Patent ID: 6498738
Filing Date: 2002-12-24
Classification: H03K

Abstract:
A reverse level shift circuit that converts an input voltage signal using a first potential as a reference potential to an output voltage signal using a second potential lower than said first potential, as a reference potential, and then outputs said output voltage signal,said reverse level shift circuit comprising: a voltage-current conversion part operating based on said first potential, which converts said input voltage signal to a current signal corresponding to a value of said input voltage signal, then outputs said current signal; a Nch-MOS transistor having a source to which said second potential is applied via a load, a drain responsive to the current signal from said voltage-current conversion part, and a gate to which a fixed potential is applied; and a current-voltage conversion part operating based on said second potential, which converts current from said source of said Nch-MOS transistor to a voltage signal corresponding to a value of said current, and then outputs said voltage signal as said output voltage signal.