BiCMOS voltage reference generator

US4820967A · kind A · utility

Assignee

• NATIONAL SEMICONDUCTOR CORPORATION · US

Inventors

• Robert A. Kertis · Rochester, US
• Douglas D. Smith · Puyallup, US

Key dates

• Filing date: Feb 2, 1988
• Grant date: Apr 11, 1989
• Expiry date: Feb 2, 2008

Classification

• Technology area (CPC G): Physics
• CPC primary: G05F3/30
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A BiCMOS voltage reference generator circuit generates and maintains a reference voltage within 3 mV over an 80.degree. C. temperture range and over a 1 volt change in power supply level. The circuit uses feedback from the output of the reference voltage generator to the current source supplying current to the voltage reference generator. This feedback increases the effective output impedance of the current source, making the reference voltage output substantially independent of power supply variations. The circuit operates with power supply differential as low as about 3 volts, and preferably is fabricated from bipolar transistors and MOS transistors on the same chip.