To operate both an analog circuit and a digital circuit independently, and to reduce an influence on the operation of the analog circuit affected by the noise of the digital circuit even in a higher operating frequency while suppressing the circuit scale of an additional circuit for timing-controlling both the circuits from being enlarged.
An image sensor 11 for high-speed imaging (analog/digital mixed system) comprises an operation timing control circuit 11B. This circuit 11B comprises means 31, 32A each generating a first clock signal for analog operation from a main clock signal, a means 32B for multiplying the first clock signal by the delay of a predetermined amount, and a means 32C for generating a second clock signal for digital operation based on the delayed first clock signal. The means 32C generates the second clock signal, so that a temporally final clock pulse corresponding to each processing period of analog operation can stop within a processing period.
COPYRIGHT: (C)2006,JPO&NCIPI
Tomohiko Nagase
Toru Inoue
National University Corporation Shizuoka University
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Shunguchi Sekiguchi