Patent ID: 6256482
Filing Date: 2001-07-03
Classification: H03F

Abstract:
A transmitter, comprising:a) a first amplifier, said first amplifier having a signal input, a first supply-voltage input, and a first amplifier output;b) a driver having a second supply-voltage input and a driver output; andc) a final amplifier having a final amplifier input coupled to said driver output, said final amplifier having a drive level, an RF output, and a third supply-voltage input, and said first amplifier being coupled to said third supply-voltage input of said final amplifier for modulating said final amplifier, said transmitter being characterized in that:said first amplifier is also coupled to said second supply-voltage input of said driver for modulating said driver, whereby said first amplifier performs as a first modulator and said transmitter being further characterized in that said drive level of said final amplifier is controlled by a DC offset voltage applied to said driver for setting said minimum drive level for ensuring linear modulation of said final amplifier.