CN202841102U - Current input ADC circuit - Google Patents
Current input ADC circuit Download PDFInfo
- Publication number
- CN202841102U CN202841102U CN 201220444381 CN201220444381U CN202841102U CN 202841102 U CN202841102 U CN 202841102U CN 201220444381 CN201220444381 CN 201220444381 CN 201220444381 U CN201220444381 U CN 201220444381U CN 202841102 U CN202841102 U CN 202841102U
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- amplifier
- integrator
- adc
- circuit
- hold circuit
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Abstract
The utility model discloses a current input ADC circuit including an integrator, a sample hold circuit and an ADC unit. The integrator, the sample hold circuit and the ADC unit are connected successively in series. A switch 1 is arranged between the integrator and the sample hold circuit. The integrator is composed of an amplifier and 1 a capacitor 1. A constant current source is connected with a reverse input terminal of the amplifier 1 electrically and a synthetic input terminal of the amplifier is in ground connection. An output terminal of the amplifier 1 is connected with a synthetic input terminal of an amplifier 2 electrically. The capacitor 1 is connected with the amplifier 1. A switch 2 is connected between a reverse output terminal of the amplifier 1 and the constant current source. The sample hold circuit is composed of the amplifier 2 and a capacitor 2 connected with ground electrically. A reverse input terminal of the amplifier 2 is connected with an output terminal of the amplifier 2 electrically. The capacitor 2 is connected with the output terminal of the amplifier 2 electrically. The ADC unit is connected with the output terminal of the amplifier 2. Therefore, since the current input ADC circuit is provided with the only one integrator, the current input ADC circuit has advantages of low power consumption and high 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, and since the continuity of current integration, the ADC(analog to digital converter of existing electric current input) generally include two integrators 13,15, and 14, two integrators 13 in an ADC unit, 15 are understood in turn integration.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 namely can disconnect the switch of input at Holdover mode so, open the switch of output, do analog-to-digital conversion, and another integrator 13 can be operated in integral mode, with this repeatedly.So just guaranteed the lasting sampling to input current, also made ADC unit 14 have time enough to do digital-to-analogue conversion.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, so that introduce error, thus greatly affected the precision of whole electric current.
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 as follows:
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 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 in the same way input Electricity Federation of the output of amplifier one and amplifier two; Electric capacity one is in parallel with amplifier one.
Preferably, tandem tap two between the reverse input end of amplifier one and the constant-current source.
Preferably, sampling hold circuit consists of 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.
By 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; As seen, the adc circuit of electric current input provided by the utility model only has an integrator, therefore it has advantages of 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, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art.
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
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described.
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 of amplifier 1 and electric capacity 1; 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 in the same way input 61 Electricity Federations of amplifier 26; Electric capacity 1 is in parallel 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 consists of 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.As seen, the adc circuit of this electric current input only has an integrator 2, therefore it has advantages of 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 normal operations, when one-period finishes, sampling hold circuit 3 work, integrator 2 output voltages are sampled on the electric capacity 2 22, and at second period, integrator 2 is integration again, and analog converter can keep voltage to sampling hold circuit 3, and analog-to-digital conversion is done in the namely output of first cyclic integrator 2.
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 apparent concerning those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from the spirit or scope of the present invention, in other embodiments realization.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (5)
1. the adc circuit of an electric current input is characterized in that, comprises integrator, sampling hold circuit, and the ADC unit; Described integrator, sampling hold circuit, and the series connection of ADC sequence of unit; Be provided with switch one between described integrator and the described sampling hold circuit.
2. the adc circuit of a kind of electric current input according to claim 1 is characterized in that, described integrator is made of amplifier one and electric capacity one; There is constant-current source the reverse input end Electricity Federation of described amplifier one, and it is input end grounding in the same way, the in the same way input Electricity Federation of the output of described amplifier one and described amplifier two; Described electric capacity one is in parallel with described 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 described amplifier one and the described constant-current source.
4. according to the adc circuit of a kind of electric current input claimed in claim 3, it is characterized in that, described sampling hold circuit consists of by amplifier two with the electric capacity two of Electricity Federation, ground; Described amplifier two reverse input ends and its output Electricity Federation; The output Electricity Federation of described electric capacity two and described amplifier two.
5. according to the adc circuit of a kind of electric current input claimed in claim 4, it is characterized in that the output Electricity Federation of described ADC unit and described amplifier two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220444381 CN202841102U (en) | 2012-09-03 | 2012-09-03 | Current input ADC circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220444381 CN202841102U (en) | 2012-09-03 | 2012-09-03 | Current input ADC circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202841102U true CN202841102U (en) | 2013-03-27 |
Family
ID=47952696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220444381 Expired - Fee Related CN202841102U (en) | 2012-09-03 | 2012-09-03 | Current input ADC circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202841102U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832938A (en) * | 2012-09-03 | 2012-12-19 | 江苏国石半导体有限公司 | Analog-to-digital converter (ADC) circuit for current input |
| CN108494407A (en) * | 2018-05-24 | 2018-09-04 | 佛山科学技术学院 | A kind of conversion circuit of voltage to the time |
-
2012
- 2012-09-03 CN CN 201220444381 patent/CN202841102U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832938A (en) * | 2012-09-03 | 2012-12-19 | 江苏国石半导体有限公司 | Analog-to-digital converter (ADC) circuit for current input |
| CN108494407A (en) * | 2018-05-24 | 2018-09-04 | 佛山科学技术学院 | A kind of conversion circuit of voltage to the time |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130327 Termination date: 20150903 |
|
| EXPY | Termination of patent right or utility model |