JPS54128251A - Mute circuit - Google Patents
Mute circuitInfo
- Publication number
- JPS54128251A JPS54128251A JP3553478A JP3553478A JPS54128251A JP S54128251 A JPS54128251 A JP S54128251A JP 3553478 A JP3553478 A JP 3553478A JP 3553478 A JP3553478 A JP 3553478A JP S54128251 A JPS54128251 A JP S54128251A
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- mute
- circuit
- signal
- output
- 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
- 230000010354 integration Effects 0.000 abstract 1
- 239000004065 semiconductor Substances 0.000 abstract 1
- 230000035945 sensitivity 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
- H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
Landscapes
- Control Of Amplification And Gain Control (AREA)
- Amplifiers (AREA)
Abstract
PURPOSE:To obtain a mute circuit which features the low-noise signal route and high input sensitivity and is suited to the semiconductor integration by providing the current mirror circuit to the input with the differential amplifier used for control. CONSTITUTION:When mute signal 14 is at low level, the transistor of the mute signal input circuit becomes nonconductive and output 12 shows the high voltage. Thus, differential paired transistor Q54 and Q55 constituting the mute circuit conduct. As a result, the emitter current of signal amplifying transistor Q47 flows to transistor Q54 of the mute circuit, and thus the amplified signal is delivered from Q54. In case the signal 14 is at high level, the transistor of the mute signal input circuit becomes nonconductive. And transistor Q53 and Q56 conduct contrarily to the above at the differential pair circuit, but no current flows to the output transistor side thus to obtain the output of zero.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3553478A JPS54128251A (en) | 1978-03-29 | 1978-03-29 | Mute circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3553478A JPS54128251A (en) | 1978-03-29 | 1978-03-29 | Mute circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54128251A true JPS54128251A (en) | 1979-10-04 |
Family
ID=12444392
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3553478A Pending JPS54128251A (en) | 1978-03-29 | 1978-03-29 | Mute circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54128251A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56123110A (en) * | 1980-03-05 | 1981-09-28 | Hitachi Ltd | Muting circuit |
JPS5750115A (en) * | 1980-09-10 | 1982-03-24 | Nec Corp | Gain control circuit |
-
1978
- 1978-03-29 JP JP3553478A patent/JPS54128251A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56123110A (en) * | 1980-03-05 | 1981-09-28 | Hitachi Ltd | Muting circuit |
JPS5750115A (en) * | 1980-09-10 | 1982-03-24 | Nec Corp | Gain control circuit |
JPH0137884B2 (en) * | 1980-09-10 | 1989-08-10 | Nippon Electric Co |
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