ANALOG SIGNAL PROCESSING CIRCUIT FOR CCD CAMERA, AND ANALOG SIGNAL PROCESSING METHOD
A switched capacitor amplification circuit configuring an analog signal processing circuit newly includes switch circuits in a second switch circuit section, and a bias circuit in a bias circuit section. Switch circuits in a first switch circuit section are controlled by a pulse wave, are fixedly switched off during a pre-blanking period (PB period), and are switched on/off during a normal period other than the PB period such that the switched capacitor amplification circuit performs a sampling operation. The switch circuits in the second switch circuit section are controlled by a pulse wave, are switched on/off during the PB period such that the switched capacitor amplification circuit performs a sampling operation, and are fixedly switched off during the normal period other than the PB period.
1 . An analog signal processing circuit comprising a switched capacitor amplification circuit performing a sampling operation and an amplifying operation on a wave form of a received input signal,
wherein the switched capacitor amplification circuit includes:
a first switch circuit section switched on/off during a normal period such that the switched capacitor amplification circuit performs the sampling operation and fixedly switched off during a pre-blanking period between normal periods; and
a second switch circuit section arranged subsequent to the first switch circuit section from an input side, fixedly switched off during the normal period, and switched on/off during the pre-blanking period such that the switched capacitor amplification circuit performs the sampling operation.
2 . The analog signal processing circuit according to claim 1 , wherein the second switch circuit section includes a bias circuit section.
3 . The analog signal processing circuit according to claim 1 , wherein the analog signal processing circuit further comprises a black level sample/hold circuit sampling/holding a reference level of the input signal.
4 . The analog signal processing circuit according to claim 1 , wherein the analog signal processing circuit further comprises an input DC level circuit.
5 . An analog signal processing method by an analog signal processing circuit including a first switch circuit section and a second switch circuit section arranged sequentially from an input side and performing a sampling operation and an amplifying operation on a wave form of a received input signal, the method comprising:
switching on/off the first switch circuit section while fixedly switching off the second switch circuit section during a normal period such that the switched capacitor amplification circuit performs the sampling operation and the amplifying operation; and
switching on/off the second switch circuit section while fixedly switching off the first switch circuit section during a pre-blanking period between normal periods such that the switched capacitor amplification circuit performs the sampling operation and the amplifying operation.