JPS5488017A - Gain control circuit - Google Patents
Gain control circuitInfo
- Publication number
- JPS5488017A JPS5488017A JP15552977A JP15552977A JPS5488017A JP S5488017 A JPS5488017 A JP S5488017A JP 15552977 A JP15552977 A JP 15552977A JP 15552977 A JP15552977 A JP 15552977A JP S5488017 A JPS5488017 A JP S5488017A
- Authority
- JP
- Japan
- Prior art keywords
- input signal
- gain
- signal
- current
- output
- 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
- Control Of Amplification And Gain Control (AREA)
Abstract
PURPOSE: To improve the linearity of the gain-controlled output signal as well as to reduce the power consumption of the circuit by setting the output impedance of the constant voltage source to a fixed low level regardless of the input signal.
CONSTITUTION: The input signal to be supplied to the base of transistor TR11 is voltage-divided by the emitter output and via resistance 12 and 18 plus TR19 to be supplied to the base of TR20. Accordingly, the internal impedance of TR20 is varies by the input signal, and the collector current is controlled by the input signal with its scale proportional to the input signal current. Then the input signal level increases, and the internal impedance of TR20 is lowered by the increment of the signal current flowing through gain variable resistance 13, with no change of the emitter potential and current given to TR14. As a result, the power consumption can be reduced for the circuit without imparing the linearity of the gain-controlled output signal.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15552977A JPS5488017A (en) | 1977-12-26 | 1977-12-26 | Gain control circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15552977A JPS5488017A (en) | 1977-12-26 | 1977-12-26 | Gain control circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5488017A true JPS5488017A (en) | 1979-07-12 |
Family
ID=15608053
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15552977A Pending JPS5488017A (en) | 1977-12-26 | 1977-12-26 | Gain control circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5488017A (en) |
-
1977
- 1977-12-26 JP JP15552977A patent/JPS5488017A/en active Pending
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