JPS5521609A - Pulse frequency modulation circuit - Google Patents

Pulse frequency modulation circuit

Info

Publication number
JPS5521609A
JPS5521609A JP9366578A JP9366578A JPS5521609A JP S5521609 A JPS5521609 A JP S5521609A JP 9366578 A JP9366578 A JP 9366578A JP 9366578 A JP9366578 A JP 9366578A JP S5521609 A JPS5521609 A JP S5521609A
Authority
JP
Japan
Prior art keywords
capacitor
operational amplifier
voltage
input voltage
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
JP9366578A
Other languages
Japanese (ja)
Inventor
Koichi Asatani
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP9366578A priority Critical patent/JPS5521609A/en
Publication of JPS5521609A publication Critical patent/JPS5521609A/en
Pending legal-status Critical Current

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  • Amplifiers (AREA)

Abstract

PURPOSE: To improve the linearity of modulation, by charging the time-voltage conversion capacitor with the constant current circuit consisting of the operational amplifier and FET.
CONSTITUTION: In the constant current circuit in which the output of the operational amplifier 11 is given to the gate of FET 10, taking the drain current as i0, feedback current as jb, resistance value of the load resistor 12 as R, and non-inverting voltage of the operational amplifier as Vi, i0=(Vi-Vss)/R+jb. since ib=several n to μA, then i0≫jb, and i0=(Vi-Vss)/R approximately. Since the charging of the capacitor 3 is made from the constant current circuit excellent in the linearity between the input voltage versus output current, the terminal voltage at the capacitor 3 increases in proportional to time. When the input voltage of the comparator 5 as the result is in agreement with Vr1, the monostable multivibrator 6 is triggered and the capacitor 3 is discharged, and the pulse is outputted from the terminal 7 in the period in proportional to the input voltage Vi.
COPYRIGHT: (C)1980,JPO&Japio
JP9366578A 1978-08-02 1978-08-02 Pulse frequency modulation circuit Pending JPS5521609A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9366578A JPS5521609A (en) 1978-08-02 1978-08-02 Pulse frequency modulation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9366578A JPS5521609A (en) 1978-08-02 1978-08-02 Pulse frequency modulation circuit

Publications (1)

Publication Number Publication Date
JPS5521609A true JPS5521609A (en) 1980-02-15

Family

ID=14088685

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9366578A Pending JPS5521609A (en) 1978-08-02 1978-08-02 Pulse frequency modulation circuit

Country Status (1)

Country Link
JP (1) JPS5521609A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106330146A (en) * 2016-08-10 2017-01-11 上海交通大学 Carrier generation circuit for pulse frequency modulation
CN109581238A (en) * 2018-12-05 2019-04-05 珠海东帆科技有限公司 A kind of internal resistance of cell measuring circuit and measurement method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS492505A (en) * 1972-04-18 1974-01-10
JPS4944783A (en) * 1972-09-01 1974-04-27
JPS5383567A (en) * 1976-12-29 1978-07-24 Takeda Riken Ind Co Ltd Integral ad converter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS492505A (en) * 1972-04-18 1974-01-10
JPS4944783A (en) * 1972-09-01 1974-04-27
JPS5383567A (en) * 1976-12-29 1978-07-24 Takeda Riken Ind Co Ltd Integral ad converter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106330146A (en) * 2016-08-10 2017-01-11 上海交通大学 Carrier generation circuit for pulse frequency modulation
CN106330146B (en) * 2016-08-10 2019-08-09 上海交通大学 Carrier generating circuit for pulse frequency modulated
CN109581238A (en) * 2018-12-05 2019-04-05 珠海东帆科技有限公司 A kind of internal resistance of cell measuring circuit and measurement method

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