Patent ID: 7358793
Filing Date: 2008-04-15
Classification: G05F,H03K

Abstract:
1. 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 controlling the substrate voltage of said semiconductor substrate so as to keep constant said drain current, said plurality of substrate voltage regulating means comprising; first substrate voltage regulating means for regulating a substrate potential so that the individual threshold values of the plurality of MOSFETs become uniform, and second substrate voltage regulating means for regulating a substrate potential so that the individual drain currents of the plurality of MOSFETs are constant, wherein, the first substrate voltage current regulating means is used for substrate voltage regulation of a portion of said semiconductor integrated circuit main body in which portion a noise margin is lower than a predetermined value, and the second substrate voltage current regulating means is used for substrate voltage regulation of a portion of said semiconductor integrated circuit main body in which portion a noise margin is higher than the predetermined value.