JPS6444110A - Amplifier - Google Patents
AmplifierInfo
- Publication number
- JPS6444110A JPS6444110A JP62199851A JP19985187A JPS6444110A JP S6444110 A JPS6444110 A JP S6444110A JP 62199851 A JP62199851 A JP 62199851A JP 19985187 A JP19985187 A JP 19985187A JP S6444110 A JPS6444110 A JP S6444110A
- Authority
- JP
- Japan
- Prior art keywords
- current
- base
- circuit
- trs
- diode
- 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
- Control Of Amplification And Gain Control (AREA)
- Amplifiers (AREA)
Abstract
PURPOSE:To approach an input bias current zero by providing a gain adjusting circuit or a base current cancel circuit to a current mirror circuit so as to correct the decrease in the cancelling current. CONSTITUTION:A transistor(TR) 45 becomes a pseudo input TR in a base current compensation circuit 25. Then a TR 44 giving an identical current to that of a TR 2 is provided so as to cause an identical current to flow to TRs 31, 45. A means detecting the base current of the TR 45 is a diode 46. Then a diode 61 and a resistor 62 constitute a level shift circuit and the base potential of the TR 45 is decided via the base-emitter voltage of resistors 51, 62 and TRs 48, 52, 61, 46. Moreover, a base drive TR 52 is provided to TRs 48, 49 of the current mirror circuit. Moreover, a TR 63 is provided in series with the TR 52 and the base current is added to the collector of the output TR 49 to make the input bias current zero.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62199851A JPH0736497B2 (en) | 1987-08-12 | 1987-08-12 | amplifier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62199851A JPH0736497B2 (en) | 1987-08-12 | 1987-08-12 | amplifier |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6444110A true JPS6444110A (en) | 1989-02-16 |
JPH0736497B2 JPH0736497B2 (en) | 1995-04-19 |
Family
ID=16414708
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62199851A Expired - Lifetime JPH0736497B2 (en) | 1987-08-12 | 1987-08-12 | amplifier |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0736497B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2673340A1 (en) * | 1991-02-21 | 1992-08-28 | Sgs Thomson Microelectronics | Amplifier with bipolar input stage with compensated input current |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4592309B2 (en) * | 2004-03-22 | 2010-12-01 | 新日本無線株式会社 | Differential amplifier circuit with input current compensation circuit |
-
1987
- 1987-08-12 JP JP62199851A patent/JPH0736497B2/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2673340A1 (en) * | 1991-02-21 | 1992-08-28 | Sgs Thomson Microelectronics | Amplifier with bipolar input stage with compensated input current |
Also Published As
Publication number | Publication date |
---|---|
JPH0736497B2 (en) | 1995-04-19 |
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