Radio frequency envelope apparatus and method

Details Radio frequency envelope apparatus and method Radio frequency envelope apparatus and method

2007-10-02

2007-10-02

Choe, Henry (Department: 2817)

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

C330S253000

Reexamination Certificate

active

10978015

ABSTRACT:
Improved radio frequency (RF) envelope tracking apparatus for use in wireless and wired systems. In one exemplary embodiment, a transmitter upconversion stage receives input digital I and Q values, the output of the upconversion stage being fed to both an envelope tracking circuit and a power amplifier (before or after optional filtering). The envelope tracking circuit controls the operation of a power modulator, which adjusts the power amplifier. The envelope tracking circuit is specifically configured to provide improved linearity and power efficiency. The envelope tracking apparatus and methods of the present invention may be applied to heterodyne/super-heterodyne architectures as well as others.

REFERENCES:
patent: 6828856 (2004-12-01), Sanchez et al.
patent: 6975168 (2005-12-01), Tobita
patent: 7183852 (2007-02-01), Abe

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