| 摘要 |
PROBLEM TO BE SOLVED: To provide a filter capable of reducing current consumption and a demodulator using the filter. SOLUTION: This filter is provided with a correction circuit 2 for generating a correction signal CORR by a reference signal ST and controlling the cutoff frequency of a filter circuit 1. The filter is provided with a retention circuit 3 for retaining the correction signal CORR outputted from the correction circuit 2. The cutoff frequency of the filter circuit 1 is controlled by the correction signal CORR which is retained by the retention circuit 3.
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