Clamping circuit for clamping a reference voltage at a predetermined level

摘要

A clamping circuit includes a constant current circuit including a constant current source and a current mirror circuit a trimmable resistance receiving a constant current from the constant current circuit, and a clamping MOS transistor receiving a voltage generated by the trimmable resistance at its gate to regulate a current flowing through a clamping node. It is possible to make rapid a current-voltage characteristic of the clamping circuit, and to set an arbitrary clamping potential.