Patent ID: 6600516
Filing Date: 2003-07-29
Classification: H03F,H04H

Abstract:
A digital radio frequency transmitter system comprising:an input circuit for receiving digital signals to be amplified and transmitted; a digital-to-analog converter for converting the digital signals into analog signals; a series circuit including a radio frequency filter and a radio frequency amplifier located downstream from said converter wherein said filter and said amplifier respectively introduce linear and non-linear distortions into the analog signals for transmission by the transmitter; a digital pre-correction circuit located upstream from said digital-to-analog converter for pre-correcting said digital signals in a manner to compensate for at least some of said distortions; and, an analog pre-correction circuit interposed between said digital-to-analog converter and said series circuit for pre-correcting said analog signals to additionally compensate for at least some of said distortions prior to application to said series circuit.