| 摘要 |
PROBLEM TO BE SOLVED: To insert a delay device that can delay by one block such as a D/A converter DAC to a main negative feedback loop FB0 in aΔΣmodulation circuit provided with switched capacitor integration devices. SOLUTION: An output of a D/A converter circuit DAC is fed back negatively to an input of a 1st stage integration device IN1 and to an input side of a 2nd stage integration device IN2 and summed negatively at a main adder K1. Thus, even when a feedback signal that is substantially to be fed back negatively from the D/A converter circuit DAC to an input side of the integration device IN1 is delayed by one block, the signal is given equivalently to the post-stage and insertion of a delay device to the negative feedback loop FB0 is attained without revision of the algorithm and then this circuit is put into practice.
|
