Patent ID: 6426678
Filing Date: 2002-07-30
Classification: H03F

Abstract:
A high power amplifier system, comprising:a voltage-to-current converter for generating a first control current in proportion to the difference voltage between a reference voltage and a first control voltage for controlling gain; a difference voltage generator which outputs a second control voltage and a third control voltage in response to the first control current, wherein the difference between the second control voltage and third control voltage is substantially similar to the difference between the reference voltage and the first control voltage; a bias control circuit which generates a bias control current in response to the first control current and at least one control signal; a resistance component connected to the output of the bias control circuit and an input terminal; and an amplification circuit for amplifying an input signal which is received through the input terminal in response to the second and third control voltages, wherein the input signal varies about a bias voltage generated by applying the bias control current through the resistance component, wherein the bias control circuit increases the magnitude of the bias current flowing in the amplification circuit as the magnitude of the first control voltage increases within a predetermined range of control voltages, wherein the bias control circuit decreases the magnitude of the bias current flowing in the amplification circuit when the as the magnitude of the first control voltage decreases within the predetermined range of control voltages, and wherein the bias control circuit controls the bias control current to generated a fixed magnitude bias current flow in the amplification circuit when the magnitude of the first control voltage is outside the predetermined range of control voltages.