| 摘要 |
The filter circuit has a time constant circuit for imparting the input signal with prescribed frequency characteristics. The time constant circuit includes a variable impedance device and a capacitor. A control signal source is used for supplying a control signal for adjusting the impedance of the varialbe impedance signal. The cortrol signal source includes a DC source for generating a DC control signal and a compensation source for generating a compensation siganl equivalent to the AC component signal of the input signal. The DC component signal has a prescirbed DC level.
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