Variable capacitance circuit and impedance matching circuit

摘要

A first variable capacitance section included in a variable capacitance circuit includes a plurality of first variable capacitance elements connected to a signal line and each having a first capacitance value or a second capacitance value greater than the first capacitance value according to driving voltage, and includes a first fixed capacitance element connected in series with the plurality of first variable capacitance elements. A second variable capacitance section included in the variable capacitance circuit includes a second variable capacitance element connected to the signal line and having the first capacitance value or the second capacitance value according to the driving voltage, and includes a second fixed capacitance element connected in series with the second variable capacitance element.

主权项

1. A variable capacitance circuit comprising:
a first variable capacitance section including:
a plurality of first variable capacitance elements connected to a signal line and each having a first capacitance value that can be changed between a first value and a second value greater than the first value according to a driving voltage; anda first fixed capacitance element connected in series with the plurality of first variable capacitance elements; and a second variable capacitance section including:
one or more second variable capacitance elements connected to the signal line and having a second capacitance value that can be changed between the first value and the second value according to the driving voltage, a number of the one or more second variable capacitance elements being fewer than a number of the plurality of first variable capacitance elements; anda second fixed capacitance element connected in series with the one or more second variable capacitance elements.