JPS55140327A - Pulse width modulator - Google Patents
Pulse width modulatorInfo
- Publication number
- JPS55140327A JPS55140327A JP4823979A JP4823979A JPS55140327A JP S55140327 A JPS55140327 A JP S55140327A JP 4823979 A JP4823979 A JP 4823979A JP 4823979 A JP4823979 A JP 4823979A JP S55140327 A JPS55140327 A JP S55140327A
- Authority
- JP
- Japan
- Prior art keywords
- voltages
- pulse width
- output
- wave
- always
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K7/00—Modulating pulses with a continuously-variable modulating signal
- H03K7/08—Duration or width modulation ; Duty cycle modulation
Landscapes
- Amplifiers (AREA)
Abstract
PURPOSE:To set always the average DC potential to the earth level to prevent click sound, by using a saw tooth wave or a triangular wave as the input signal and by varying the duty ratio of the output square wave by the modulation signal. CONSTITUTION:Saw tooth wave Vin 11 is input to comparator CMPA11, and voltages VD1 and VS1 are varied by modulation signal Vref 12 connected in parallel to DC power sources A12 and A13 which supply positive and negative DC voltages VD1 and VS1 of CMPA11. Therefore, the threshold voltage is always 1/2(VD1+VS1) for voltages VD1 and VS1, which determine the output crest value, and is variable for the earth level to vary the pulse width of the output square wave. Simultaneously, positive and negative crest values of output signal Vout 13 is caused to be proportional to voltages VD1 and VS1 by voltages VD1 and VS1, and control is so performed that the average value DC potential of the output square wave which has the pulse width modulated may be always the earth level. Thus, click sound at a demodulation time can be prevented from being generated.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4823979A JPS55140327A (en) | 1979-04-18 | 1979-04-18 | Pulse width modulator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4823979A JPS55140327A (en) | 1979-04-18 | 1979-04-18 | Pulse width modulator |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55140327A true JPS55140327A (en) | 1980-11-01 |
Family
ID=12797886
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4823979A Pending JPS55140327A (en) | 1979-04-18 | 1979-04-18 | Pulse width modulator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55140327A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61256825A (en) * | 1985-05-09 | 1986-11-14 | Matsushita Electric Ind Co Ltd | Pwm digital-analog converter |
JPS61264920A (en) * | 1985-05-20 | 1986-11-22 | Matsushita Electric Ind Co Ltd | Digital-analog converter |
US6342822B1 (en) | 2000-11-28 | 2002-01-29 | Fairchild Semiconductor Corporation | Method and apparatus for implementing improved pulse width modulation |
-
1979
- 1979-04-18 JP JP4823979A patent/JPS55140327A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61256825A (en) * | 1985-05-09 | 1986-11-14 | Matsushita Electric Ind Co Ltd | Pwm digital-analog converter |
JPS61264920A (en) * | 1985-05-20 | 1986-11-22 | Matsushita Electric Ind Co Ltd | Digital-analog converter |
US6342822B1 (en) | 2000-11-28 | 2002-01-29 | Fairchild Semiconductor Corporation | Method and apparatus for implementing improved pulse width modulation |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
ATE306801T1 (en) | DIGITAL PULSE WIDTH MODULATION GENERATOR | |
KR830006695A (en) | Electronic electricity meter | |
GB1560350A (en) | Pulse-width modulators | |
ES483999A1 (en) | Switched-mode voltage converter | |
JPS559147A (en) | Electric power meter | |
JPS55140327A (en) | Pulse width modulator | |
JPS56101379A (en) | Controlling method and apparatus for pulse width modulating inverter | |
GB935242A (en) | Improvements in pulse width modulators | |
JPS57111121A (en) | Pulse width modulating method and its circuit by negative feedback circuit configuration | |
JPS5590133A (en) | Pulse-width modulator | |
RU2046528C1 (en) | Method for controlling follow-up pulsed converter | |
SU651472A1 (en) | Pulse-width modulator | |
JPS56119883A (en) | Sound timepiece | |
JPS56132020A (en) | Pulse width modulating circuit | |
SU964969A1 (en) | Pulse-width amplifier | |
GB1040244A (en) | An inverter arrangement | |
SU1161961A1 (en) | Multiplying device | |
JPS6472620A (en) | Pulse width modulation type d/a converter | |
JPS54161371A (en) | Wattmeter | |
SU375778A1 (en) | ENERGY CONVERTER OF PERMANENT AND ALTERNATING CURRENT IN AMOUNT OF IL \ PULTS | |
JPS5731001A (en) | Analog input device | |
JPS52100865A (en) | Signal conversion circuit | |
SU1125551A1 (en) | Wide-band ac-to-dc voltage converter | |
SU809220A1 (en) | Operational timebase amplifier | |
JPS57177281A (en) | Power supplying method using converter |