DD CONVERSION CIRCUIT AND IMAGE PICKUP DEVICE

摘要

PROBLEM TO BE SOLVED: To provide the DD conversion circuit in which DD conversion accuracy, a low circuit scale and low power consumption are satisfied at the same time. SOLUTION: This circuit is provided with a simple DD conversion circuit 1 formed by replacing multi-bit multipliers between filter coefficients and signals partly or entirely with a circuit of a simple scale and a coring circuit clipping a very small amplitude of an output signal of the simple DD conversion circuit 1. Then the circuit scale and the power consumption of a conventional conversion circuit are reduced by replacing a multiplier section requiring a large circuit scale of the conventional conversion circuit with a simple circuit using, e.g. multipliers with less bit shift and bit number and an arithmetic error between an ideal arithmetic operation result and the arithmetic operation result of the simple circuit is corrected by the post-stage coring circuit 2 to realize the DD conversion circuit satisfying high accuracy, a low circuit scale and small power consumption at the same time.