US 7,551,689 B2
Method and apparatus for improving power amplifier efficiency in wireless communication systems having high peak to average power ratios
Wen-Yen M. Chan, Thornhill (Canada); Nasserullah Khan, Waterloo (Canada); Qingzhong Jiao, Nepean (Canada); Nagula Tharma Sangary, Waterloo (Canada); Michael Franz Habicher, Waterloo (Canada); and Xin Jin, Ottawa (Canada)
Assigned to Research In Motion Limited, Waterloo, Ontario (Canada)
Filed on Feb. 04, 2008, as Appl. No. 12/25,247.
Application 12/025247 is a continuation of application No. 10/781812, filed on Feb. 20, 2004, granted, now 7,333,563.
Prior Publication US 2008/0118001 A1, May 22, 2008
This patent is subject to a terminal disclaimer.
Int. Cl. H04K 1/02 (2006.01)
U.S. Cl. 375—297 19 Claims
OG exemplary drawing
 
1. A power management system for powering an output power amplifier block in a wireless communication device, the power management system comprising:
an average power and gain control block configured to provide a single gain control signal to control gain in the output power amplifier block, the single gain control signal being based on at least one of a power control instruction signal and a received signal strength indicator signal;
an environmental sensor unit configured to provide at least one environmental information signal related to the wireless communication device;
a power supply level adjustment generator configured to provide a power supply level adjustment signal based on a baseband outgoing data stream to be transmitted by the wireless communication device and the at least one environmental information signal;
a summer configured to sum the single gain control signal and an altered version of the power supply level adjustment signal to generate a first power control signal;
a clipper configured to receive the first power control signal and generate a second power control signal; and
a switch converter configured to receive the second power control signal and generate the single variable power supply signal;
wherein the power management system is configured to provide a single variable power supply signal to the output power amplifier block, the single variable power supply signal being based on information related to the single gain control signal, the power supply level adjustment signal and the at least one environmental information signal.