CN102832938A - Analog-to-digital converter (ADC) circuit for current input - Google Patents
Analog-to-digital converter (ADC) circuit for current input Download PDFInfo
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- CN102832938A CN102832938A CN2012103211927A CN201210321192A CN102832938A CN 102832938 A CN102832938 A CN 102832938A CN 2012103211927 A CN2012103211927 A CN 2012103211927A CN 201210321192 A CN201210321192 A CN 201210321192A CN 102832938 A CN102832938 A CN 102832938A
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- integrator
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Abstract
The invention discloses an analog-to-digital converter (ADC) circuit for current input, which comprises an integrator, a sampling holding circuit and an ADC unit; the integrator, the sampling holding circuit and the ADC unit are connected in series sequentially; a first switch is arranged between the integrator and the sampling holding circuit; the integrator is composed of a first amplifier and a first capacitor; a reverse input end of the amplifier is electrically connected with a constant current source, and a same-directional input end is earthed; the output end of the first amplifier is electrically connected with the same-directional input end of the second amplifier; the first capacitor is connected with the first amplifier in parallel; a second switch is connected between a reverse input end and a constant current source of the first amplifier in series; the sampling holding circuit is composed of a second amplifier and a second capacitor electrically connected with the earth; the reverse input end of the second amplifier is electrically connected with the output end of the second amplifier; the second capacitor is electrically connected with the output end of the second amplifier; the ADC unit is electrically connected with the output end of the second amplifier, so that the ADC circuit with the current input is only provided with one integrator; therefore, the ADC circuit has the advantages of being low in energy consumption and high in current precision.
Description
Technical field
The present invention relates to a kind of adc circuit, be specifically related to a kind of adc circuit of electric current input.
Background technology
With reference to figure 1, because the continuity of current integration, the ADC (analog to digital converter) of existing electric current input generally includes two integrators 13,15, and 14, two integrators in an ADC unit 13,15 integration in turn.Its operation principle is: two integrators 13,15 take turns to operate in integral mode, in some cycles, if first integrator 15 is operated in integral mode; At next cycle, first integrator meeting 15 just can be broken off the switch of input in the maintenance pattern so; Open the switch of output; Do analog-to-digital conversion, and another integrator 13 can be operated in integral mode, repeatedly with this.So just guaranteed lasting sampling, also made ADC unit 14 have time enough to do digital-to-analogue conversion input current.Yet there are following two major defects in it: the first, need two integrators 13,15, and increased power consumption; The second, two integrator 13,15 has mismatch, makes to introduce error, thereby influenced the precision of whole electric current greatly.
Summary of the invention
For solving the problems of the technologies described above, the invention provides the adc circuit of the electric current input that a kind of energy consumption is low, current precision is high.
For achieving the above object, technical scheme of the present invention is following:
A kind of adc circuit of electric current input comprises integrator, sampling hold circuit, and the ADC unit; Integrator, sampling hold circuit, and the series connection of ADC sequence of unit; Be provided with switch one between integrator and the sampling hold circuit.
Preferably, integrator is made up of amplifier one and electric capacity one; There is a constant-current source reverse input end Electricity Federation of amplifier one, and it is input end grounding in the same way, the Electricity Federation of input in the same way of the output of amplifier one and amplifier two; Electric capacity one is parallelly connected with amplifier one.
Preferably, tandem tap two between the reverse input end of amplifier one and the constant-current source.
Preferably, sampling hold circuit constitutes by amplifier two with the electric capacity two of Electricity Federation, ground; Amplifier two reverse input ends and its output Electricity Federation; The output Electricity Federation of electric capacity two and amplifier two.
Preferably, the output Electricity Federation of ADC unit and amplifier two.
Through technique scheme, the adc circuit of a kind of electric current input provided by the invention, it comprises constant-current source, integrator, sampling hold circuit, and the ADC unit; Constant-current source, integrator, sampling hold circuit, and the series connection of ADC sequence of unit; Be provided with switch between integrator and the sampling hold circuit; It is thus clear that the adc circuit of electric current input provided by the present invention has only an integrator, so it has the advantage that energy consumption is low, current precision is high.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below.
Fig. 1 is the circuit diagram of the adc circuit of the disclosed a kind of electric current input of prior art;
Fig. 2 is the circuit diagram of the adc circuit of the disclosed a kind of electric current input of the embodiment of the invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention will be carried out clear, intactly description.
The invention provides a kind of adc circuit of electric current input, with reference to figure 2, it comprises integrator 2 devices, sampling hold circuit 3, and ADC unit 4; Integrator 2, sampling hold circuit 3, and the 4 order series connection of ADC unit; Be provided with switch 1 between integrator 2 and the sampling hold circuit 3.Integrator 2 is made up of amplifier 1 and electric capacity 1; The reverse input end 52 and the constant-current source 1 of amplifier 1 are electrically connected, and it is input 51 ground connection in the same way, the output 53 of amplifier 1 and 61 Electricity Federations of input in the same way of amplifier 26; Electric capacity 1 is parallelly connected with amplifier 1.Tandem tap 28 between the reverse input end 52 of amplifier 1 and the constant-current source 1.Sampling hold circuit 3 constitutes by amplifier 26 with the electric capacity 2 22 of Electricity Federation, ground; Amplifier 26 reverse input ends 62 and its output 63 Electricity Federations; Output 63 Electricity Federations of electric capacity 2 22 and amplifier 26.Output 63 Electricity Federations of ADC unit 4 and amplifier 26.It is thus clear that the adc circuit of this electric current input has only an integrator 2, so it has the advantage that energy consumption is low, current precision is high.
The operation principle of the adc circuit of a kind of electric current input provided by the present invention is: in first cycle, integrator 2 operate as normal are when one-period finishes; Sampling hold circuit 3 work; Sample integrator 2 output voltages on the electric capacity 2 22, at second period, integrator 2 is integration again; And analog converter can be to sampling hold circuit 3 sustaining voltages, and analog-to-digital conversion is done in the output of first cyclic integrator 2 just.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments among this paper.Therefore, the present invention will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (5)
1. the adc circuit of an electric current input is characterized in that, comprises integrator, sampling hold circuit, and the ADC unit; Said integrator, sampling hold circuit, and the series connection of ADC sequence of unit; Be provided with switch one between said integrator and the said sampling hold circuit.
2. the adc circuit of a kind of electric current input according to claim 1 is characterized in that said integrator is made up of amplifier one and electric capacity one; There is constant-current source the reverse input end Electricity Federation of said amplifier one, and it is input end grounding in the same way, the Electricity Federation of input in the same way of the output of said amplifier one and said amplifier two; Said electric capacity one is parallelly connected with said amplifier one.
3. the adc circuit of a kind of electric current input according to claim 2 is characterized in that tandem tap two between the reverse input end of said amplifier one and the said constant-current source.
4. according to the adc circuit of the described a kind of electric current input of claim 3, it is characterized in that said sampling hold circuit constitutes by amplifier two with the electric capacity two of Electricity Federation, ground; Said amplifier two reverse input ends and its output Electricity Federation; The output Electricity Federation of said electric capacity two and said amplifier two.
5. according to the adc circuit of the described a kind of electric current input of claim 4, it is characterized in that the output Electricity Federation of said ADC unit and said amplifier two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103211927A CN102832938A (en) | 2012-09-03 | 2012-09-03 | Analog-to-digital converter (ADC) circuit for current input |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103211927A CN102832938A (en) | 2012-09-03 | 2012-09-03 | Analog-to-digital converter (ADC) circuit for current input |
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| Publication Number | Publication Date |
|---|---|
| CN102832938A true CN102832938A (en) | 2012-12-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN2012103211927A Pending CN102832938A (en) | 2012-09-03 | 2012-09-03 | Analog-to-digital converter (ADC) circuit for current input |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091561A (en) * | 2012-12-26 | 2013-05-08 | 常州同惠电子股份有限公司 | Device obtaining direct current signals from alternative current and direct current superposition signals and method thereof |
Citations (6)
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| CN1295736A (en) * | 1998-01-05 | 2001-05-16 | 摩托罗拉公司 | Circuit and method for reducing sampling noise |
| CN1611954A (en) * | 2003-10-31 | 2005-05-04 | 浩威科技有限公司 | Thin film transistor display array measuring circuit and method |
| JP2006148814A (en) * | 2004-11-24 | 2006-06-08 | Toyota Motor Corp | Processing method and processing circuit for sensor signal |
| CN101394182A (en) * | 2007-02-26 | 2009-03-25 | 国家半导体公司 | Charge balancing method in current input ADC |
| US20100013688A1 (en) * | 2007-01-26 | 2010-01-21 | Panasonic Electric Device Co., Ltd. | Sigma-delta type analog-to-digital (ad) converter and angular velocity sensor using same |
| CN202841102U (en) * | 2012-09-03 | 2013-03-27 | 江苏国石半导体有限公司 | Current input ADC circuit |
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2012
- 2012-09-03 CN CN2012103211927A patent/CN102832938A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1295736A (en) * | 1998-01-05 | 2001-05-16 | 摩托罗拉公司 | Circuit and method for reducing sampling noise |
| CN1611954A (en) * | 2003-10-31 | 2005-05-04 | 浩威科技有限公司 | Thin film transistor display array measuring circuit and method |
| JP2006148814A (en) * | 2004-11-24 | 2006-06-08 | Toyota Motor Corp | Processing method and processing circuit for sensor signal |
| US20100013688A1 (en) * | 2007-01-26 | 2010-01-21 | Panasonic Electric Device Co., Ltd. | Sigma-delta type analog-to-digital (ad) converter and angular velocity sensor using same |
| CN101394182A (en) * | 2007-02-26 | 2009-03-25 | 国家半导体公司 | Charge balancing method in current input ADC |
| CN202841102U (en) * | 2012-09-03 | 2013-03-27 | 江苏国石半导体有限公司 | Current input ADC circuit |
Non-Patent Citations (1)
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| 蔡成涛等: "《微机接口原理及应用技术》", 31 August 2011, 哈尔滨工程大学出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091561A (en) * | 2012-12-26 | 2013-05-08 | 常州同惠电子股份有限公司 | Device obtaining direct current signals from alternative current and direct current superposition signals and method thereof |
| CN103091561B (en) * | 2012-12-26 | 2015-02-11 | 常州同惠电子股份有限公司 | Device obtaining direct current signals from alternative current and direct current superposition signals and method thereof |
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Application publication date: 20121219 |