JPS57123723A - Oscillator - Google Patents

Oscillator

Info

Publication number
JPS57123723A
JPS57123723A JP56202242A JP20224281A JPS57123723A JP S57123723 A JPS57123723 A JP S57123723A JP 56202242 A JP56202242 A JP 56202242A JP 20224281 A JP20224281 A JP 20224281A JP S57123723 A JPS57123723 A JP S57123723A
Authority
JP
Japan
Prior art keywords
tr1b
voltage
circuit
charging
turns
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
JP56202242A
Other languages
Japanese (ja)
Inventor
Yuichi Shiotani
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 JP56202242A priority Critical patent/JPS57123723A/en
Publication of JPS57123723A publication Critical patent/JPS57123723A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/023—Generators characterised by the type of circuit or by the means used for producing pulses by the use of differential amplifiers or comparators, with internal or external positive feedback
    • H03K3/0231—Astable circuits

Abstract

PURPOSE:To vary the oscillation period of an oscillator, which oscillates by charging and discharging a capacitor repeatedly, linearly when a control voltage is adjusted, by composing a charging circuit of a constant current circuit. CONSTITUTION:A charging circuit 3 for a capacitor (C)2 connected to a differential amplifier 1 uses a constant current circuit composed of a transistor (TR) 3b, a diode 3c, and resistances 3d-3f, and the charging voltage of the C2 is raised linearly. When the charging voltage of the C2 rises above a control voltage from a terminal 6 to the base of the TR1b of th amplifier 1, a TR1a turns on and a TR1b turns off, which is detected by the TR7 of a switching circuit 7 to turn on the TR4b of a discharging circuit 4, thereby discharging the C2. Simultaneously, the TR5c of a bias power source circuit 5 is turned on to apply a low-level bias voltage to the TR1b. When the voltage of the C2 drops below the bias voltage of the TR1b, the TR1a turns off and the TR1b turns on, performing oscillation. In this case, the oscillation period varies linearly with the control voltage from the terminal 6.
JP56202242A 1981-12-14 1981-12-14 Oscillator Pending JPS57123723A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56202242A JPS57123723A (en) 1981-12-14 1981-12-14 Oscillator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56202242A JPS57123723A (en) 1981-12-14 1981-12-14 Oscillator

Publications (1)

Publication Number Publication Date
JPS57123723A true JPS57123723A (en) 1982-08-02

Family

ID=16454303

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56202242A Pending JPS57123723A (en) 1981-12-14 1981-12-14 Oscillator

Country Status (1)

Country Link
JP (1) JPS57123723A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01264010A (en) * 1988-04-14 1989-10-20 Sharp Corp oscillation circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3914712A (en) * 1974-09-30 1975-10-21 Nasa Voltage controlled oscillator having frequency varying inversely with control voltage

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3914712A (en) * 1974-09-30 1975-10-21 Nasa Voltage controlled oscillator having frequency varying inversely with control voltage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01264010A (en) * 1988-04-14 1989-10-20 Sharp Corp oscillation circuit

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