CN204559542U - A kind of current-to-voltage converting circuit with inputting biased and active power filtering - Google Patents
A kind of current-to-voltage converting circuit with inputting biased and active power filtering Download PDFInfo
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- CN204559542U CN204559542U CN201520271763.XU CN201520271763U CN204559542U CN 204559542 U CN204559542 U CN 204559542U CN 201520271763 U CN201520271763 U CN 201520271763U CN 204559542 U CN204559542 U CN 204559542U
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- operational amplifier
- current
- biased
- bias current
- active power
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Abstract
The utility model discloses a kind of current-to-voltage converting circuit with inputting biased and active power filtering, comprising operational amplifier A 1 and bias current sources, current signal I
swith the reverse input end being connected to operational amplifier A 1 after bias current Ib parallel connection by resistance R4, the positive input of operational amplifier A 1 is connected to the ground and connects, the output of operational amplifier A 1 is connected with the reverse input end of operational amplifier A 1 by electric capacity C1, and the output of operational amplifier A 1 is connected to bias current sources and signal code I by negative feedback resistor R3
ssys node, this node shunt capacitance C2 over the ground simultaneously.It is biased that the utility model adopts current source to realize input, and realize active power filtering and electric current to voltage transitions by single operational amplifier, and circuit is simply, with low cost, has a good application prospect.
Description
Technical field
The utility model relates to a kind of current-to-voltage converting circuit with inputting biased and active power filtering, belongs to electronic circuit technology field.
Background technology
Because current signal has good antijamming capability, so a lot of transducers of industrial control field export as current signal, but, because multichannel unipolarity ADC cost performance is very high, for adapting to the range requirement of unipolarity ADC, carrying out being biased in the bipolar current signal of a lot of occasion needs sensor in future and be converted to unipolar signal, requiring that needs carry out low-pass filtering to meet sampling thheorem simultaneously.
At present, typical scheme is the current signal I that transducer exports
sfirst through the voltage transitions of current-to-voltage converting circuit settling signal, again through the skew of an adder settling signal, as shown in Figure 1, generally, current-to-voltage converting circuit and adder circuit are formed by amplifier, therefore this scheme needs to use two panels operational amplifier, need to do filtering process again to output signal if also had, need to increase a slice operational amplifier again toward contact, therefore, cause whole scheme cost higher, simultaneously, the space that also can take on printed circuit board, is unfavorable for cost control and the Miniaturization Design of circuit more.
Utility model content
The purpose of this utility model carries out needing multi-disc operational amplifier when being biased and being converted to unipolar signal to overcome existing bipolar current signal, the space taken on printed circuit board is large, is unfavorable for the cost control of circuit and the problem of Miniaturization Design needs.Current-to-voltage converting circuit with inputting biased and active power filtering of the present utility model, current source is adopted to realize input biased, and realize active power filtering and electric current to voltage transitions by single operational amplifier, and it is biased to realize multichannel signal polarity by mirror current source, circuit is simple, with low cost, have a good application prospect.
In order to achieve the above object, the technical scheme that the utility model adopts is:
Be biased the current-to-voltage converting circuit with active power filtering with input, it is characterized in that: comprise operational amplifier A 1 and bias current sources, current signal I
swith the reverse input end being connected to operational amplifier A 1 after bias current sources parallel connection by resistance R4, the positive input ground connection of operational amplifier A 1, the output of operational amplifier A 1 is connected with its reverse input end by electric capacity C1, and described bias current sources is used for realizing current signal I
sdirect current biasing, the output of described operational amplifier A 1 is also connected to bias current sources and signal code I by negative feedback resistor R3
son sys node, and be parallel with electric capacity C2 between this sys node and ground.
Aforesaid a kind of current-to-voltage converting circuit with inputting biased and active power filtering, it is characterized in that: described bias current sources comprises triode Q1, adjustable voltage a reference source U1, resistance R1 and resistance R2, the A pole of described adjustable voltage a reference source U1 is connected with power end Vcc by resistance R1, the A pole of described adjustable voltage a reference source U1 is also connected with the base stage of triode Q1, the K pole of described adjustable voltage a reference source U1 is connected to the ground and connects, the emitter of described triode Q1 is connected to the ground by resistance R2 and connects, the emitter of described triode Q1 is also connected with the R pole of adjustable voltage a reference source U1, the collector electrode of described triode Q1 is as the output of bias current sources and current input signal I
sbe in parallel.
The beneficial effects of the utility model are: the current-to-voltage converting circuit with inputting biased and active power filtering of the present utility model, current source is adopted to realize input biased, and realize active power filtering and electric current to voltage transitions by single operational amplifier, and it is biased to realize multichannel signal polarity by mirror current source, and have the following advantages
(1) use current source to carry out direct current biasing to input, biasing circuit equiva lent impedance is high, very little to signal code shunting;
(2) input is biased, active power filtering, electric current be to voltage transformation to adopt single operational amplifier to realize;
(3) circuit structure is simple, uses device few, is easy to integrated, has a good application prospect.
Accompanying drawing explanation
Fig. 1 is the system block diagram of traditional current-to-voltage converting circuit.
Fig. 2 is of the present utility model with inputting circuit diagram that the is biased and current-to-voltage converting circuit of active power filtering.
Fig. 3 is the circuit diagram of an embodiment of the present utility model.
Embodiment
Below in conjunction with Figure of description, the utility model is described in further detail.Following examples only for clearly the technical solution of the utility model being described, and can not limit protection range of the present utility model with this.
As shown in Figure 2, the current-to-voltage converting circuit with inputting biased and active power filtering of the present utility model, it comprises operational amplifier A 1 and bias current sources, current signal I
swith the reverse input end being connected to operational amplifier A 1 after bias current Ib parallel connection by resistance R4, the positive input ground connection of operational amplifier A 1, the output of operational amplifier A 1 is connected with its reverse input end by electric capacity C1, and described bias current sources is used for realizing current signal I
sdirect current biasing, the output of operational amplifier A 1 is connected to bias current Ib and signal code I by negative feedback resistor R3
son sys node, between this sys node and ground, be parallel with electric capacity C2.
As shown in Figure 3, an embodiment circuit of the present utility model, described bias current sources comprises triode Q1, adjustable voltage a reference source U1, resistance R1 and resistance R2, triode Q1 is NPN type triode, adjustable voltage a reference source U1 is suction-type adjustable voltage benchmark (as chip TI TL431 etc.), the A pole of adjustable voltage a reference source U1 is connected with power end Vcc by resistance R1, the A pole of described adjustable voltage a reference source U1 is also connected with the base stage of triode Q1, the K pole of described adjustable voltage a reference source U1 is connected to the ground and connects, the emitter of described triode Q1 is connected to the ground by resistance R2 and connects, the emitter of described triode Q1 is also connected with the R pole of adjustable voltage a reference source U1, the collector electrode of described triode Q1 is as the output of bias current sources and current signal I
sbe in parallel.
As follows according to the operation principle of the current-to-voltage converting circuit of above-mentioned and active power filtering biased with input:
Step (1), builds and is used for realizing current signal I
sthe bias current sources of direct current biasing, its current value I
bfor,
I
b＝V
ref/R
2(1)
Wherein, V
reffor the reference voltage that adjustable voltage a reference source U1 exports; R
2for reference resistance;
Step (2), current signal I
ssuperpose with the carrying out of bias current Ib, and the current signal after superposition is connected with the reverse input end of operational amplifier A 1 by resistance R4;
Step (3), by the output of operational amplifier A 1 by negative feedback resistor R3 and current signal I
s, bias current sources summing point be connected, and by the positive input ground connection of operational amplifier A 1, get the output U of operational amplifier A 1
ofor final output, then output voltage U
obe expressed as follows:
U
o＝-(I
s+I
b)R
3(2)
Wherein, R3 is the resistance of negative feedback resistor R3;
Step (4), is connected the output of operational amplifier A 1 with the reverse input end of operational amplifier A 1 by electric capacity C1, current signal I
s, be parallel with electric capacity C2 between the summing point of bias current sources and ground, form active low-pass filter circuit, by the size of regulating resistance R4, electric capacity C1, electric capacity C2, realize the bandwidth regulating low-pass filtering, output voltage U in Fig. 3
othe expression formula of complex frequency domain is as shown in formula (3).
In sum, the current-to-voltage converting circuit with inputting biased and active power filtering of the present utility model, has the following advantages, and 1) use current source to carry out direct current biasing to input, biasing circuit equiva lent impedance is high, very little to signal code shunting; 2) input is biased, active power filtering, electric current be to voltage transformation to adopt single operational amplifier to realize; 3) circuit structure is simple, uses device few, is easy to integrated, has a good application prospect.
More than show and describe general principle of the present utility model, principal character and advantage.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (2)
1. be biased the current-to-voltage converting circuit with active power filtering with input, it is characterized in that: comprise operational amplifier A 1 and bias current sources, current signal I
swith the reverse input end being connected to operational amplifier A 1 after bias current sources parallel connection by resistance R4, the positive input ground connection of operational amplifier A 1, the output of operational amplifier A 1 is connected with its reverse input end by electric capacity C1, and described bias current sources is used for realizing current signal I
sdirect current biasing, the output of described operational amplifier A 1 is also connected to bias current sources, current signal I by negative feedback resistor R3
son sys node, and be parallel with electric capacity C2 between this sys node and ground.
2. a kind of current-to-voltage converting circuit with inputting biased and active power filtering according to claim 1, it is characterized in that: described bias current sources comprises triode Q1, adjustable voltage a reference source U1, resistance R1 and resistance R2, the A pole of described adjustable voltage a reference source U1 is connected with power end Vcc by resistance R1, the A pole of described adjustable voltage a reference source U1 is also connected with the base stage of triode Q1, the K pole of described adjustable voltage a reference source U1 is connected to the ground and connects, the emitter of described triode Q1 is connected to the ground by resistance R2 and connects, the emitter of described triode Q1 is also connected with the R pole of adjustable voltage a reference source U1, the collector electrode of described triode Q1 is as the output of bias current sources and current input signal I
sbe in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520271763.XU CN204559542U (en) | 2015-04-29 | 2015-04-29 | A kind of current-to-voltage converting circuit with inputting biased and active power filtering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520271763.XU CN204559542U (en) | 2015-04-29 | 2015-04-29 | A kind of current-to-voltage converting circuit with inputting biased and active power filtering |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204559542U true CN204559542U (en) | 2015-08-12 |
Family
ID=53834611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520271763.XU Withdrawn - After Issue CN204559542U (en) | 2015-04-29 | 2015-04-29 | A kind of current-to-voltage converting circuit with inputting biased and active power filtering |
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| Country | Link |
|---|---|
| CN (1) | CN204559542U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104811181A (en) * | 2015-04-29 | 2015-07-29 | 南京磐能电力科技股份有限公司 | Current-to-voltage conversion circuit with input bias and active power filtering effects and current-to-voltage conversion method |
| CN107422178A (en) * | 2017-08-05 | 2017-12-01 | 海鹰企业集团有限责任公司 | A kind of transmitter that electric current is gone to voltage |
-
2015
- 2015-04-29 CN CN201520271763.XU patent/CN204559542U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104811181A (en) * | 2015-04-29 | 2015-07-29 | 南京磐能电力科技股份有限公司 | Current-to-voltage conversion circuit with input bias and active power filtering effects and current-to-voltage conversion method |
| CN104811181B (en) * | 2015-04-29 | 2017-09-15 | 南京磐能电力科技股份有限公司 | A kind of current-to-voltage converting circuit and method with input biasing and active power filtering |
| CN107422178A (en) * | 2017-08-05 | 2017-12-01 | 海鹰企业集团有限责任公司 | A kind of transmitter that electric current is gone to voltage |
| CN107422178B (en) * | 2017-08-05 | 2019-06-14 | 海鹰企业集团有限责任公司 | A kind of transmitter that electric current is gone to voltage |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150812 Effective date of abandoning: 20170915 |
|
| AV01 | Patent right actively abandoned |