| 摘要 |
PURPOSE:To convert a filter part to non-adjustment and to a low cost, and to simplify a system by forming each LPF used for a signal processing part with a switched capacitor filter. CONSTITUTION:Each LPF to which an output signal of an image pickup device 26 is supplied, respectively, is replaced with switched capacitor circuits 32-34. These filter circuits 32-34 are controlled and driven by a clock pulse which a controlling circuit 35 generates. The filter circuits 32-34, the controlling circuit 35, an adding circuit 37 and a subtracting circuit 38 can be formed as a unified IC, and also can be formed as a unified IC with other processing circuits 27-31, too. By forming in this way, conversion to non-adjustment and to a low cost of a filter part, and simplification of a system can be realized. |
