JPS5791011A - Automatic gain control circuit - Google Patents
Automatic gain control circuitInfo
- Publication number
- JPS5791011A JPS5791011A JP16890880A JP16890880A JPS5791011A JP S5791011 A JPS5791011 A JP S5791011A JP 16890880 A JP16890880 A JP 16890880A JP 16890880 A JP16890880 A JP 16890880A JP S5791011 A JPS5791011 A JP S5791011A
- Authority
- JP
- Japan
- Prior art keywords
- detector
- output
- amplifier
- noise
- automatic gain
- 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.)
- Pending
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
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
- H03G3/3073—Circuits generating control signals when no carrier is present, or in SSB, CW or pulse receivers
Abstract
PURPOSE:To achieve an effective circuit for the reception of n-phase PSK or FM waves without carrier waves, by subtracting a detection component of noise from a control voltage of an amplifier and rejecting noise component, in the automatic control of the gain of a receiver for radio communication. CONSTITUTION:A signal level of an input signal 1 is fluctuated due to the state of transmission lines and an output 2 which is regulated within the range of a minute control error by an automatic gain control amplifier 3 is obtained. The output of the amplifier 3 is inputted to a detector 5 for signal level detection and a detector 6 for noise level detection having a detected frequency region different from that of the detector 5. That is, a region B where almost no signal component is present and only noise component is given like a n-phase PSK (phase shift keying) wave, is in existence and the detector 6 is set to the region B like this. A subtraction circuit 7 subtracts the output of detectors 5, 6 and a control voltage output is produced. Thus, the automatic gain control circuit of a virtual synchronizing system can be constituted with low cost.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16890880A JPS5791011A (en) | 1980-11-27 | 1980-11-27 | Automatic gain control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16890880A JPS5791011A (en) | 1980-11-27 | 1980-11-27 | Automatic gain control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5791011A true JPS5791011A (en) | 1982-06-07 |
Family
ID=15876787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16890880A Pending JPS5791011A (en) | 1980-11-27 | 1980-11-27 | Automatic gain control circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5791011A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56134811A (en) * | 1980-03-24 | 1981-10-21 | Sony Corp | Gain control circuit |
-
1980
- 1980-11-27 JP JP16890880A patent/JPS5791011A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56134811A (en) * | 1980-03-24 | 1981-10-21 | Sony Corp | Gain control circuit |
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