JPS54134544A - Oscillator circuit - Google Patents

Oscillator circuit

Info

Publication number
JPS54134544A
JPS54134544A JP4296278A JP4296278A JPS54134544A JP S54134544 A JPS54134544 A JP S54134544A JP 4296278 A JP4296278 A JP 4296278A JP 4296278 A JP4296278 A JP 4296278A JP S54134544 A JPS54134544 A JP S54134544A
Authority
JP
Japan
Prior art keywords
base
collector
capacitor
constant
current
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
JP4296278A
Other languages
Japanese (ja)
Inventor
Yukio Miyazaki
Masaaki Tanioka
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP4296278A priority Critical patent/JPS54134544A/en
Publication of JPS54134544A publication Critical patent/JPS54134544A/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 obtain an oscillation output which has the duty cycle of the output waveform controlled arbitrarily and is stable in the range from a low frequency up to a high frequency only by changing the capacity value of a capacitor, by charging and discharging the capacitor by a constant current and switching and operating respective constant-current circuits and settig the constant-current value to a proper value. CONSTITUTION:Transistor Tr19 has a diode connection where the collector and the base are connected to each other, and the base of Tr19 is connected to the base of Tr20, and the first constant current and the second constant current are flowed to the collector of Tr19 and the collector of Tr20 respectively. Then, the collector of Tr20 constitutes a differential amplifier for a pair of Tr21 and Tr22, and the base of Tr22 is biased for setting the threshold level and is connected to the base of Tr21 which becomes the input of the Schmitt circuit which is provided with positive feedback in a part of the bias circuit. Then, the collector of Tr25 is connected to the base of Tr19, and Tr25 is operated synchronously with the positive feedback circuit which is connected to the bias circuit so that Tr19 and Tr20 may be turned off when Tr25 is turned on, and a capacitor is connected between the base of Tr21 and the reference potential.
JP4296278A 1978-04-11 1978-04-11 Oscillator circuit Pending JPS54134544A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4296278A JPS54134544A (en) 1978-04-11 1978-04-11 Oscillator circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4296278A JPS54134544A (en) 1978-04-11 1978-04-11 Oscillator circuit

Publications (1)

Publication Number Publication Date
JPS54134544A true JPS54134544A (en) 1979-10-19

Family

ID=12650648

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4296278A Pending JPS54134544A (en) 1978-04-11 1978-04-11 Oscillator circuit

Country Status (1)

Country Link
JP (1) JPS54134544A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2478406A1 (en) * 1980-03-11 1981-09-18 Sony Corp OSCILLATOR
JPS59147525A (en) * 1983-02-10 1984-08-23 Matsushita Electric Ind Co Ltd Oscillating circuit
JPS59189719A (en) * 1983-04-12 1984-10-27 Rohm Co Ltd Voltage control oscillator
JPS60163523A (en) * 1984-02-06 1985-08-26 Nec Corp Oscillating circuit
JPS62241395A (en) * 1986-04-11 1987-10-22 株式会社　エス・エム・シ− Maltilayer interconnection board

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5033754A (en) * 1973-06-01 1975-04-01

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5033754A (en) * 1973-06-01 1975-04-01

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2478406A1 (en) * 1980-03-11 1981-09-18 Sony Corp OSCILLATOR
JPS59147525A (en) * 1983-02-10 1984-08-23 Matsushita Electric Ind Co Ltd Oscillating circuit
JPS59189719A (en) * 1983-04-12 1984-10-27 Rohm Co Ltd Voltage control oscillator
JPH0514448B2 (en) * 1983-04-12 1993-02-25 Rohm Kk
JPS60163523A (en) * 1984-02-06 1985-08-26 Nec Corp Oscillating circuit
JPS62241395A (en) * 1986-04-11 1987-10-22 株式会社　エス・エム・シ− Maltilayer interconnection board
JPH0240227B2 (en) * 1986-04-11 1990-09-10 Smc Corp

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