel and feedback channel both positive and negative polarity respectively, the output of the corresponding nmos switch of extremely going up with feedback channel of input of the nmos switch on the described input channel positive and negative electrode links to each other; The input of the corresponding nmos switch of extremely going up with feedback channel of output of the nmos switch on the described input channel positive and negative electrode links to each other, and described clock signal circuit links to each other with nmos switch respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101556803A CN102118134A (en) | 2009-12-31 | 2009-12-31 | Novel instrument amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101556803A CN102118134A (en) | 2009-12-31 | 2009-12-31 | Novel instrument amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102118134A true CN102118134A (en) | 2011-07-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101556803A Pending CN102118134A (en) | 2009-12-31 | 2009-12-31 | Novel instrument amplifier |
Country Status (1)
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| CN (1) | CN102118134A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108667439A (en) * | 2017-04-01 | 2018-10-16 | 杭州晶华微电子有限公司 | A kind of Novel low power consumption High Precision Low Temperature drift RC oscillators |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1476168A (en) * | 2002-08-13 | 2004-02-18 | 财团法人工业技术研究院 | Frequeney regulation loop used for transduce capacity filter |
| US20080018393A1 (en) * | 2006-07-07 | 2008-01-24 | Yamaha Corporation | Offset voltage correction circuit and class D amplifier |
| CN101467383A (en) * | 2006-06-14 | 2009-06-24 | 高通股份有限公司 | A glitch-free clock signal multiplexer circuit and method of operation thereof |
| CN201323554Y (en) * | 2008-10-07 | 2009-10-07 | 比亚迪股份有限公司 | Gain auxiliary amplifying circuit |
-
2009
- 2009-12-31 CN CN2009101556803A patent/CN102118134A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1476168A (en) * | 2002-08-13 | 2004-02-18 | 财团法人工业技术研究院 | Frequeney regulation loop used for transduce capacity filter |
| CN101467383A (en) * | 2006-06-14 | 2009-06-24 | 高通股份有限公司 | A glitch-free clock signal multiplexer circuit and method of operation thereof |
| US20080018393A1 (en) * | 2006-07-07 | 2008-01-24 | Yamaha Corporation | Offset voltage correction circuit and class D amplifier |
| CN201323554Y (en) * | 2008-10-07 | 2009-10-07 | 比亚迪股份有限公司 | Gain auxiliary amplifying circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108667439A (en) * | 2017-04-01 | 2018-10-16 | 杭州晶华微电子有限公司 | A kind of Novel low power consumption High Precision Low Temperature drift RC oscillators |
| CN108667439B (en) * | 2017-04-01 | 2021-08-31 | 杭州晶华微电子股份有限公司 | Novel low-power-consumption high-precision low-temperature-drift RC oscillator |
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Application publication date: 20110706 |