JPS5787207A - Oscillating circuit - Google Patents

Oscillating circuit

Info

Publication number
JPS5787207A
JPS5787207A JP16278080A JP16278080A JPS5787207A JP S5787207 A JPS5787207 A JP S5787207A JP 16278080 A JP16278080 A JP 16278080A JP 16278080 A JP16278080 A JP 16278080A JP S5787207 A JPS5787207 A JP S5787207A
Authority
JP
Japan
Prior art keywords
turn
capacity
band
uhf band
negative resistance
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
JP16278080A
Other languages
Japanese (ja)
Inventor
Shigeo Fujimori
Toshiki Tomisaka
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP16278080A priority Critical patent/JPS5787207A/en
Publication of JPS5787207A publication Critical patent/JPS5787207A/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

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

Abstract

PURPOSE:To oscillate the VHF band and the UHF band, by using a switching element to switch a feedback capacity, which determines the frequency character istics of a fixed tuning element and a negative resistance, in a local oscillating circuit in the tuner of a TV receiver. CONSTITUTION:In case of oscillation of a frequency of the VHF band of the TV, a negative voltage V pin is applied to turn on a pin diode (PD) 47 and turn off a PD39. At this time, the capacity between the collector and the emitter of a transistor (TR) 51 becomes the sum of a capacitor (C) 53 and a C46, and the negative resistance of an amplifying circuit expands throughout the VHF band. An inductance (L) 38 is connected to a varactor diode (VD) 41 to tune in the VHF band. In case of oscillation of the UHF band, a positive voltage Vpin is applied to turn off the PD47 and turn on the PD39. The capacity between the collector and the emitter of the TR51 becomes the capacity of the C53, and the negative resistance of the amplifying circuit expands throughout the UHF band. Ls 37 and 38 are connected in parallel to the VD41 to tune in the UHF band.
JP16278080A 1980-11-19 1980-11-19 Oscillating circuit Pending JPS5787207A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16278080A JPS5787207A (en) 1980-11-19 1980-11-19 Oscillating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16278080A JPS5787207A (en) 1980-11-19 1980-11-19 Oscillating circuit

Publications (1)

Publication Number Publication Date
JPS5787207A true JPS5787207A (en) 1982-05-31

Family

ID=15761065

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16278080A Pending JPS5787207A (en) 1980-11-19 1980-11-19 Oscillating circuit

Country Status (1)

Country Link
JP (1) JPS5787207A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4593256A (en) * 1984-06-28 1986-06-03 Motorola, Inc. Oscillator with switched reactance resonator for wide bandwidth and serial bias connections for low power
JPS61202502A (en) * 1985-02-28 1986-09-08 アールシーエー　ライセンシング　コーポレーシヨン Local oscillator for tv receiver
EP0868018A1 (en) * 1997-03-27 1998-09-30 Murata Manufacturing Co., Ltd. Voltage-controlled oscillator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4593256A (en) * 1984-06-28 1986-06-03 Motorola, Inc. Oscillator with switched reactance resonator for wide bandwidth and serial bias connections for low power
JPS61202502A (en) * 1985-02-28 1986-09-08 アールシーエー　ライセンシング　コーポレーシヨン Local oscillator for tv receiver
EP0868018A1 (en) * 1997-03-27 1998-09-30 Murata Manufacturing Co., Ltd. Voltage-controlled oscillator

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