| 摘要 |
A filter circuit for filtering an input signal including a DC component signal with a prescribed DC level and an AC component signal. The filter circuit includes a time constant circuit for imparting the input signal with prescribed frequency characteristics, the time constant circuit including a variable impedance device and a capacitor, and a control signal source for supplying a control signal for adjusting the impedance of the variable impedance device, the control signal source including a DC source for generating a DC control signal and a compensation source for generating a compensation signal equivalent to the AC component signal of the input signal.
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