JPS57208713A - Bias controlling circuit - Google Patents
Bias controlling circuitInfo
- Publication number
- JPS57208713A JPS57208713A JP56093612A JP9361281A JPS57208713A JP S57208713 A JPS57208713 A JP S57208713A JP 56093612 A JP56093612 A JP 56093612A JP 9361281 A JP9361281 A JP 9361281A JP S57208713 A JPS57208713 A JP S57208713A
- Authority
- JP
- Japan
- Prior art keywords
- bias
- current
- output
- voltage
- error
- 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)
Abstract
PURPOSE: To improve the temperature characteristics through no adjustment of a bias current adjusting circuit, by controlling a DC bias current so that a no error can be caused in comparison with a reference value.
CONSTITUTION: A signal current flowing to an output transistor (TR)Q3 is detected by a linear detection circuit 4. This detection output becomes an inverting input to an operational amplifier A2. The operational amplifier A2 outputs a differential voltage between a reference voltage E0 and a detected output as an error voltage. A variable bias circuit 2 can control a base bias of TRs Q1 and Q2 in accordance with the conductive state of a TRQ9. Thus, an idle current of an output TR can be controlled by applying the error voltage to the base of the TRQ9. Since the idle current can be controlled accurately with a reference voltage E0, the bias current can be constant immediately after the application of power supply.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56093612A JPS57208713A (en) | 1981-06-17 | 1981-06-17 | Bias controlling circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56093612A JPS57208713A (en) | 1981-06-17 | 1981-06-17 | Bias controlling circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57208713A true JPS57208713A (en) | 1982-12-21 |
JPH0338766B2 JPH0338766B2 (en) | 1991-06-11 |
Family
ID=14087145
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56093612A Granted JPS57208713A (en) | 1981-06-17 | 1981-06-17 | Bias controlling circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57208713A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4933645A (en) * | 1986-11-21 | 1990-06-12 | Takafumi Kasai | Amplifier having a constant-current bias circuit |
US5055797A (en) * | 1989-04-03 | 1991-10-08 | Chater William T | Bias control for power amplifiers |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5248452A (en) * | 1975-10-16 | 1977-04-18 | Toshiba Corp | Ladder-type piezoelectric filter |
-
1981
- 1981-06-17 JP JP56093612A patent/JPS57208713A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5248452A (en) * | 1975-10-16 | 1977-04-18 | Toshiba Corp | Ladder-type piezoelectric filter |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4933645A (en) * | 1986-11-21 | 1990-06-12 | Takafumi Kasai | Amplifier having a constant-current bias circuit |
US5055797A (en) * | 1989-04-03 | 1991-10-08 | Chater William T | Bias control for power amplifiers |
Also Published As
Publication number | Publication date |
---|---|
JPH0338766B2 (en) | 1991-06-11 |
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