CIRCUIT CONSTANT VARIABLE CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a circuit constant variable circuit capable of varying circuit constant with a simple circuit structure.SOLUTION: A circuit constant variable circuit 1 includes: a capacitor C1 and a first bidirectional switch Q1 which are connected to each other in series; and a second bidirectional switch Q2 which is connected to the series circuit in parallel. An AC current is supplied across the terminals P1 and P2 of the parallel circuit. A control circuit 10 controls the first and second bidirectional switches Q1 and Q2 to control accumulated amount of electric charge on the capacitor C1 to thereby vary apparent electrostatic capacitance (circuit constant) of the capacitor C1.