Temperature adaptive bandgap reference circuit

US8907650B2 · kind B2 · utility

Assignee

• University of Electronic Science and Technology of China · CN

Inventors

• Shaowei Zhen · Chengdu, CN
• Ping Luo · Sha Tin, CN
• Ruhui Yang · Chengdu, CN
• Kang Yang · Ponca City, US
• Bo Zhang · Shanghai, CN

Key dates

• Filing date: Feb 28, 2011
• Grant date: Dec 9, 2014
• Expiry date: Feb 28, 2031

Classification

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

Abstract

This invention involves a bandgap reference circuit in IC. The temperature coefficient of conventional bandgap reference is large and the higher order compensation is difficult to implement. This invention provides an adaptive compensated bandgap reference which solves the problem only using lower order (first order) temperature coefficient compensation. The invention adopts segmental compensation circuit to realize adaptive segmental compensation of bandgap reference with low temperature coefficient. The technical solution includes traditional bandgap voltage reference circuit and adaptive feedback compensation circuit which consists of sample and hold circuit, voltage comparator and control module. This invention controls the bandgap voltage reference through systematical view and it has high process compatibility. This invention can find the best temperature characteristic curve adaptively, the output voltage has low temperature coefficient, meeting the requirement of fabrication process, the implementation is simple with small area. This invention relates to integrated circuits.