JPS56110312A - Diferential amplifier - Google Patents
Diferential amplifierInfo
- Publication number
- JPS56110312A JPS56110312A JP1317080A JP1317080A JPS56110312A JP S56110312 A JPS56110312 A JP S56110312A JP 1317080 A JP1317080 A JP 1317080A JP 1317080 A JP1317080 A JP 1317080A JP S56110312 A JPS56110312 A JP S56110312A
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- constant current
- level
- circuit
- current circuit
- 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
Landscapes
- Amplifiers (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
PURPOSE: To vary only the gain without varying the DC level, by connecting the transistor that forms a constant current circuit in parallel to the load connected to the collector of the transistor that forms a differential amplifying circuit.
CONSTITUTION: The 1st constant current circuit is formed by the transistors 1, 2 and 3, resistances 4, 6 and 7 plus the diode 8. At the same time, the 2nd constant current circuit is formed by the transistor 15, diode 16, transistor 17 and resistance 18. In case when this circuit is not included, the gain of the output signal varies with variation of the value of the load resistance 14. At the same time, the DC level also has a change. And the change of the DC level can be compensated by flowing a constant current with addition of the transistor 15.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1317080A JPS56110312A (en) | 1980-02-05 | 1980-02-05 | Diferential amplifier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1317080A JPS56110312A (en) | 1980-02-05 | 1980-02-05 | Diferential amplifier |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS56110312A true JPS56110312A (en) | 1981-09-01 |
JPS6239564B2 JPS6239564B2 (en) | 1987-08-24 |
Family
ID=11825693
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1317080A Granted JPS56110312A (en) | 1980-02-05 | 1980-02-05 | Diferential amplifier |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56110312A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57201311A (en) * | 1981-06-04 | 1982-12-09 | Toshiba Corp | Amplifier circuit |
-
1980
- 1980-02-05 JP JP1317080A patent/JPS56110312A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57201311A (en) * | 1981-06-04 | 1982-12-09 | Toshiba Corp | Amplifier circuit |
Also Published As
Publication number | Publication date |
---|---|
JPS6239564B2 (en) | 1987-08-24 |
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