OPAMP-less bandgap voltage reference with high PSRR and low voltage in CMOS process

US7737769B2 · kind B2 · utility

Assignee

• Shenzhen STS Microelectronics Co. Ltd · CN

Inventors

• Yun Fei Deng · Shanghai, CN
• Shun Bai Tang · Nanhu, CN

Key dates

• Filing date: Mar 14, 2008
• Grant date: Jun 15, 2010
• Expiry date: Mar 14, 2028

Classification

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

Abstract

A circuit includes an OPAMP-less bandgap voltage generating core circuit connected between a regulated voltage and a ground reference to generate an output bandgap voltage. A preregulator circuit generates the regulated voltage from an unregulated supply voltage. The preregulator circuit includes a negative feedback loop operable to stabilize the regulated voltage and a current source operable to source current for the regulated voltage, the current source mirroring a PTAT current of the OPAMP-less bandgap voltage generating core circuit. The core circuit further includes a negative feedback loop and a positive feedback loop, the negative and positive feedback loops functioning to equalize two internal voltages within the core.