JPS6446328A - Input protection circuit device for signal receiver - Google Patents
Input protection circuit device for signal receiverInfo
- Publication number
- JPS6446328A JPS6446328A JP62203308A JP20330887A JPS6446328A JP S6446328 A JPS6446328 A JP S6446328A JP 62203308 A JP62203308 A JP 62203308A JP 20330887 A JP20330887 A JP 20330887A JP S6446328 A JPS6446328 A JP S6446328A
- Authority
- JP
- Japan
- Prior art keywords
- level
- signal
- disturbance signal
- inputted
- switch
- 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
Landscapes
- Amplifiers (AREA)
- Circuits Of Receivers In General (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
PURPOSE:To protect the input stage of a receiver, by terminating a surge signal by a termination means at the time of receiving the surge signal whose level becomes a comparatively large level in a moment. CONSTITUTION:While a signal with a prescribed level less than an excessive input level is received, switches 2a and 2b are switch ed to (a) sides by interlocking. At this time, when a disturbance signal of excessive input level is inputted, a level detector 5 and a switch driving circuit 6 detect the level of the disturbance signal, however, a prescribed time is required for the switching of the switches 2a and 2b, thereby, the switches 2a and 2b are not switched instantly to (b) sides, then, the disturbance signal is inputted to a connection point 11 via the (a) side of the switch 2a and that of the switch 2b. The disturbance signal inputted to the connection point 11 is terminated by diode circuits 21 and 22, thereby, the disturbance signal of excessive input level can be prevented from being inputted to a high frequency amplifier 4. In such a way, it is possible to prevent the high frequency amplifier 4 from being damaged due to the disturbance signal of excessive input level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62203308A JPS6446328A (en) | 1987-08-13 | 1987-08-13 | Input protection circuit device for signal receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62203308A JPS6446328A (en) | 1987-08-13 | 1987-08-13 | Input protection circuit device for signal receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6446328A true JPS6446328A (en) | 1989-02-20 |
Family
ID=16471881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62203308A Pending JPS6446328A (en) | 1987-08-13 | 1987-08-13 | Input protection circuit device for signal receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6446328A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03241906A (en) * | 1990-02-19 | 1991-10-29 | Nec Corp | Semiconductor power amplifier device |
| JP2010114481A (en) * | 2008-11-04 | 2010-05-20 | Mitsubishi Electric Corp | Base station apparatus |
| JP2011015070A (en) * | 2009-06-30 | 2011-01-20 | Toshiba Corp | Distribution apparatus of high frequency signal, distribution method, and television signal receiving apparatus |
| JP2016158097A (en) * | 2015-02-24 | 2016-09-01 | Ｎｅｃネットワーク・センサ株式会社 | Protection circuit and method of controlling same |
-
1987
- 1987-08-13 JP JP62203308A patent/JPS6446328A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03241906A (en) * | 1990-02-19 | 1991-10-29 | Nec Corp | Semiconductor power amplifier device |
| JP2010114481A (en) * | 2008-11-04 | 2010-05-20 | Mitsubishi Electric Corp | Base station apparatus |
| JP2011015070A (en) * | 2009-06-30 | 2011-01-20 | Toshiba Corp | Distribution apparatus of high frequency signal, distribution method, and television signal receiving apparatus |
| JP2016158097A (en) * | 2015-02-24 | 2016-09-01 | Ｎｅｃネットワーク・センサ株式会社 | Protection circuit and method of controlling same |
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