| 摘要 |
A filter frequency characteristic detection device includes a filter which receives a first signal and a second signal, a comparator which compares the first signal and the second signal which have passed through the filter, an offset adjusting circuit which gives an offset to each of the first signal and the second signal to be input to the comparator, a duty ratio detection circuit which detects, as a duty ratio, a change in an amplitude of the first signal and the second signal based on an output result from the comparator, and a frequency characteristic adjusting circuit which adjusts the frequency characteristic of the filter based on a detection result from the duty ratio detection circuit.
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