JPS57147322A - Voltage-controlled oscillator for rectangular wave - Google Patents
Voltage-controlled oscillator for rectangular waveInfo
- Publication number
- JPS57147322A JPS57147322A JP56032076A JP3207681A JPS57147322A JP S57147322 A JPS57147322 A JP S57147322A JP 56032076 A JP56032076 A JP 56032076A JP 3207681 A JP3207681 A JP 3207681A JP S57147322 A JPS57147322 A JP S57147322A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- resistances
- comparison
- operational amplifier
- output
- 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.)
- Granted
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 set the dury rate of an output to 50% by applying different voltages as control ones to an operational amplifier through diodes connected in the opposite directions. CONSTITUTION:A voltage is applied to an input terminal IN to develop control voltages at connection points (a) and (b) between resistances R21 and R22, and an FET. When the output point (d) of an operational amplifier AMP is at a positive potential, a diode D1 conducts to apply a voltage, divided by resistances R23 and R26, as a comparison voltage to the noninverted input terminal of the operational amplifier AMP. When the charging voltage of a capacitor C21 reaches this comparison voltage, the output point (d) is held at a negative potential and a diode D2 conducts, so that a voltage divided by resistances R24 and R26 is used as the comparison one. when the capacitor C21 is discharged to the comparison voltage, the output point (d) is held at a positive potential again. According to the input voltage, the voltages at the connection points (a) and (b) vary reversely and a 50% duty rate rectangular wave is obtained as an output.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56032076A JPS57147322A (en) | 1981-03-06 | 1981-03-06 | Voltage-controlled oscillator for rectangular wave |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56032076A JPS57147322A (en) | 1981-03-06 | 1981-03-06 | Voltage-controlled oscillator for rectangular wave |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57147322A true JPS57147322A (en) | 1982-09-11 |
JPH026454B2 JPH026454B2 (en) | 1990-02-09 |
Family
ID=12348781
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56032076A Granted JPS57147322A (en) | 1981-03-06 | 1981-03-06 | Voltage-controlled oscillator for rectangular wave |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57147322A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60241319A (en) * | 1984-05-16 | 1985-11-30 | Nec Corp | Voltage controlled oscillator |
JPS6242334U (en) * | 1985-08-30 | 1987-03-13 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4853654A (en) * | 1971-11-08 | 1973-07-27 |
-
1981
- 1981-03-06 JP JP56032076A patent/JPS57147322A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4853654A (en) * | 1971-11-08 | 1973-07-27 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60241319A (en) * | 1984-05-16 | 1985-11-30 | Nec Corp | Voltage controlled oscillator |
JPS6242334U (en) * | 1985-08-30 | 1987-03-13 |
Also Published As
Publication number | Publication date |
---|---|
JPH026454B2 (en) | 1990-02-09 |
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