Patent ID: 7218185

Claim:
An impedance circuit, comprising: a first impedance element having at least one inductor; a second impedance element having at least one capacitor; a first switch and a second switch; and a first terminal and a second terminal used to establish an outside connection, wherein: one end of said first impedance element and one end of said second impedance element are connected to said first terminal; the other end of said first impedance element is connected to said first switch; the other end of said second impedance element is connected to said second switch; one of said first switch and said second switch is connected to said second terminal and the other is connected to ground; said first switch and said second switch perform said switching with a semiconductor active element; and when one of said first and second switches is connected to said second terminal and is not connected to ground, the other of said first and second switches is connected to ground and is not connected to said second terminal.