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:
Apr. 14, 2009
Filed:
May. 05, 2006
Jussi Vepsäläinen, Helsinki, FI;
Jorma Matero, Oulu, FI;
Jussi Vepsäläinen, Helsinki, FI;
Jorma Matero, Oulu, FI;
Nokia Corporation, Espoo, FI;
Abstract
The invention relates to optimizing efficiency of a power amplifier of a transmitter. In a solution according to the invention a detected envelope () of an input signal of the power amplifier is filtered with a non-linear filter () that substantially preserves a rise time of a peak in a waveform of the envelope but lengthens a temporal duration of the peak. A filtered envelope is used as an input quantity () for a control system that controls a supply voltage of the power amplifier. For the control system it is easier to react to peaks of the filtered envelope than to the peaks of the envelope because the temporal duration of the peaks of the filtered envelope is longer than that of the peaks of the envelope.