Patent ID: 6782244
Filing Date: 2004-08-24
Classification: H03F

Abstract:
A radio frequency amplifier comprising:a signal input for receiving a source signal; a plurality of selectively enabled amplifier segments connected to said signal input, each providing an amplified source signal via a segment output when enabled; a bias circuit selectively enabling a desired combination of said amplifier segments via one or more bias signals responsive to a bias control signal; and a final output connected to said segment outputs providing an amplifier output signal based on combining said amplified source signals and having an output power determined by said desired combination of enabled amplifier segments; wherein said plurality of amplifier segments each comprise a plurality of amplification stages, each of said amplification stages comprising a stage input, a stage output, and a transistor amplifier arrangement disposed between said stage input and stage output, and each said stage input includes an impedance matching circuit and each said stage output includes a phase compensation circuit.