The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 20, 2003
Filed:
Apr. 12, 2000
Stuart Baker Sanders, Apex, NC (US);
Ericsson Inc., Research Triangle Park, NC (US);
Abstract
Power amplifier mode control and an associated switching arrangement permit a wireless communications device, such as a mobile terminal, to advantageously use the same transmitter power amplifier in both digital and analog operating modes. Analog mode requires the mobile terminal to operate its receiver and transmitter in full-duplex mode, thus requiring a duplexer for separating the receive signal from the transmit signal. Digital mode requires the mobile terminal to operate its receiver and transmitter in half-duplex mode, eliminating the need for the duplexer. In a basic implementation, the mobile terminal includes a switching arrangement allowing the duplexer to be switched in and out of the power amplifier transmit path. For reasons of signal requirements and operating efficiency, the mobile terminal adjusts the operating point of the power amplifier such that it operates linearly or quasi-linearly when in the mobile terminal is in digital mode. When in analog mode, the mobile terminal switches in the duplexer and adjusts the operating point of the power amplifier such that it operates non-linearly (saturated). Because the power output increase of the power amplifier in changing from digital mode to analog mode essentially matches the power loss increase of switching in the duplexer, the overall power output of the mobile terminal remains substantially the same.