DELTA SIGMA D/A CONVERTER

摘要

PROBLEM TO BE SOLVED: To eliminate the need of a circuit for eliminating click noise by not generating the noise at the time of a mute operation during the idling of non- signal input in the delta sigma D/A converter of plural orders. SOLUTION: Primary differentiators corresponding to the respective orders and a switch means for reducing the input to the primary differentiators finally to a zero value are provided inside a loop filter so as to perform a sequence operation for successively lowering the order of the loop filter and finally reducing the output signals to zero at the time of stopping the operation of the delta sigma modulator (noise shaper) of the plural orders.