Importance

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Abstract

An integrating D-A/A-D converter includes a reference value generation circuit for generating at least one reference value relating to voltage or current, a control circuit for carrying out switching between a digital or analog input and the reference value every predetermined time to connect a switched one to thereby control an integral time, and an integration circuit for respectively integrating an analog value corresponding to the digital or analog input and the reference value switched in sequence every predetermined time and delivered through the control circuit to output an integral value for providing a digital or analog output. The control circuit includes a connection element for arbitrarily carrying out switching between the analog value corresponding to the digital or analog input and the reference value to deliver a switched one to the integration circuit, a plurality of clock supply circuits for generating and outputting a plurality of clock signals having periods per unit time which are different from each other and are such that the time length relationship therebetween is indicated by an arbitrary integer ratio, and a time control circuit for controlling the time during which the connection element connects the reference value or the analog value so that an integral value of the integration circuit becomes equal to a value varying with a minimum value being as a unit in dependency upon times corresponding to respective periods of the plurality of clock signals.

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First Claim