公开(公告)号：DE69621020D1

公开(公告)日：2002-06-06

申请号：DE69621020

申请日：1996-11-04

Applicant: ST MICROELECTRONICS SRL

Inventor： MACCARRONE MARCO ,  ZAMMATTIO MATTEO ,  COMMODARO STEFANO

IPC: G05F3/26 ,  G05F3/30

Abstract: A band-gap reference voltage generator comprises an operational amplifier (2) comprising a first input and a second input, the first input being coupled to a first feedback network (4) and the second input being coupled to a second feedback network (6) both coupled to an output (7) of the operational amplifier providing a reference voltage, the first feedback network containing an emitter-base junction of first bipolar junction transistor means (Q1) and the second feedback network containing an emitter-base junction of second bipolar junction transistor means (Q2), and current supplying means (11) for supplying a bias current to the operational amplifier, the current supplying means being deactivatable in a substantially zero power consumption operating condition for turning the reference voltage generator off, characterized by comprising start-up circuit means (13) activated upon start-up of the reference voltage generator for a fixed, prescribed time interval for forcing a start-up current to flow through the first bipolar junction transistor means (Q1).