Patent ID: 7414654

Claim:
An analog circuit for image sensor output signal processing, comprising: a pulse control circuit for outputting pulse signals for operating component circuits based on reference pulse signals corresponding to driving of the image sensor; and a bias circuit for supplying current to at least one portion of a component circuit; wherein the bias circuit is constituted by a frequency-dependent bias circuit that receives at least one kind of pulse signal from among the reference pulse signals that are input to the pulse control circuit and the pulse signals corresponding of the image sensor that are output from the pulse control circuit, and supplies a current amount that corresponds to the frequency of the received pulse signal to at least one portion of the component circuit, a reference sampling pulse for sampling a reference voltage period in a signal for each pixel at the horizontal drive frequency of the image sensor, a signal sampling pulse for sampling a video period in the signal for each pixel at the horizontal drive frequency, an AD converter sampling pulse for conversion to digital signals for each pixel at the horizontal drive frequency, and a clamp pulse for performing DC voltaae clamping of the signal at the horizontal drive frequency, are input to the pulse control circuit as the reference pulse signals; and the reference pulse signal that is input to the frequency-dependent bias circuit is selected from among the signal sampling pulse, the reference sampling pulse, and the AD converter sampling pulse.