JPS5776946A - Automatic gain control system - Google Patents
Automatic gain control systemInfo
- Publication number
- JPS5776946A JPS5776946A JP55151401A JP15140180A JPS5776946A JP S5776946 A JPS5776946 A JP S5776946A JP 55151401 A JP55151401 A JP 55151401A JP 15140180 A JP15140180 A JP 15140180A JP S5776946 A JPS5776946 A JP S5776946A
- Authority
- JP
- Japan
- Prior art keywords
- gain control
- control
- reference voltage
- gain
- apd1
- 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
-
- 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
- H04B10/691—Arrangements for optimizing the photodetector in the receiver
- H04B10/6911—Photodiode bias control, e.g. for compensating temperature variations
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Control Of Amplification And Gain Control (AREA)
- Optical Communication System (AREA)
Abstract
PURPOSE:To make easy the gain adjustment, by using a reference voltage used for automatic gain control as the gain control of an amplifier. CONSTITUTION:An output voltage of a reference voltage generating circuit 8 used for automatic gain control is also used for gain control of a comparison amplifier 6. Thus, at greater optical power, AGC is made with the gain control of the AGC amplifier 2 and at smaller optical power, a part of this reference voltage is used as the reference voltage for bias voltage control, and the bias voltage of an Avalanche photo diode APD1 is controlled, and the feedback amount of bias control to the APD1 is made for optimum bias control by matching the amount with the dispersion of the APD1 and changing the feedback gain. As a result, even if the APD has a dispersion, the gain adjustment is easy and the characteristics can be set optimizingly.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55151401A JPS5776946A (en) | 1980-10-30 | 1980-10-30 | Automatic gain control system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55151401A JPS5776946A (en) | 1980-10-30 | 1980-10-30 | Automatic gain control system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5776946A true JPS5776946A (en) | 1982-05-14 |
Family
ID=15517777
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55151401A Pending JPS5776946A (en) | 1980-10-30 | 1980-10-30 | Automatic gain control system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5776946A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59153313A (en) * | 1983-02-22 | 1984-09-01 | Nec Ic Microcomput Syst Ltd | Semiconductor integrated circuit |
JPS6220407A (en) * | 1985-07-19 | 1987-01-29 | Matsushita Electric Ind Co Ltd | Agc circuit for optical communication |
US5410363A (en) * | 1992-12-08 | 1995-04-25 | Lightwave Communications, Inc. | Automatic gain control device for transmitting video signals between two locations by use of a known reference pulse during vertical blanking period so as to control the gain of the video signals at the second location |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5370480A (en) * | 1976-12-06 | 1978-06-22 | Hitachi Ltd | Photo agc system |
-
1980
- 1980-10-30 JP JP55151401A patent/JPS5776946A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5370480A (en) * | 1976-12-06 | 1978-06-22 | Hitachi Ltd | Photo agc system |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59153313A (en) * | 1983-02-22 | 1984-09-01 | Nec Ic Microcomput Syst Ltd | Semiconductor integrated circuit |
JPS6220407A (en) * | 1985-07-19 | 1987-01-29 | Matsushita Electric Ind Co Ltd | Agc circuit for optical communication |
US5410363A (en) * | 1992-12-08 | 1995-04-25 | Lightwave Communications, Inc. | Automatic gain control device for transmitting video signals between two locations by use of a known reference pulse during vertical blanking period so as to control the gain of the video signals at the second location |
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