Patent ID: 6353360
Filing Date: 2002-03-05
Classification: H03F

Abstract:
A linearized amplifier comprising:an RF input node; an RF output node; a power amplifier having an input and an output, and having a gain characteristic which decreases with the increase in input power applied to said input of said power amplifier, and having a phase characteristic which increases with input power applied to said input of said power amplifier; and an active feedforward-type predistorter having an input and an output, acting as a driver amplifier which amplifies a signal applied to said RF input node, having a gain characteristic which increases with input power applied to said input of said active feedforward-type predistorter for compensating the decrease in gain of said power amplifier, and having a phase characteristic which decreases with the increase in input power applied to said input of said active feedforward-type predistorter for compensating the increase in phase of said power amplifier; wherein said output of said power amplifier is coupled to said RF output node, said input of said active feedforward-type predistorter is coupled to said RF input node, and said output of said active feedforward-type predistorter is coupled to said input of said power amplifier.