JPS5635514A - Gain control amplifier - Google Patents
Gain control amplifierInfo
- Publication number
- JPS5635514A JPS5635514A JP11108779A JP11108779A JPS5635514A JP S5635514 A JPS5635514 A JP S5635514A JP 11108779 A JP11108779 A JP 11108779A JP 11108779 A JP11108779 A JP 11108779A JP S5635514 A JPS5635514 A JP S5635514A
- Authority
- JP
- Japan
- Prior art keywords
- offset voltage
- source
- gain control
- temperature
- resistance
- 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
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/02—Manually-operated control
Landscapes
- Control Of Amplification And Gain Control (AREA)
Abstract
PURPOSE:To suppress the fluctuation of the offset voltage due to the change of temperature and at the same time carrying out a gain control with a low impedance, by obtaining the offset voltage of the gain control amplifier by an adequate resistance. CONSTITUTION:The output of the DC bias power source E1 is applied to the constant current source IB via the resistance R8 as well as to the emitter-follower circuit 12. The color signal is supplied to the differential amplifier 13 from the input terminal 14, and the output color signal is led out through the output terminal 15. The resistance R8 to function to apply the offset voltage is connected to the source IB for bias. And thus an optional offset voltage (IBXR8) can be obtained by varying the value of the reisistance R8 or the current IB of the source IB. Also the compensation of temperature is added to the source IB to suppress the fluctuation of the offset voltage due to the change of temperature.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11108779A JPS5635514A (en) | 1979-08-31 | 1979-08-31 | Gain control amplifier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11108779A JPS5635514A (en) | 1979-08-31 | 1979-08-31 | Gain control amplifier |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5635514A true JPS5635514A (en) | 1981-04-08 |
Family
ID=14552046
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11108779A Pending JPS5635514A (en) | 1979-08-31 | 1979-08-31 | Gain control amplifier |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5635514A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5728412A (en) * | 1980-07-29 | 1982-02-16 | Nec Corp | Gain control circuit |
JPH0246013A (en) * | 1988-08-06 | 1990-02-15 | Mitsubishi Electric Corp | Gain variable amplifier circuit |
JPH02137508A (en) * | 1988-11-18 | 1990-05-25 | Toshiba Corp | Gain control circuit |
JP2003060456A (en) * | 2001-08-16 | 2003-02-28 | Matsushita Electric Ind Co Ltd | Variable gain amplifier circuit |
-
1979
- 1979-08-31 JP JP11108779A patent/JPS5635514A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5728412A (en) * | 1980-07-29 | 1982-02-16 | Nec Corp | Gain control circuit |
JPS6337965B2 (en) * | 1980-07-29 | 1988-07-27 | Nippon Denki Kk | |
JPH0246013A (en) * | 1988-08-06 | 1990-02-15 | Mitsubishi Electric Corp | Gain variable amplifier circuit |
JPH02137508A (en) * | 1988-11-18 | 1990-05-25 | Toshiba Corp | Gain control circuit |
JP2003060456A (en) * | 2001-08-16 | 2003-02-28 | Matsushita Electric Ind Co Ltd | Variable gain amplifier circuit |
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