Patent ID: 7292834
Filing Date: 2007-11-06
Classification: H03H,H04B

Abstract:
1. A switchable high frequency bandpass filter comprising: an input node and an output node; a switchable LC resonator coupled between the input node and the output node for providing a plurality of switchable filter transfer functions for a plurality of high frequency signals having different frequencies transmitted from the input node to the output node, and the switchable filter transfer functions are used for performing bandpass functions with respect to the high frequency signals, wherein the switchable LC resonator comprises: an inductive unit coupled between the input node and ground; a first capacitive unit coupled between the input node and ground such that the inductive unit and the first capacitive unit construct a first-state parallel LC resonant circuit; and a second capacitive unit coupled between the input node and ground such that the inductive unit, the first capacitive unit, and the second capacitive unit construct a second-state parallel LC resonant circuit; and a switch signal input interface circuit coupled to the switchable LC resonator, wherein a switch signal is applied to the switchable LC resonator through the switch signal input interface circuit for controlling the switchable LC resonator to provide the plurality of high frequency signals having different frequencies with a suitable one of the plurality of switchable filter transfer functions.