DUTY/VOLTAGE CONVERSION CIRCUIT

PURPOSE:To quicken the response, to make output voltage stable and to make the circuit to an external disturbance such as an EMI noise by counting a clock number of a clock signal generated during the ON period of an input pulse and converting the measurement into a voltage. CONSTITUTION:When an inp...

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Bibliographic Details
Main Author KAWAGUCHI YUTAKA
Format Patent
LanguageEnglish
Published 09.02.1990
Subjects
BASIC ELECTRONIC CIRCUITRY
CODE CONVERSION IN GENERAL
CODING
CONTROL OR REGULATING SYSTEMS IN GENERAL
CONTROLLING
DECODING
ELECTRICITY
FUNCTIONAL ELEMENTS OF SUCH SYSTEMS
MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS
PHYSICS
PULSE TECHNIQUE
REGULATING
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Summary:PURPOSE:To quicken the response, to make output voltage stable and to make the circuit to an external disturbance such as an EMI noise by counting a clock number of a clock signal generated during the ON period of an input pulse and converting the measurement into a voltage. CONSTITUTION:When an input pulse S0 rises, a counter 2 is cleared by a signal S1, and a clock number of a clock signal S3 from a VCO(voltage controlled oscillator) 7 is counted from zero. A latch circuit 8 holds a count d0 of the counter 2 at the leading edge as an output d4. The output d4 is a digital value proportional to the duty ratio of the input pulse S0 and the output d4 is DA- converted by a DA converter 9 to obtain a voltage d4' proportional to the duty ratio of the input pulse S0. Thus, a conversion voltage almost synchronously with the period of the input pulse S0 is obtained and then the response is improved.
Bibliography:Application Number: JP19880189658