Patent ID: 9146598
Filing Date: 2015-09-29
Classification: G01R,G05F,G06F,H03K

Abstract:
1. A monitor circuit comprising: a reference voltage generating unit that generates a first reference voltage and a second reference voltage based on a common ground voltage, the second reference voltage being different in value from that of the first reference voltage; a first amplifier unit that amplifies a differential voltage between the first reference voltage and the second reference voltage; a second amplifier unit that amplifies a differential voltage between an internal power supply voltage supplied to a functional block in a semiconductor integrated circuit and the first reference voltage; and a comparator unit that compares an amplification result of the first amplifier unit and an amplification result of the second amplifier unit with each other and outputs a comparison result as a measurement result, wherein the reference voltage generating unit selectively uses, as the common ground voltage, a first internal ground voltage or a second internal ground voltage that is substantially identical to an external ground voltage.