Patent ID: 6735424
Filing Date: 2004-05-11
Classification: H03F,H03G

Abstract:
A method of operating an amplifier, which amplifier has an load line,to emulate the property of a class AB amplifier where increasing amplifier input current raises the d.c. bias of the amplifier and increases amplifier output current, nonetheless that the amplifier will never enter class AB operation and will always operate in class A, the method of operating an amplifier always in class A nonetheless to producing more output current from more input current comprising: monitoring the amplified output of the class A amplifier; and, in response to detecting an increase in the amplifier output, dynamically biasing the load line of the amplifier to a higher d.c. bias point, causing the amplifier to consume more power and to produce a still larger amplified output signal, nonetheless to maintaining operation of the amplifier always in class A.