JPS5787210A - Voltage control oscillating circuit - Google Patents

Voltage control oscillating circuit

Info

Publication number
JPS5787210A
JPS5787210A JP16230180A JP16230180A JPS5787210A JP S5787210 A JPS5787210 A JP S5787210A JP 16230180 A JP16230180 A JP 16230180A JP 16230180 A JP16230180 A JP 16230180A JP S5787210 A JPS5787210 A JP S5787210A
Authority
JP
Japan
Prior art keywords
trs
trq16
signal
differential amplifiers
circuit
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
JP16230180A
Other languages
Japanese (ja)
Inventor
Tatsuyuki Amano
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP16230180A priority Critical patent/JPS5787210A/en
Publication of JPS5787210A publication Critical patent/JPS5787210A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
    • H03B5/32—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator
    • H03B5/36—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being semiconductor device
    • H03B5/366—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being semiconductor device and comprising means for varying the frequency by a variable voltage or current

Landscapes

  • Oscillators With Electromechanical Resonators (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

PURPOSE:To prevent the leakage of a signal in a variable mixing circuit and to prevent degradation of the frequency characteristics, by divinging the current of a constant current source by two transistors, and giving divided currents to two differential amplifiers to change the gain of them. CONSTITUTION:A current of a constant current source I3 is divided with transistors (TR) Q10 and Q11 by a control voltage Vc2 applied to bases of TRs Q10 and Q11 and is given to two differential amplifiers consisting of TRs Q12 and Q13 and TRs Q14 and Q15. Collectors of TRs Q13 and Q14 are connected to not only a common load R3 but also to the base of an emitter follower TRQ16. A series circuit consisting of a resistance R4, a phase leak circuit 11, a tank circuit 12, and phase shifting circuits RT and CT is connected to the emitter of the TRQ16, and two signals different in phase are inputted from circuits RT and CT to two differential amplifying circuits, and the oscillation frequency is varied by the voltage Vc2 and is outputted from the TRQ16. Since the voltage Vc2 controls TRs Q11 and Q12 to which an AC signal is not flowed, the AC signal is not leaked between differential amplifiers.
JP16230180A 1980-11-18 1980-11-18 Voltage control oscillating circuit Pending JPS5787210A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16230180A JPS5787210A (en) 1980-11-18 1980-11-18 Voltage control oscillating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16230180A JPS5787210A (en) 1980-11-18 1980-11-18 Voltage control oscillating circuit

Publications (1)

Publication Number Publication Date
JPS5787210A true JPS5787210A (en) 1982-05-31

Family

ID=15751891

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16230180A Pending JPS5787210A (en) 1980-11-18 1980-11-18 Voltage control oscillating circuit

Country Status (1)

Country Link
JP (1) JPS5787210A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61186004A (en) * 1985-02-11 1986-08-19 ゼネラル　モーターズ　コーポレーシヨン Dual mode phase shift oscillator
EP1517435A3 (en) * 2003-09-17 2006-07-19 Nihon Dempa Kogyo, Co., Ltd. Crystal oscillator circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5299745A (en) * 1976-02-18 1977-08-22 Toshiba Corp Voltage control type phase shift circuit
JPS52123155A (en) * 1976-04-09 1977-10-17 Toshiba Corp Voltage control oscillation circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5299745A (en) * 1976-02-18 1977-08-22 Toshiba Corp Voltage control type phase shift circuit
JPS52123155A (en) * 1976-04-09 1977-10-17 Toshiba Corp Voltage control oscillation circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61186004A (en) * 1985-02-11 1986-08-19 ゼネラル　モーターズ　コーポレーシヨン Dual mode phase shift oscillator
EP1517435A3 (en) * 2003-09-17 2006-07-19 Nihon Dempa Kogyo, Co., Ltd. Crystal oscillator circuit

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