Patent ID: 6751266
Filing Date: 2004-06-15
Classification: H03F

Abstract:
A radio frequency (RF) transmitter system comprising:an input circuit for receiving an RF signal to be amplified and transmitted; a series circuit including first and second cascaded amplifier networks located downstream from said input circuit and wherein said first amplifier network is located upstream from said second amplifier network and wherein said first amplifier network includes a first non-linear amplifier and said second amplifier network includes a second non-linear amplifier, said first and second non-linear amplifiers exhibit non-linear response characteristics to said RF signal and introduce non-linear distortions into said RF signal and said second amplifier network includes a filter located downstream from said second amplifier and said filter introduces linear distortions into said RF signal; a first pre-correction circuit located upstream from said series circuit for pre-correcting said RF signal in a manner to compensate for said linear and non-linear distortions introduced by said second amplifier network; and, a second pre-correction circuit interposed between said first pre-correction circuit and said first amplifier network for pre-correcting said RF signal to compensate for said non-linear distortions introduced by said first amplifier network, said second pre-correction circuit including a third non-linear amplifier selected so as to exhibit a non-linear response characteristic to an applied RF signal similar to that of said first amplifier.