Patent · US Expired

Low drop-out regulator and an pole-zero cancellation method for the same

US6765374B1 · kind B1 · utility

54Cited by

8References

15Claims

0Family size

Assignee

System General Corp. · TW

Inventors

Ta-Yung Yang · Milpitas, US
Hsuan-I Pan · Taipei, TW
Chern-Lin Chen · Zhubei City, TW
Jenn-yu G. Lin · Taipei, TW

Key dates

Filing date	Jul 10, 2003
Grant date	Jul 20, 2004
Priority date	—
Expiry date	Jul 10, 2023

Classification

Technology area (CPC G)Physics
CPC primaryG05F1/575
WIPO fieldControl
WIPO sectorInstruments

Abstract

A method an apparatus to dynamically modify the internal compensation of a low drop-out (LDO) linear voltage regulator is presented. The process involves creating an additional equivalent series resistance (ESR) from an internal circuit. The additional ESR of the internal circuit is sufficient to ensure DC output stability. This allows the ESR of the output capacitance to be reduced to zero if desired, for improved transient response. The zero induced by the ESR of the internal circuit is frequency compensated, so that it tracks the position of the output pole as the load varies.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.