| 摘要 |
The present invention relates to an integrated filter circuit for digitally controlling characteristics of inductor and capacitor to thereby produce a controlled resonant frequency. The integrated circuit includes a number of inductors being connected in series between a high frequency input node and a high frequency output node, a plurality of capacitors each connected to a connection node of said each inductors, a plurality of switches, each connected between each capacitor and a ground and a feedback control unit for controlling the switches by sensing an output signal from the high frequency output node to thereby selectively couple each capacitor to the ground through a selected switches based on the sensed output signal.
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