Patent ID: 6750709
Filing Date: 2004-06-15
Classification: H03F

Abstract:
A linearizer for correcting gain compression and phase variation of a radio frequency input signal, said linearizer comprising:a radio frequency (RF) input; a splitter coupled to said RF input and receiving the RF input signal, said splitter separating said RF input signal into an in-phase (I) signal and a quadrature (Q) signal, wherein said Q signal is delayed ninety degrees behind said I signal; a first variable gain amplifier (VGA) having an adjustable first gain, said first VGA coupled to said splitter and amplifying said I signal to generate an amplified I signal; a second variable gain amplifier (VGA) having an adjustable second gain, said second VGA coupled to said splitter and amplifying said Q signal to generate an amplified Q signal; a RF power detector coupled to said RF input and receiving the RF input signal, said RF power detector generating an RF power signal corresponding to the power of the RF input signal; a controller coupled to said RF power detector and receiving said RF power signal, said controller including control logic operative to adjust said adjustable first and second gains to control linearization response; and a summer coupled to said first and second VGAs and summing said amplified I and Q signals to generate a linearized RF output.