MOS Switch circuit with consistent low on resistance

摘要

The invention provides an inverting amplifier having a CMOS inverter and a MOSFET, the latter being connected to an input-output path of the CMOS inverter to autozero the CMOS inverter to its toggle point upon being turned on. An output signal from a CMOS inverter which has a short-circuited input-output path is supplied to the back gate of the MOSFET. Even if a gate threshold voltage of the MOSFET varies, its ON resistance is kept substantially constant.