Bandgap voltage reference and method with further temperature correction

US4939442A · kind A · utility

Assignee

• TEXAS INSTRUMENTS INCORPORATED · US

Inventors

• Fernando D. Carvajal · McKinney, US
• Thomas A. Schmidt · Weilmünster, DE

Key dates

• Filing date: Mar 30, 1989
• Grant date: Jul 3, 1990
• Expiry date: Mar 30, 2009

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S323/907
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A voltage reference circuit (26) provides a stable output reference voltage over a wide temperature range. A high temperature curvature correction circuit (36) is enabled at a first predetermined temperature to adjust the output voltage accordingly. A low temperature curvature correction circuit (38) is enabled at temperatures below a second predetermined temperature to similarly affect a output voltage. The preferred embodiment, the high and low curvature correction circuits (36, 38) are operable to vary the current through one or more resistors in a bandgap circuit (26) or other reference circuit.