Capacitance Sensor

Abstract

A capacitance sensor includes a package, an oscillation circuit included in the package, and a first electrode and a second electrode that are disposed outside the package. The oscillation circuit includes an amplifier and a vibrator included in the package and connected between an input node and an output node of the amplifier. The first electrode is a sensing electrode connected to one of the input node and the output node of the amplifier. The second electrode has a fixed potential. An oscillation frequency of the oscillation circuit changes in accordance with a first electrostatic capacitance between the first electrode and the second electrode.

Dependencies are inferred from the claim text.