Patent ID: 6362690
Filing Date: 2002-03-26
Classification: H03F,H04B

Abstract:
A method for compensating an amplifier for changes in a load impedance, comprising:automatically determining an impedance match between an output of said amplifier and said changed load impedance; changing an input drive to said amplifier to improve said impedance match between said output of said amplifier and said changed load impedance, wherein said changing said input drive to said amplifier comprises: modulating said input drive to maintain a substantially constant output power level for said amplifier; changing a channel conductance or base current to said amplifier to improve said impedance match between said output of said amplifier and said changed load impedance, wherein said changing said channel conductance or base current comprises decreasing said channel conductance or base current to said amplifier if said load impedance increases, and increasing said channel conductance or base current to said amplifier if said load impedance decreases; and changing a drain or collector voltage to said amplifier to improve said impedance match between said output of said amplifier and said changed load impedance, wherein said changing said drain or collector voltage comprises increasing said drain or collector voltage to said amplifier if said load impedance increases, and decreasing said drain or collector voltage to said amplifier if said load impedance decreases.