Patent ID: 6509805
Filing Date: 2003-01-21
Classification: H03B

Abstract:
An LC resonance circuit comprising;a coil connected between a first node and a second node; n (n is a positive integer equal to or larger than 2) variable-capacitance elements, each having a control electrode and connected in parallel between said first node and said second node with the capacitance value thereof caused to change in correspondence to a variable voltage applied to said control electrode; and m (m is a positive integer equal to or larger than 1) voltage reduction circuits connected in series to an input terminal at which a control voltage is input and each providing a voltage at a respective output achieved by lowering the control voltage at its respective input, and each respective output of a voltage reduction circuit being connected to a respective said control electrode of one of said n variable-capacitance elements or one of (nâˆ’1) variable-capacitance elements.