JPS5515123A - Light signal receiver - Google Patents
Light signal receiverInfo
- Publication number
- JPS5515123A JPS5515123A JP8726478A JP8726478A JPS5515123A JP S5515123 A JPS5515123 A JP S5515123A JP 8726478 A JP8726478 A JP 8726478A JP 8726478 A JP8726478 A JP 8726478A JP S5515123 A JPS5515123 A JP S5515123A
- Authority
- JP
- Japan
- Prior art keywords
- input end
- inversion input
- amplifier
- feedback
- comparator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/693—Arrangements for optimizing the preamplifier in the receiver
- H04B10/6931—Automatic gain control of the preamplifier
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Abstract
PURPOSE:To prolong the time constant of peak values by feeding the output signal of a peak detector back to the inversion input end of a differential amplifier and making the feedback ratio thereof equal to the inverse number of the non-feedback gain from the non-inversion input end of the differential amplifier up to the input end of a comparator. CONSTITUTION:Light signal received in a photo detector 11 is fetched out as an electric signal which is then converted to voltage by a load resistance RL. This voltage is applied to the non-inversion input end of a differential amplifier 12. The output signal thereof is applied to the non-inversion input end of a comparator 13, where it is subjected to level comparison with a reference input Eref. The peak detector 14 constituted by a series circuit of a diode Dp and capacitor Cp detects the output peak value of the amplifier 12 and feeds it back to the inversion input end of the amplifier 12 via feedback circuit 15 consisting of resistances R1, R2. The feedback ratio of the feedback circuit 15 is set approximately equal to the inverse number of the non-feedback gain from the non-inversion input end of the amplifier 12 up to the non-inversion input end of the comparator 13. In this way, the light signal receiver of the prolonged holding time constant of peak values may be obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8726478A JPS5515123A (en) | 1978-07-18 | 1978-07-18 | Light signal receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8726478A JPS5515123A (en) | 1978-07-18 | 1978-07-18 | Light signal receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5515123A true JPS5515123A (en) | 1980-02-02 |
Family
ID=13909903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8726478A Pending JPS5515123A (en) | 1978-07-18 | 1978-07-18 | Light signal receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5515123A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2579045A1 (en) * | 1985-03-14 | 1986-09-19 | Bull Sa | OPTOELECTRONIC TRANSDUCER |
| JPS63305720A (en) * | 1987-06-06 | 1988-12-13 | Fanuc Ltd | Ripple removing circuit |
-
1978
- 1978-07-18 JP JP8726478A patent/JPS5515123A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2579045A1 (en) * | 1985-03-14 | 1986-09-19 | Bull Sa | OPTOELECTRONIC TRANSDUCER |
| JPS63305720A (en) * | 1987-06-06 | 1988-12-13 | Fanuc Ltd | Ripple removing circuit |
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