Patent ID: 7271656

Claim:
A radio frequency (RF) linear power amplifier operating an output frequency band, having an output transistor, said power amplifier comprising: (a) a circuit means for generating a bias signal producing a quiescent current flowing through said output transistor of said RF power amplifier, said circuit means for generating a bias signal producing a quiescent current includes a differential transistor pair; and, (b) a detector circuit means for detecting RF input to said amplifier and generating an output signal tracking said detected RF input, said output signal directly coupled to said circuit means for automatically modifying said bias signal and said quiescent current through said output transistor, whereby said quiescent current at said output stage is adjusted for reduced dissipation and increased linearity at all power output levels, said detector circuit means output signal being coupled directly to one side of said differential pair; and (c) a sliding bias circuit connected to another side of said differential pair for automatically modifying said quiescent current for an output stage amplifier according to said detected RF signal input.