JPS5555616A - Drive circuit for channel selector using varactor diode - Google Patents

Drive circuit for channel selector using varactor diode

Info

Publication number
JPS5555616A
JPS5555616A JP12897878A JP12897878A JPS5555616A JP S5555616 A JPS5555616 A JP S5555616A JP 12897878 A JP12897878 A JP 12897878A JP 12897878 A JP12897878 A JP 12897878A JP S5555616 A JPS5555616 A JP S5555616A
Authority
JP
Japan
Prior art keywords
emitter
ground
channel selector
varactor diode
transistor
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
Application number
JP12897878A
Other languages
Japanese (ja)
Inventor
Hirohisa Hirano
Masaki Kajiwara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP12897878A priority Critical patent/JPS5555616A/en
Publication of JPS5555616A publication Critical patent/JPS5555616A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To deliver DC voltage stably, by providing the constant current element between the emitter and ground of emitter follower transistor, cancelling the temperature coefficient of each diode with this transistor, to avoid the variation between the emitter and ground.
CONSTITUTION: The emitter follower transistor TrTr1 is connected between the output terminals OUT1 and OUT2 leading to the common terminal of diodes D1, D2, and D3 and the varactor diode, and constant current element TR2 is provided between the emitter and ground. Each temperature coefficient for diodes D1...D3 can be cancelled with Tr1, the current flowing to TR2 can be made constant with TR2, the variation between the emitter and ground of transistor Tr1 is avoided by the variable resistors VR1, VR2 and VR3, to ensure to deliver stable DC voltage to the channel selector.
COPYRIGHT: (C)1980,JPO&Japio
JP12897878A 1978-10-18 1978-10-18 Drive circuit for channel selector using varactor diode Pending JPS5555616A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12897878A JPS5555616A (en) 1978-10-18 1978-10-18 Drive circuit for channel selector using varactor diode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12897878A JPS5555616A (en) 1978-10-18 1978-10-18 Drive circuit for channel selector using varactor diode

Publications (1)

Publication Number Publication Date
JPS5555616A true JPS5555616A (en) 1980-04-23

Family

ID=14998092

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12897878A Pending JPS5555616A (en) 1978-10-18 1978-10-18 Drive circuit for channel selector using varactor diode

Country Status (1)

Country Link
JP (1) JPS5555616A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4792989A (en) * 1986-02-25 1988-12-20 Plessey Overseas Limited Tuner circuits and voltage generators therefor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4792989A (en) * 1986-02-25 1988-12-20 Plessey Overseas Limited Tuner circuits and voltage generators therefor

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