Patent ID: 7816936
Filing Date: 2010-10-19
Classification: G01R,H03K

Abstract:
1. A semiconductor integrated circuit apparatus, comprising: an internal circuit having a plurality of MIS transistors on a semiconductor substrate; a substrate voltage control block that supplies a substrate voltage to the internal circuit and controls threshold voltages for the MIS transistors of the internal circuit; a leakage current detection MIS transistor with an arbitrary potential supply voltage supplied to a source and with a gate and drain connected together and connected to a constant current source in such a manner that the substrate voltage is controlled by the substrate voltage control block; and a leakage current detection circuit having a comparator comparing a drain potential of the leakage current detection MIS transistor and a predetermined reference potential, wherein the substrate voltage control block generates a substrate voltage based on comparison results of the comparator and applies the generated substrate voltage to the substrate of the leakage current detection MIS transistor and the substrate of the MIS transistors of the internal circuit, and the substrate voltage control block comprises: a switch arranged between first and second input terminals of the comparator and the drain of the leakage current detection MIS transistor and a reference potential terminal; and an input data corrector that carries out substrate voltage adjustment two times by switching between the drain of the leakage current detection MIS transistor and the reference potential terminal and each of the input terminals of the comparator using the switch and takes an average of respective reference voltage setting values when the internal circuit is not operating, and corrects a DC offset of the comparator by generating a reference voltage based on the averaged substrate voltage setting value when the internal circuit is operating normally.