VOLTAGE REGULATOR WITH ENHANCED PSRR PERFORMANCE
Publication Date: 2002-Apr-02
The IP.com Prior Art Database
High power supply rejection ratios (PSRR) is one of the most important performance features of voltage regulators. Prior art voltage regulators obtained high PSRR using a two stage regulator comprised of a high PSRR band-gap (BG) reference and a high PSRR Output stage such as those of common art employing cascoded stages or high gain feedback loops. As a result, prior art voltage regulators suffered from overly complicated design that are difficult and costly to manufacture. The new voltage regulator is based on a new BG cell, which has line regulation "opposite" to the line regulation of the output stage which provides a BG block which has slightly decreasing output voltage with increasing input voltage. This novelty results in improved regulation and improved PSRR.