Patent ID: 7675348
Filing Date: 2010-03-09
Classification: G05F,H03K

Abstract:
1. A semiconductor integrated circuit apparatus comprising: a plurality of MOSFETs on a semiconductor substrate; a substrate potential regulating circuit including a constant current source; a monitor transistor of which a drain is connected to the constant current source; and a monitor circuit for monitoring a connection node between the constant current source and the drain of the monitor transistor, wherein a reference voltage to be compared with the voltage of the connection node is input to the monitor circuit, wherein a voltage of the plurality of MOSFETs and the reference voltage of the monitor circuit are supplied from a common electric power supply and equipotential, and wherein the substrate potential regulating circuit regulates each substrate potential of the plurality of MOSFETs on the semiconductor substrate so that each of saturated currents of the plurality of MOSFETs is constant based on a state of the connection node between the constant current source and drain of the monitor transistor monitored by the monitor circuit.