Semiconductor Technology Academic Research Center

Masafumi Uemori

Koichiro Mashiko

Haruo Kobayashi

Tomonari Ichikawa

A continuous-time band-pass &#x394;&#x3a3; AD modulator subtracts an analog signal from a DA converter from an inputted analog signal, outputs an analog signal having a subtraction result to an AD converter via a continuous-time analog band-pass filter, outputs a digital signal from the AD converter to the DA converter, and outputs the same digital signal as a digital signal subjected to a band-pass &#x394;&#x3a3; AD modulation processing. The highest input frequency 'fin' of the inputted analog signal is substantially set to three-fourths of a sampling frequency 'fs'. The DA converter is configured to convert the inputted digital signal into the analog signal, and outputs the analog signal, which is inverted or not in response to a value of the inputted digital signal and has an amplitude of substantially zero and a gradient of substantially zero at a timing k/(2fs).

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Saitama, Japan

Masafumi Uemori