Broadcom Corporation

Hans Eberhart

Ramon Alejandro Gomez

Kevin Lee Miller

Massimo Brandolini

Jiangfeng Wu

Tianwei Li

Highly power efficient transmitter output stage designs are provided. In an embodiment, the probability density function (PDF) of an input signal is divided into a plurality of regions, and samples of the input signal are processed depending on the region of the PDF within which they fall. The PDF can be divided between an inner region corresponding to samples of the input signal that are within a predetermined amplitude range, and outer regions corresponding to samples of the input signal that are outside of the predetermined amplitude range. Samples of the input signal that fall in the inner region are processed by a class A biased amplifier and samples of the input signal that fall in the outer regions are processed by a class B biased amplifier. Output stage designs according to embodiments can be implemented as power amplifiers or power digital-to-analog converters (DACs).

High efficiency output stage amplification for radio frequency (RF) transmitters

The present invention provides for a device to reduce the voltage swing for control signals. An input signal with a maximum potential of DVDD and minimum potential of AVSS is level shifted to a maximum potential of AVDD and a minimum potential of AVDD-DVDD. A series of control signals are generated from the level shifted input signal by standard logic cells. The shifting of the input signal reduces the voltage swing for the control signals. These control signals are then used to drive a device operating at a potential of AVDD.

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Lomita, CA, United States of America

Hans Eberhart