JPS6486609A - Coupling circuit for electronic tuner - Google Patents
Coupling circuit for electronic tunerInfo
- Publication number
- JPS6486609A JPS6486609A JP24448987A JP24448987A JPS6486609A JP S6486609 A JPS6486609 A JP S6486609A JP 24448987 A JP24448987 A JP 24448987A JP 24448987 A JP24448987 A JP 24448987A JP S6486609 A JPS6486609 A JP S6486609A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- tuning
- capacitance change
- change ratio
- large capacitance
- 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
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
PURPOSE:To ensure a broader reception channel and the S/N with an excellent tuner and to realize a small sized tuning coil by adding a varactor diode having a large capacitance change ratio to a conventional electronic tuner coupling circuit so as to combine the two diodes in parallel. CONSTITUTION:Varactor diodes 37-40 having a large capacitance change ratio are combined in parallel with coupling varactor diodes 5, 13, 16, 31 with large capacitance change ratio and the parallel connection is connected to an input terminal of transistors(TRs) 9, 20, 26 being semiconductors via coupling capacitors 8, 10, 19, 27 respectively. Then the same or different kind of tuning varactor diodes 6, 12, 17, 32 are connected also to constitute the tuning circuit. Thus, the matching between the tuning circuit and a transistor section is improved, the loss in the input circuit and the inter-stage circuit is reduced remarkably, the oscillation is made stable and the oscillation power is improved in the oscillator circuit so as to improve the gain and NF remarkably.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24448987A JPH0683028B2 (en) | 1987-09-28 | 1987-09-28 | Electronic tuner coupling circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24448987A JPH0683028B2 (en) | 1987-09-28 | 1987-09-28 | Electronic tuner coupling circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6486609A true JPS6486609A (en) | 1989-03-31 |
JPH0683028B2 JPH0683028B2 (en) | 1994-10-19 |
Family
ID=17119429
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24448987A Expired - Fee Related JPH0683028B2 (en) | 1987-09-28 | 1987-09-28 | Electronic tuner coupling circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0683028B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5376907A (en) * | 1992-03-17 | 1994-12-27 | Thomson-Csf | High-frequency tunable filter |
-
1987
- 1987-09-28 JP JP24448987A patent/JPH0683028B2/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5376907A (en) * | 1992-03-17 | 1994-12-27 | Thomson-Csf | High-frequency tunable filter |
Also Published As
Publication number | Publication date |
---|---|
JPH0683028B2 (en) | 1994-10-19 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |