JPS55114025A - Local oscillation circuit - Google Patents
Local oscillation circuitInfo
- Publication number
- JPS55114025A JPS55114025A JP2168379A JP2168379A JPS55114025A JP S55114025 A JPS55114025 A JP S55114025A JP 2168379 A JP2168379 A JP 2168379A JP 2168379 A JP2168379 A JP 2168379A JP S55114025 A JPS55114025 A JP S55114025A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- switching
- band
- varactor diode
- oscillation frequency
- 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
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Superheterodyne Receivers (AREA)
Abstract
PURPOSE: To widen an oscillation frequency range by varying base earth capacity while interposing a varactor diode between the base electrode of an active element and the earth.
CONSTITUTION: Transistor 16 is driven by an operating voltage from power terminal 21. A tuning voltage from tuning voltage supply terminal 22 is applied via bias resistance 23 to 1st varactor diode 15 of a main tuner circuit to vary its capacity, thereby determining an oscillation frequency. At the same time, the tuning voltage from terminal 22 is also applied to 2nd varactor diode 17 via bias resistance 24 to vary the base earth capacity of transistor 16 corresponding to the oscillation frequency, so that a broad-band circuit can be obtained with its tuning frequency band widened. Switching voltages of ±15V supplied from band-switching voltage supply terminal 23 are led to switching diode 19 as conduction and cut-off voltages to make a selection between low-frequency and high-frequency bands.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2168379A JPS55114025A (en) | 1979-02-26 | 1979-02-26 | Local oscillation circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2168379A JPS55114025A (en) | 1979-02-26 | 1979-02-26 | Local oscillation circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55114025A true JPS55114025A (en) | 1980-09-03 |
JPS6155807B2 JPS6155807B2 (en) | 1986-11-29 |
Family
ID=12061852
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2168379A Granted JPS55114025A (en) | 1979-02-26 | 1979-02-26 | Local oscillation circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55114025A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57160208U (en) * | 1981-04-03 | 1982-10-07 | ||
US4593255A (en) * | 1982-05-17 | 1986-06-03 | Sharp Kabushiki Kaisha | Varactor tuned Colpitts oscillator with compensating varactor for wide band width |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63120409U (en) * | 1987-01-28 | 1988-08-04 |
-
1979
- 1979-02-26 JP JP2168379A patent/JPS55114025A/en active Granted
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57160208U (en) * | 1981-04-03 | 1982-10-07 | ||
US4593255A (en) * | 1982-05-17 | 1986-06-03 | Sharp Kabushiki Kaisha | Varactor tuned Colpitts oscillator with compensating varactor for wide band width |
Also Published As
Publication number | Publication date |
---|---|
JPS6155807B2 (en) | 1986-11-29 |
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