Patent ID: 7138851

Claim:
A semiconductor integrated circuit apparatus comprising: an integrated circuit main body including a plurality of MOSFETs on a semiconductor substrate; monitor means for monitoring at least one of the drain currents of said plurality of MOSFETs; and a plurality of substrate voltage regulating means for regulating the substrate voltage of said semiconductor substrate so that said drain currents are constant, wherein said monitor means comprises a constant current source and a monitoring MOSFET formed on the same substrate as said plurality of MOSFETs, said substrate voltage regulating means comprises comparison means for comparing the source potential of said monitoring MOSFET with a predetermined reference potential with the drain terminal of said monitoring MOSFET and the drain terminals of said plurality of MOSFETs connected to a predetermined potential, and said substrate voltage regulating means feeds back the output voltage output based on the comparison result by said comparison means to the substrate voltage of said monitoring MOSFET.