JPS54128610A - High frequency amplifying circuit - Google Patents
High frequency amplifying circuitInfo
- Publication number
- JPS54128610A JPS54128610A JP3731178A JP3731178A JPS54128610A JP S54128610 A JPS54128610 A JP S54128610A JP 3731178 A JP3731178 A JP 3731178A JP 3731178 A JP3731178 A JP 3731178A JP S54128610 A JPS54128610 A JP S54128610A
- Authority
- JP
- Japan
- Prior art keywords
- uhf
- power supply
- reception
- amplifier
- fed
- 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
Landscapes
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
PURPOSE: To enable to select the desired TV channel arbitrarily, by cutting off the UHF band AGC power supply fed to the UHF reception amplifier at VHF band reception and keeping the output side capacitance through the interruption of UHF reception signal.
CONSTITUTION: The main operation power supply is fed to the amplifying transistor Tr7 of the UHF reception amplifier 4 from the terminal 11 and the UHF AGC power supply from the terminal 12, and from the terminal 11 to Tr7, the main opertion voltage is always fed regardless of the reception band to keep the output side capacitance of Tr7. Further, at VHF band reception, the AGC power supply of UHF band fed to the amplifier 4 is cut off to interrupt the UHF reception signal. Thus, the constant nature of the output side capacitance of the amplifier 4 makes stable the tuning characteristics of the selector tuning circuits 9 and 10. As a result, the desired TV channel can arbitrarily be selected with the output of the tuner terminal controlling the power supply circuit.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3731178A JPS54128610A (en) | 1978-03-29 | 1978-03-29 | High frequency amplifying circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3731178A JPS54128610A (en) | 1978-03-29 | 1978-03-29 | High frequency amplifying circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54128610A true JPS54128610A (en) | 1979-10-05 |
JPS6122492B2 JPS6122492B2 (en) | 1986-05-31 |
Family
ID=12494140
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3731178A Granted JPS54128610A (en) | 1978-03-29 | 1978-03-29 | High frequency amplifying circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54128610A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100423406B1 (en) * | 2001-12-14 | 2004-03-18 | 삼성전기주식회사 | Switching circuit for rf amplification in television tuner |
-
1978
- 1978-03-29 JP JP3731178A patent/JPS54128610A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100423406B1 (en) * | 2001-12-14 | 2004-03-18 | 삼성전기주식회사 | Switching circuit for rf amplification in television tuner |
Also Published As
Publication number | Publication date |
---|---|
JPS6122492B2 (en) | 1986-05-31 |
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