CN203225763U - Double-stage bandwidth-controlling light receiver with small output voltage deviation - Google Patents
Double-stage bandwidth-controlling light receiver with small output voltage deviation Download PDFInfo
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- CN203225763U CN203225763U CN 201320205811 CN201320205811U CN203225763U CN 203225763 U CN203225763 U CN 203225763U CN 201320205811 CN201320205811 CN 201320205811 CN 201320205811 U CN201320205811 U CN 201320205811U CN 203225763 U CN203225763 U CN 203225763U
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- 230000003287 optical effect Effects 0.000 claims description 24
- 239000003990 capacitor Substances 0.000 abstract description 17
- 230000003321 amplification Effects 0.000 abstract description 6
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 6
- 230000003750 conditioning effect Effects 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000013307 optical fiber Substances 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
- G01J1/46—Electric circuits using a capacitor
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Amplifiers (AREA)
Abstract
This utility model discloses a double-stage bandwidth controlling light receiver with small output voltage deviation, which comprises a photodiode, a double-stage high pass filter and a double- stage amplification circuit. Each stage of the series high pass filter circuit comprises two capacitors, two resistors and four switches. A signal output terminal of the photodiode is connected to the signal input terminals of a first stage high pass filter, a first stage amplification circuit, a second stage high pass filter and a second stage amplification circuit successively. A signal output terminal of the second stage amplification circuit is the signal output terminal of the light receiver. By adding switches in the high pass filter for controlling value or presence and absence of capacitance and resistance double-stage bandwidth controlling light receiver with small output voltage deviation can change frequency bandwidth of the output signal, achieve adjusting of bandwidth, realize signal conditioning and minimize distortion degree of signals. Furthermore, by adopting the double-stage high pass filter and the double-stage amplification circuit, more accurate bandwidth adjusting is achieved and small output voltage deviation is achieved as well.
Description
Technical field
The utility model relates to a kind of optical receiver, relates in particular to the optical receiver of the adjustable little output voltage deviation twin-stage control bandwidth of a kind of output signal bandwidth.
Background technology
Optical receiver is the equipment of receiving optical signals, generally includes photodetector, filter and amplifier.In optical fiber telecommunications system, the task of optical receiver is with the additional noise of minimum and distortion, recover after the Optical Fiber Transmission by the entrained information of light carrier, so the output characteristic concentrated expression of optical receiver the performance of whole optical fiber telecommunications system.
The light signal of optical sender emission is after transmission, and amplitude fading, and impulse waveform not only is broadening also, and the effect of optical receiver is exactly the faint optical signal that detects through transmission, and amplification, shaping, the former transmission signal of regeneration.
In the optical receiver, the main effect of photodetector is to utilize photoelectric effect that light signal is changed into the signal of telecommunication.In optical communication system, to the requirement of photodetector be highly sensitive, response is fast, noise is little, cost is low and reliability is high.The basic principle of Photoelectric Detection process is light absorption.At present, photodetector commonly used is photodiode, avalanche photodide in optical communication system.Because the signal that receives of optical receiver is very faint, in addition under the disturbed condition of high background noise field, can cause receiving terminal signal to noise ratio S/N＜1 again, so be very necessary to Signal Processing.Usually take filter and amplifier that the signal of telecommunication of photodetector output is handled.
The filter of existing optical receiver, generally take the permanent circuit structure to realize filtering, that is to say that its frequency filtering fixes, so the signal bandwidth of final output is fixed, be unfavorable for like this regulating to received signal, be difficult to accomplish with signal distortion drop to level off to minimum.
The utility model content
The purpose of this utility model just is to provide in order to address the above problem the optical receiver of the adjustable little output voltage deviation twin-stage control bandwidth of a kind of output signal bandwidth.
The utility model is achieved through the following technical solutions above-mentioned purpose:
The optical receiver of little output voltage deviation twin-stage control bandwidth described in the utility model comprises photodiode, high pass filter and amplifying circuit, described high pass filter comprises first electric capacity, second electric capacity, the 3rd electric capacity, the 4th electric capacity, first resistance, second resistance, the 5th resistance, the 6th resistance, first switch, second switch, the 3rd switch, the 4th switch, the 5th switch, the 6th switch, minion is closed and the 8th switch, described amplifying circuit comprises first amplifier, second amplifier, the 3rd resistance, the 4th resistance, the 7th resistance and the 8th resistance, the negative pole of described photodiode, first end of described first electric capacity and first end of described second electric capacity interconnect, second end of described first electric capacity is connected with first end of described first switch, second end of described second electric capacity, second end with described first switch of connecting behind the described second switch, first end of described first resistance is connected with first end of described second resistance, second end of described first resistance is connected with first end of described the 3rd switch, second end of described second resistance is connected and is connected with second end of described the 3rd switch and the positive signal input of described first amplifier simultaneously behind described the 4th switch, the output of described first amplifier, first end of described the 3rd resistance, first end of described the 3rd electric capacity and first end of described the 4th electric capacity interconnect, second end of described the 3rd resistance is connected with the negative signal input of described first amplifier and first end of described the 4th resistance simultaneously, second end of described the 3rd electric capacity is connected with first end of described the 5th switch, second end of described the 4th electric capacity, second end with described the 5th switch of connecting behind described the 6th switch, first end of described the 5th resistance is connected with first end of described the 6th resistance, second end of described the 5th resistance is connected with first end that described minion is closed, connect behind described the 8th switch simultaneously second end that closes with described minion and the positive signal input of described second amplifier of second end of described the 6th resistance is connected, the output of described second amplifier is connected with first end of described the 7th resistance, second end of described the 7th resistance is connected with the negative signal input of described second amplifier and first end of described the 8th resistance simultaneously, second end of described the 8th resistance, second end of described the 4th resistance and the positive pole of described photodiode interconnect, and second end of the output of described second amplifier and described the 8th resistance is the output of described optical receiver.
The beneficial effects of the utility model are:
The utility model is by increasing the big or small of switch control capacitance value, resistance value and having or not in high frequency filter, change the frequency bandwidth of output signal, the realization bandwidth is adjustable, is conducive to regulate to received signal, signal distortion is dropped to as far as possible level off to minimum; By adopting two-stage filtering and amplifying circuit, realize bandwidth adjustment more accurately, realize the purpose of little output voltage deviation simultaneously.
Description of drawings
Fig. 1 is the circuit diagram of the optical receiver of little output voltage deviation twin-stage control bandwidth described in the utility model.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing:
As shown in Figure 1, the optical receiver of little output voltage deviation twin-stage control bandwidth described in the utility model comprises photodiode VD, high pass filter and amplifying circuit, high pass filter comprises first capacitor C 1, second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, first resistance R 1, second resistance R 2, the 5th resistance R 5, the 6th resistance R 6, first K switch 1, second switch K2, the 3rd K switch 3, the 4th K switch 4, the 5th K switch 5, the 6th K switch 6, minion is closed K7 and the 8th switch K8, amplifying circuit comprises the first amplifier IC1, the second amplifier IC2, the 3rd resistance R 3, the 4th resistance R 4, the 7th resistance R 7 and the 8th resistance R 8, the negative pole of photodiode VD, first end of first end of first capacitor C 1 and second capacitor C 2 interconnects, second end of first capacitor C 1 is connected with first end of first K switch 1, behind second end of the second capacitor C 2 series connection second switch K2 with second end of first K switch 1, first end of first resistance R 1 is connected with first end of second resistance R 2, second end of first resistance R 1 is connected with first end of the 3rd K switch 3, second end of second resistance R 2 is connected 4 back connections with second end of the 3rd K switch 3 and the positive signal input of the first amplifier IC1 simultaneously of the 4th K switch, the output of the first amplifier IC1, first end of the 3rd resistance R 3, first end of first end of the 3rd capacitor C 3 and the 4th capacitor C 4 interconnects, second end of the 3rd resistance R 3 is connected with the negative signal input of the first amplifier IC1 and first end of the 4th resistance R 4 simultaneously, second end of the 3rd capacitor C 3 is connected with first end of the 5th K switch 5, second end of the 4th capacitor C 4 is connected the 6th K switch 6 afterwards and second end of the 5th K switch 5, first end of the 5th resistance R 5 is connected with first end of the 6th resistance R 6, second end of the 5th resistance R 5 is connected with first end that minion is closed K7, second end of the 6th resistance R 6 is connected and is closed second end of K7 with minion simultaneously behind the 8th switch K8 and the positive signal input of the second amplifier IC2 is connected, the output of the second amplifier IC2 is connected with first end of the 7th resistance R 7, second end of the 7th resistance R 7 is connected with the negative signal input of the second amplifier IC2 and first end of the 8th resistance R 8 simultaneously, second end of the 8th resistance R 8, second end of the 4th resistance R 4 and the positive pole of photodiode VD interconnect, and second end of the output of the second amplifier IC2 and the 8th resistance R 8 is the output Uo of described optical receiver.
As shown in Figure 1, first capacitor C 1, second capacitor C 2, first resistance R 1, second resistance R 2, first K switch 1, second switch K2, the 3rd K switch 3 and the 4th K switch 4 common first order high pass filters of forming, the first amplifier IC1, the 3rd resistance R 3 and the 4th resistance R 4 common first order amplifying circuits of forming, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th resistance R 5, the 6th resistance R 6, the 5th K switch 3, the 6th K switch 4, minion is closed K7 and the 8th switch K8 forms second level high pass filter, the second amplifier IC2 jointly, the 7th resistance R 7 and the 8th resistance R 8 common second level amplifying circuits of forming.By changing the on off state of first K switch 1, second switch K2, the 3rd K switch 3, the 4th K switch 4, the 5th K switch 5, the 6th K switch 6, minion pass K7 and the 8th switch K8, can change the size of capacitance and resistance value in first order high pass filter and the second level high pass filter and have or not, thereby change the cut-off frequency of filter, the bandwidth of amplifying the signal of output through amplifying circuit is also changed, therefore the output signal frequency bandwidth of optical receiver can be adjusted to the best, reduce signal distortion as far as possible.
Claims (1)
1. the optical receiver of one kind little output voltage deviation twin-stage control bandwidth, comprise photodiode, high pass filter and amplifying circuit, it is characterized in that: described high pass filter comprises first electric capacity, second electric capacity, the 3rd electric capacity, the 4th electric capacity, first resistance, second resistance, the 5th resistance, the 6th resistance, first switch, second switch, the 3rd switch, the 4th switch, the 5th switch, the 6th switch, minion is closed and the 8th switch, described amplifying circuit comprises first amplifier, second amplifier, the 3rd resistance, the 4th resistance, the 7th resistance and the 8th resistance, the negative pole of described photodiode, first end of described first electric capacity and first end of described second electric capacity interconnect, second end of described first electric capacity is connected with first end of described first switch, second end of described second electric capacity, second end with described first switch of connecting behind the described second switch, first end of described first resistance is connected with first end of described second resistance, second end of described first resistance is connected with first end of described the 3rd switch, second end of described second resistance is connected and is connected with second end of described the 3rd switch and the positive signal input of described first amplifier simultaneously behind described the 4th switch, the output of described first amplifier, first end of described the 3rd resistance, first end of described the 3rd electric capacity and first end of described the 4th electric capacity interconnect, second end of described the 3rd resistance is connected with the negative signal input of described first amplifier and first end of described the 4th resistance simultaneously, second end of described the 3rd electric capacity is connected with first end of described the 5th switch, second end of described the 4th electric capacity, second end with described the 5th switch of connecting behind described the 6th switch, first end of described the 5th resistance is connected with first end of described the 6th resistance, second end of described the 5th resistance is connected with first end that described minion is closed, connect behind described the 8th switch simultaneously second end that closes with described minion and the positive signal input of described second amplifier of second end of described the 6th resistance is connected, the output of described second amplifier is connected with first end of described the 7th resistance, second end of described the 7th resistance is connected with the negative signal input of described second amplifier and first end of described the 8th resistance simultaneously, second end of described the 8th resistance, second end of described the 4th resistance and the positive pole of described photodiode interconnect, and second end of the output of described second amplifier and described the 8th resistance is the output of described optical receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320205811 CN203225763U (en) | 2013-04-23 | 2013-04-23 | Double-stage bandwidth-controlling light receiver with small output voltage deviation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320205811 CN203225763U (en) | 2013-04-23 | 2013-04-23 | Double-stage bandwidth-controlling light receiver with small output voltage deviation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203225763U true CN203225763U (en) | 2013-10-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320205811 Expired - Fee Related CN203225763U (en) | 2013-04-23 | 2013-04-23 | Double-stage bandwidth-controlling light receiver with small output voltage deviation |
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| Country | Link |
|---|---|
| CN (1) | CN203225763U (en) |
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2013
- 2013-04-23 CN CN 201320205811 patent/CN203225763U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131002 Termination date: 20140423 |