CN209231408U - A kind of preposition amplification protection circuit of Photoelectric Detection - Google Patents
A kind of preposition amplification protection circuit of Photoelectric Detection Download PDFInfo
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- CN209231408U CN209231408U CN201821843808.6U CN201821843808U CN209231408U CN 209231408 U CN209231408 U CN 209231408U CN 201821843808 U CN201821843808 U CN 201821843808U CN 209231408 U CN209231408 U CN 209231408U
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- operational amplifier
- resistance
- resistor
- photodiode
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Abstract
The utility model relates to a kind of preposition amplifications of Photoelectric Detection to protect circuit, including two operational amplifiers, four resistance, four capacitors and a photodiode, the positive input terminal of the connection of first resistor one end third capacitor and the first operational amplifier, the output end of the other end connection second operational amplifier of first resistor, the negative input end of first operational amplifier connects second resistance, the other end and third capacity earth of second resistance, photodiode is in parallel with third capacitor, 4th capacitor is in parallel with second resistance, the output end of first operational amplifier connects the negative input end of second operational amplifier by 3rd resistor, the positive input terminal of second operational amplifier is grounded, it is connected across between the negative input end of second operational amplifier and output end after second capacitor and the 4th resistance concatenation, first capacitor is in parallel with first resistor.This circuit structure is compact, and rationally, noise is low, stable and reliable operation, can be applied to high voltage optical fiber current sensor for design.
Description
Technical field
The utility model relates to technical field of circuit design more particularly to a kind of preposition amplification of Photoelectric Detection to protect circuit.
Background technique
It is exactly the useful signal being modulated on light carrier to be demodulated come realization optical signal to electricity using photoelectric detecting method
The conversion of signal.Because the optical signal of optical fiber connector output is usually very faint, the interference of various noises directly affects useful letter
Number measurement accuracy, this requires photodetectors within the scope of the launch wavelength of light source used with high-responsivity, small additional
Noise, the fast speed of response and enough bandwidth with data transfer rate required for capable of handling.In addition, what is be connected with detector is preposition
Amplifying circuit should also be as design rationally, and late-class circuit work is driven under the premise of meeting low noise.
Utility model content
In view of this, the purpose of the utility model is to provide a kind of preposition amplifications of Photoelectric Detection to protect circuit, it is existing to solve
There is the deficiency in technology.
In order to achieve the above object, the purpose of this utility model is achieved through the following technical solutions:
There is provided a kind of preposition amplification protection circuit of Photoelectric Detection, wherein including the first operational amplifier, the second operation amplifier
Device, first resistor, second resistance, 3rd resistor, the 4th resistance, first capacitor, the second capacitor, third capacitor, the 4th capacitor and
Photodiode, one end of the first resistor connect the third capacitor one end and first operational amplifier it is just defeated
Enter end, the other end of the first resistor connects the output end of the second operational amplifier, first operational amplifier
Negative input end connects one end of the second resistance, the other end difference of the other end of the second resistance and the third capacitor
Ground connection, the photodiode is in parallel with the third capacitor, and the 4th capacitor is in parallel with the second resistance, and described first
The output end of operational amplifier connects the negative input end of the second operational amplifier, second fortune by the 3rd resistor
The positive input terminal ground connection of amplifier is calculated, is connected across second operation amplifier after second capacitor and the 4th resistance concatenation
Between the negative input end of device and the output end of the second operational amplifier, the first capacitor is in parallel with the first resistor.
Circuit is protected in the above-mentioned preposition amplification of Photoelectric Detection, wherein the photodiode the selection of material is the PIN of InGaAs
Photodiode.
Circuit is protected in the above-mentioned preposition amplification of Photoelectric Detection, wherein first operational amplifier and second operation are put
Big device selects OPA129.
Compared with the prior art, the utility model has the beneficial effects that:
Which has a compact structure and a reasonable design, noise is low, stable and reliable operation, can be applied to high voltage optical fiber current sensor.
Detailed description of the invention
The attached drawing for constituting a part of the utility model is used to provide a further understanding of the present invention, this is practical new
The illustrative embodiments and their description of type are not constituteed improper limits to the present invention for explaining the utility model.?
In attached drawing:
Fig. 1 shows the structural schematic diagram of the utility model.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without creative efforts
Every other embodiment obtained, fall within the protection scope of the utility model.
It should be noted that in the absence of conflict, the feature in the embodiments of the present invention and embodiment can
To be combined with each other.
Refering to what is shown in Fig. 1, the utility model Photoelectric Detection preposition amplification protection circuit includes the first operational amplifier A1, the
Two operational amplifier A2, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, first capacitor C1, the second electricity
Hold one end of one end connection third capacitor C3 of C2, third capacitor C3, the 4th capacitor C4 and photodiode IL, first resistor R1
With the positive input terminal of the first operational amplifier A1, the other end of first resistor R1 connects the output end of second operational amplifier A2,
One end of the negative input end connection second resistance R2 of first operational amplifier A1, the other end and third capacitor C3 of second resistance R2
The other end be grounded respectively, photodiode IL is in parallel with third capacitor C3, and the 4th capacitor C4 is in parallel with second resistance R2, first
The output end of operational amplifier A1 passes through the negative input end of 3rd resistor R3 connection second operational amplifier A2, the second operation amplifier
The negative input of second operational amplifier A2 is connected across after the positive input terminal ground connection of device A2, the second capacitor C2 and the 4th resistance R4 concatenation
Between end and the output end of second operational amplifier A2, first capacitor C1 is in parallel with first resistor R1.In the technical program, photoelectricity
Diode IL the selection of material is the PIN photodiode of InGaAs, and receiving area is big, and sensitivity level is high, the first operational amplifier
A1 and second operational amplifier A2 select OPA129.Second resistance R2 is to compensate for missing because of the direct current caused by R1 is excessive
Difference, the shunt capacitance C4 on R2 is to remove the clutter noise on R2.It is required according to practical power frequency component, R1=2M can be taken
Ω, C1=800pF, R2=100k Ω, C4=0.1 μ F, R3=50k Ω, R4=1k Ω, C2=1 μ F.
From above-described embodiment as can be seen that the advantage of the utility model is:
Which has a compact structure and a reasonable design, noise is low, stable and reliable operation, can be applied to high voltage optical fiber current sensor.
Specific embodiment of the utility model is described in detail above, but the utility model be not restricted to it is above
The specific embodiment of description, it is merely an example.To those skilled in the art, any equivalent modifications and substitution be also all
Among the scope of the utility model.Therefore, equal transformation made under the spirit and scope for not departing from the utility model
And modification, should all it cover in the scope of the utility model.
Claims (3)
1. circuit is protected in a kind of preposition amplification of Photoelectric Detection, which is characterized in that including the first operational amplifier, the second operation amplifier
Device, first resistor, second resistance, 3rd resistor, the 4th resistance, first capacitor, the second capacitor, third capacitor, the 4th capacitor and
Photodiode, one end of the first resistor connect the third capacitor one end and first operational amplifier it is just defeated
Enter end, the other end of the first resistor connects the output end of the second operational amplifier, first operational amplifier
Negative input end connects one end of the second resistance, the other end difference of the other end of the second resistance and the third capacitor
Ground connection, the photodiode is in parallel with the third capacitor, and the 4th capacitor is in parallel with the second resistance, and described first
The output end of operational amplifier connects the negative input end of the second operational amplifier, second fortune by the 3rd resistor
The positive input terminal ground connection of amplifier is calculated, is connected across second operation amplifier after second capacitor and the 4th resistance concatenation
Between the negative input end of device and the output end of the second operational amplifier, the first capacitor is in parallel with the first resistor.
2. circuit is protected in the preposition amplification of Photoelectric Detection as described in claim 1, which is characterized in that the photodiode selects material
Material is the PIN photodiode of InGaAs.
3. circuit is protected in the preposition amplification of Photoelectric Detection as described in claim 1, which is characterized in that first operational amplifier and
The second operational amplifier selects OPA129.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821843808.6U CN209231408U (en) | 2018-11-09 | 2018-11-09 | A kind of preposition amplification protection circuit of Photoelectric Detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821843808.6U CN209231408U (en) | 2018-11-09 | 2018-11-09 | A kind of preposition amplification protection circuit of Photoelectric Detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209231408U true CN209231408U (en) | 2019-08-09 |
Family
ID=67502394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821843808.6U Active CN209231408U (en) | 2018-11-09 | 2018-11-09 | A kind of preposition amplification protection circuit of Photoelectric Detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209231408U (en) |
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2018
- 2018-11-09 CN CN201821843808.6U patent/CN209231408U/en active Active
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201230 Address after: Room 803, building 33, no.258, Xinzhuan Road, Songjiang high tech park, Caohejing Development Zone, Songjiang District, Shanghai, 201612 Patentee after: SHANGHAI WEIPAN MICROELECTRONIC Co.,Ltd. Address before: 201210 room 508, building B, 2305 Zuchongzhi Road, Pudong New Area pilot Free Trade Zone, Shanghai Patentee before: HUANYU (SHANGHAI) INTEGRATED CIRCUIT Co.,Ltd. |
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| TR01 | Transfer of patent right |