JPS57111112A - Variable gain amplifier - Google Patents
Variable gain amplifierInfo
- Publication number
- JPS57111112A JPS57111112A JP15008781A JP15008781A JPS57111112A JP S57111112 A JPS57111112 A JP S57111112A JP 15008781 A JP15008781 A JP 15008781A JP 15008781 A JP15008781 A JP 15008781A JP S57111112 A JPS57111112 A JP S57111112A
- Authority
- JP
- Japan
- Prior art keywords
- deltai
- becomes
- current
- control
- collector current
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G1/00—Details of arrangements for controlling amplification
- H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
- H03G1/0035—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements
- H03G1/0082—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using bipolar transistor-type devices
Landscapes
- Control Of Amplification And Gain Control (AREA)
Abstract
PURPOSE:Not only to make this amplifier suitable for using as a muting circuit particularly but also to make it suitable for forming an integrated circuit, by compensating a variation of an AC component, caused by adding a control transistor. CONSTITUTION:For instance, when input signals of I+DELTAi and I+DELTAi is are supplied to input terminals 28, 29, respectively, and the current amplification factor is denoted by K, a collector current of the first and second transistor (TR) 14, 15 becomes K(I-DELTAi), and a collector current of the fourth and fifth TRs 18, 19 becomes K(I+DELTAi). Also, an emitter current of the first control TR25 becomes (1-K)(I-DELTAi), an emitter current of the second control TR26 becomes (1-K) (I+DELTAi), and a collector current of the third control TR27 becomes 2I(1-K)/ (1+beta). That is to say, the collector current of the TR27 is controlled by a control input signal applied to the base, and the amplification factor K is varied. In this case, since an AC component of a base current of the TRs 25, 26 is offset, no bad influence is exerted on the circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15008781A JPS5837722B2 (en) | 1981-09-22 | 1981-09-22 | variable gain amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15008781A JPS5837722B2 (en) | 1981-09-22 | 1981-09-22 | variable gain amplifier |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP49137168A Division JPS5836529B2 (en) | 1974-11-27 | 1974-11-27 | Kahenritokuzofukuki |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57111112A true JPS57111112A (en) | 1982-07-10 |
| JPS5837722B2 JPS5837722B2 (en) | 1983-08-18 |
Family
ID=15489224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15008781A Expired JPS5837722B2 (en) | 1981-09-22 | 1981-09-22 | variable gain amplifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5837722B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6093428U (en) * | 1983-11-30 | 1985-06-26 | タツタ電線株式会社 | Fireproof airtight penetration of electric wire cable |
| JPS6244615U (en) * | 1985-08-31 | 1987-03-18 | ||
| JPS6281418U (en) * | 1985-11-09 | 1987-05-25 |
-
1981
- 1981-09-22 JP JP15008781A patent/JPS5837722B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5837722B2 (en) | 1983-08-18 |
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