JPS55113383A - Light receiving circuit - Google Patents
Light receiving circuitInfo
- Publication number
- JPS55113383A JPS55113383A JP2009579A JP2009579A JPS55113383A JP S55113383 A JPS55113383 A JP S55113383A JP 2009579 A JP2009579 A JP 2009579A JP 2009579 A JP2009579 A JP 2009579A JP S55113383 A JPS55113383 A JP S55113383A
- Authority
- JP
- Japan
- Prior art keywords
- amplifier amp
- component
- circuit
- discriminant
- photodetector
- 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
Landscapes
- Light Receiving Elements (AREA)
- Optical Communication System (AREA)
Abstract
PURPOSE: To produce a discriminant regenerative signal having constant amplitude from a light receiving circuit in a simple configuration by automatically controlling the gain of the circuit for the AC component of its photodetector and automatically controlling the level of the circuit for the DC component thereof.
CONSTITUTION: When a light input level to a photodetector D1 becomes high, a DC amplifier AMP produces higher output, which is partially applied through a low pass filter to a resistor R2. Thus, the resistance of the resistor R2 becomes low, and the amplifier AMP thus produces a lower output. When the light input level to the photodetector D1, on the other hand, becomes low, the DC amplifier AMP produces lower output. Thus, the amplifier AMP automatically controls its gain with respect to the AC component of the input signal. However, the amplifier AMP does not control its gain with respect to the DC component of the input signal. However, a circuit network of a capacitor C3 and resistors R3∼R6 rectifies the mean value of the DC component of the input signal. A comparator COMP compares the mean rectified value with the output of the amplifier AMP to produce a discriminant regenerative signal. Therefore, the comparator COMP can produce the discriminant regenerative signal having cnstant amplitude.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009579A JPS55113383A (en) | 1979-02-22 | 1979-02-22 | Light receiving circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009579A JPS55113383A (en) | 1979-02-22 | 1979-02-22 | Light receiving circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55113383A true JPS55113383A (en) | 1980-09-01 |
Family
ID=12017545
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2009579A Pending JPS55113383A (en) | 1979-02-22 | 1979-02-22 | Light receiving circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55113383A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59226527A (en) * | 1983-06-08 | 1984-12-19 | Oki Electric Ind Co Ltd | Circuit for suppressing dc variation |
JPS61212933A (en) * | 1985-03-14 | 1986-09-20 | ブル・ソシエテ・アノニム | Electrooptic transducer |
-
1979
- 1979-02-22 JP JP2009579A patent/JPS55113383A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59226527A (en) * | 1983-06-08 | 1984-12-19 | Oki Electric Ind Co Ltd | Circuit for suppressing dc variation |
JPH0532934B2 (en) * | 1983-06-08 | 1993-05-18 | Oki Electric Ind Co Ltd | |
JPS61212933A (en) * | 1985-03-14 | 1986-09-20 | ブル・ソシエテ・アノニム | Electrooptic transducer |
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