JPS57125508A - Negative feedback amplifying circuit - Google Patents
Negative feedback amplifying circuitInfo
- Publication number
- JPS57125508A JPS57125508A JP1201181A JP1201181A JPS57125508A JP S57125508 A JPS57125508 A JP S57125508A JP 1201181 A JP1201181 A JP 1201181A JP 1201181 A JP1201181 A JP 1201181A JP S57125508 A JPS57125508 A JP S57125508A
- Authority
- JP
- Japan
- Prior art keywords
- amplifying circuit
- mubeta
- resistors
- closed loop
- loop characteristics
- 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
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- H03G3/02—Manually-operated control
- H03G3/04—Manually-operated control in untuned amplifiers
Abstract
PURPOSE:To vary the gain stably over a wide range, by making the closed loop characteristics stable through the change between a plurality of variable elements with a prescribed relation. CONSTITUTION:An input signal from an input terminal 1 is amplified at an amplifying circuit consisting of transistors (TR) TR2-4, and outputted from an output terminal 5. On the other hand, a feedback circuit consists of resistors 6, 7 and a part of the output is fed back to the TR2. Denoting resistance value of resistors 6-10 as R6-R10 and when R6>>R7 is taken, the closed loop characteristics mubeta being the product between a transfer function mu of the amplifying circuit and that beta of a feedback circuit, is expressed as mubeta=R8XR9/R6XR10. When the resistors R6, R8 are changed as R8=K1XR6 (where K1 is a constant), mubeta= K1R9/R10 is obtained and K1, R9, R10 are constants, allowing to make the closed loop characteristics constant. Thus, even if the grain is changed over a wide variety, stable operation can be made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1201181A JPS57125508A (en) | 1981-01-29 | 1981-01-29 | Negative feedback amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1201181A JPS57125508A (en) | 1981-01-29 | 1981-01-29 | Negative feedback amplifying circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57125508A true JPS57125508A (en) | 1982-08-04 |
| JPS6310611B2 JPS6310611B2 (en) | 1988-03-08 |
Family
ID=11793639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1201181A Granted JPS57125508A (en) | 1981-01-29 | 1981-01-29 | Negative feedback amplifying circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57125508A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58132417U (en) * | 1982-02-27 | 1983-09-07 | 日本電気ホームエレクトロニクス株式会社 | audio amplifier |
| JPS62173809A (en) * | 1986-01-28 | 1987-07-30 | Fujitsu Ltd | Amplifier |
| JP2005204110A (en) * | 2004-01-16 | 2005-07-28 | Hitachi Kokusai Electric Inc | Electric power amplifying unit for transmitter |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3908164B2 (en) * | 2000-09-27 | 2007-04-25 | 三菱電機株式会社 | Distortion compensation output control circuit and distortion compensation output control method |
-
1981
- 1981-01-29 JP JP1201181A patent/JPS57125508A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58132417U (en) * | 1982-02-27 | 1983-09-07 | 日本電気ホームエレクトロニクス株式会社 | audio amplifier |
| JPS62173809A (en) * | 1986-01-28 | 1987-07-30 | Fujitsu Ltd | Amplifier |
| JP2005204110A (en) * | 2004-01-16 | 2005-07-28 | Hitachi Kokusai Electric Inc | Electric power amplifying unit for transmitter |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6310611B2 (en) | 1988-03-08 |
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