| 摘要 |
PROBLEM TO BE SOLVED: To provide a circuit device etc., capable of sufficiently reducing an undesired signal mixed with the input signal of an A/D converter circuit, by the effective utilization of a filter part provided on the precedent stage side of the A/D converter circuit.SOLUTION: The circuit device includes: an A/D converter circuit 100 which performs A/D conversion of the input signal; a filter part 90 provided on the precedent stage side of the A/D converter circuit 100; and a digital signal processing part 110 including a digital filter part 112 which has which performs digital filter processing on a digital signal from the A/D converter circuit 100. When a cutoff frequency fcd of the digital filter part 112 is fcd1, a cutoff frequency fca of the filter part 90 is set to be fca1, whereas when the cutoff frequency fcd is fcd2 which is lower than fcd1, the cutoff frequency fca is set to be fca2 which is lower than fca1.SELECTED DRAWING: Figure 1 |
