JPS5521609A - Pulse frequency modulation circuit - Google Patents
Pulse frequency modulation circuitInfo
- 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
Links
Landscapes
- 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
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)
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)
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 |
-
1978
- 1978-08-02 JP JP9366578A patent/JPS5521609A/en active Pending
Patent Citations (3)
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)
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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