METHOD AND APPARATUS FOR DYNAMICALLY ADJUSTING A TRANSMITTER'S IMPEDANCE AND IMPLEMENTING A HYBRID POWER AMPLIFIER THEREIN WHICH SELECTIVELY CONNECTS LINEAR AND SWITCH-MODE POWER AMPLIFIERS IN SERIES

WIPO Patent Application WO2005101678

A3

A method and apparatus for dynamically adjusting the impedance between a transmitter's power amplifier (PA) and antenna to efficiently transfer power from the PA to the antenna. The impedance between the PA and the antenna is adjusted based on power level measurements and/or PA direct current (DC) consumption measurements, depending on whether the PA is a linear PA or a switch-mode PA. In another embodiment, a hybrid PA including a first stage linear PA and a second stage switch-mode PA is implemented in a transmitter. The hybrid PA selectively connects the output of the first stage linear PA to one of the input of the second stage switch-mode PA and the output of the hybrid PA, depending on the output power level of the first stage linear PA, the output power level of the hybrid PA, or a requirement indicated by a transmit power control (TPC) command.

HAQUE TANBIR (US)
DEMIR ALPASLAN (US)
KAZAKEVICH LEONID (US)
KLAHN GERALD (US)

PCT/US2005/009209

August 10, 2006

March 18, 2005

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INTERDIGITAL TECH CORP (US)
HAQUE TANBIR (US)
DEMIR ALPASLAN (US)
KAZAKEVICH LEONID (US)
KLAHN GERALD (US)

H04B7/00; H03C1/62; H03F3/04; H03F3/68; H03G3/30; H04B1/04; H04B1/46; H04B7/005; H04B17/00

US20040176026A1	2004-09-09
US20030114182A1	2003-06-19
US6993297B2	2006-01-31
US6594508B1	2003-07-15
US6552634B1	2003-04-22
US5994965A	1999-11-30
US5969681A	1999-10-19
US5903820A	1999-05-11
US4367443A	1983-01-04

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