Patent · US Active

Class AB amplifier

US9660585B2 · kind B2 · utility

3Cited by

12References

12Claims

0Family size

Assignee

QUALCOMM Incorporated · US

Inventors

Ayush Mittal · Bengaluru, IN
Gireesh Rajendran · Bengaluru, IN
Rahul Karmaker · Bengaluru, IN

Key dates

Filing date	Jun 17, 2015
Grant date	May 23, 2017
Priority date	—
Expiry date	Jun 17, 2035

Classification

Technology area (CPC H)Electricity
CPC primaryH03F2203/45134
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

A class AB amplifier may include an input stage, a first folded cascode stage, a second folded cascode stage, and a class AB output stage. In some embodiments, the class AB output stage may provide differential output signals. The common-mode voltage of the differential output signals may be controlled via a correction signal coupled to a selected folded cascode stage. The correction signal may control the common-mode voltage of the differential output signals by altering bias currents within the selected folded cascode stage. The other cascode stage may include bias currents controlled by relatively fixed bias voltages.

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