JPS54120561A - Automatic gain control amplifier - Google Patents
Automatic gain control amplifierInfo
- Publication number
- JPS54120561A JPS54120561A JP2735678A JP2735678A JPS54120561A JP S54120561 A JPS54120561 A JP S54120561A JP 2735678 A JP2735678 A JP 2735678A JP 2735678 A JP2735678 A JP 2735678A JP S54120561 A JPS54120561 A JP S54120561A
- Authority
- JP
- Japan
- Prior art keywords
- agc
- constant value
- buffer unit
- control current
- controller
- 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
- 238000001514 detection method Methods 0.000 abstract 3
- 230000003321 amplification Effects 0.000 abstract 1
- 230000007423 decrease Effects 0.000 abstract 1
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 1
- 230000010355 oscillation Effects 0.000 abstract 1
- 230000001629 suppression Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
PURPOSE:To eliminate probability that unstable operation of oscillation, etc., is caused while having small compressibility, by attaining constant gain amplification with an AGC control current suppressed to a constant value when a detection becomes below an inferior threshold level. CONSTITUTION:Controller 13 is provided between detector 11 detecting an output signal and buffer unit 12 converting this detected output into an adequate current value. The output signal is applied as an AGC control current to respective control amplifiers 2-1 to 2-n by way of detector 11 and buffer unit 12. At this time, controller 13 when the detection 11 output becomes below a fixed value controls buffer unit 12 to suppress the AGC control current to a constant value and, in consequence, the operation gain of the AGC amplifier decreases down to a constant value, so that the unstable-operation state can be avoided. Next, if a signal of more than the constant value arrives in this state, controller 13 detects that the detection 11 output becomes above the constant value and resets the above-mentioned suppression on buffer unit 12. As a result, the AGC control current increases and the AGC amplifier returns the original gain state, thereby starting the AGC operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2735678A JPS54120561A (en) | 1978-03-10 | 1978-03-10 | Automatic gain control amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2735678A JPS54120561A (en) | 1978-03-10 | 1978-03-10 | Automatic gain control amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54120561A true JPS54120561A (en) | 1979-09-19 |
| JPS6221284B2 JPS6221284B2 (en) | 1987-05-12 |
Family
ID=12218752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2735678A Granted JPS54120561A (en) | 1978-03-10 | 1978-03-10 | Automatic gain control amplifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54120561A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5690011U (en) * | 1979-12-14 | 1981-07-18 | ||
| JPS5714514U (en) * | 1980-06-30 | 1982-01-25 | ||
| JPS5934729A (en) * | 1982-08-20 | 1984-02-25 | Mitsubishi Electric Corp | Power saving type communication equipment |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100880065B1 (en) * | 2001-07-06 | 2009-01-22 | 엔엑스피 비 브이 | A communication system and arrangements comprising such a communication system |
-
1978
- 1978-03-10 JP JP2735678A patent/JPS54120561A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5690011U (en) * | 1979-12-14 | 1981-07-18 | ||
| JPS5714514U (en) * | 1980-06-30 | 1982-01-25 | ||
| JPS5934729A (en) * | 1982-08-20 | 1984-02-25 | Mitsubishi Electric Corp | Power saving type communication equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6221284B2 (en) | 1987-05-12 |
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