JPS5555616A - Drive circuit for channel selector using varactor diode - Google Patents
Drive circuit for channel selector using varactor diodeInfo
- 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
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
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)
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 |
-
1978
- 1978-10-18 JP JP12897878A patent/JPS5555616A/en active Pending
Cited By (1)
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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