APPPARATUS FOR ADJUSTING THRESHOLD VOLTAGE OF MOS TRANSISTOR AND ITS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a means for adjusting the effective threshold voltage of a MOS transistor to a desired value. SOLUTION: A reference voltage generating circuit is used for generating a primary voltage signal. A threshold voltage monitoring circuit including a MOS transistor measures the effective threshold voltage of the MOS transistor and is used for generating a secondary voltage signal. A feedback circuit compares the primary voltage signal with the secondary voltage signal and adjusts the effective threshold voltage of the MOS transistor so that the primary voltage signal may become substantially equal to the secondary voltage signal. The effective threshold voltage of the MOS transistor is adjusted by adjusting source-body potential. COPYRIGHT: (C)2007,JPO&INPIT