JPS5724107A - Oscillation circuit - Google Patents

Oscillation circuit

Info

Publication number
JPS5724107A
JPS5724107A JP9919580A JP9919580A JPS5724107A JP S5724107 A JPS5724107 A JP S5724107A JP 9919580 A JP9919580 A JP 9919580A JP 9919580 A JP9919580 A JP 9919580A JP S5724107 A JPS5724107 A JP S5724107A
Authority
JP
Japan
Prior art keywords
resonance circuit
stable
capacitor
frequency bands
given
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
JP9919580A
Other languages
Japanese (ja)
Inventor
Masahiro Matsubara
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 JP9919580A priority Critical patent/JPS5724107A/en
Publication of JPS5724107A publication Critical patent/JPS5724107A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/24—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
    • H03J5/242—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection
    • H03J5/244—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection using electronic means

Landscapes

  • Superheterodyne Receivers (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)

Abstract

PURPOSE:To make stable the oscillation of a plurality of frequency bands and to make the circuit hardly influenced to environment, by providing a means which switches a part or all of capacitor's capacitances of a series resonance circuit electronically and adds it to the resonance circuit. CONSTITUTION:To oscillate a plurality of frequency bands through the use of the same varactor element Cv with a resonance circuit of a superheterodyne receiver, an electronic switching means for capacitor switching is provided. For example, when a positive potential is applied to a voltage applying terminal S1, reverse bias is given to diodes D1, D2for cut-off, the resonance circuit consists of L1, Cv, C1, C3, C6, and a C5 is used for an adjusting capacitor. When a positive potential is applied to a terminal S2, a forward bias is given to the D1, D2 for conductive state. By adding C2, C4 to the resonance circuit further, stable electronic swetching which is stable with minimized components can be made with a shorter wiring.
JP9919580A 1980-07-19 1980-07-19 Oscillation circuit Pending JPS5724107A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9919580A JPS5724107A (en) 1980-07-19 1980-07-19 Oscillation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9919580A JPS5724107A (en) 1980-07-19 1980-07-19 Oscillation circuit

Publications (1)

Publication Number Publication Date
JPS5724107A true JPS5724107A (en) 1982-02-08

Family

ID=14240859

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9919580A Pending JPS5724107A (en) 1980-07-19 1980-07-19 Oscillation circuit

Country Status (1)

Country Link
JP (1) JPS5724107A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0209640A2 (en) * 1985-04-19 1987-01-28 Ericsson GE Mobile Communications Inc. Circuit for bandswitching a voltage controlled oscillator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0209640A2 (en) * 1985-04-19 1987-01-28 Ericsson GE Mobile Communications Inc. Circuit for bandswitching a voltage controlled oscillator

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