Title: Circuit and method for I/Q modulation with independent, high efficiency amplitude modulation
Application Number: 99813442 Application Date: 1999.10.20
Publication Number: 1326609 Publication Date: 2001.12.12
Approval Pub. Date: 2005.06.15 Granted Pub. Date: 2005.06.15
International Classifi-cation: H03C5/00;H04L27/36
Applicant(s) Name: Ericsson Inc. Address:
Inventor(s) Name: W.O. Camp Jr;J.A. Schlang;C. Gore
Attorney & Agent: luo peng
Abstract:
    An RF amplifier includes a phase modulator developing a phase modulated RF input signal to be transmitted. A power amplifier receives the RF input signal and amplifies the RF input signal to develop an RF output signal. An amplifier control is operatively associated with the phase modulator and the power amplifier. The amplifier control includes a memory for storing correction information correlating desired amplitude of the RF output signal relative to actual amplifier amplitude, and a control varies power amplifier supply voltage responsive to the correction information to linearize amplitude modulation in the power amplifier.
Time: 15