LOW PASS FILTER AND SEMICONDUCTOR DEVICE

A low pass filter and a semiconductor device including the low pass filter are capable of quickly reaching a steady state upon power-on. The low pass filter includes a first first-conductivity-type MOS transistor, an electrostatic capacitor, a buffer circuit, a bias circuit, an input terminal, and an output terminal. The input terminal is connected to a source terminal of the first first-conductivity-type MOS transistor. A drain terminal of the first first-conductivity-type MOS transistor is connected to a first terminal of the electrostatic capacitor, the output terminal, and an input terminal of the buffer circuit. An output terminal of the buffer circuit is connected to an input terminal of the bias circuit. An output terminal of the bias circuit is connected to a gate terminal of the first first-conductivity-type MOS transistor.