Patent ID: 7444125
Filing Date: 2008-10-28
Classification: H03F,H03G

Abstract:
1. An apparatus for producing an amplitude modulated communications signal, comprising: an amplifier having at least one stage including a three-terminal active device having a signal input terminal, a signal output terminal, and a power supply input terminal, the three-terminal device being a non-switching stage; means for generating a carrier signal, the carrier signal being applied to the signal input terminal; means for generating a power supply input signal derived at least in part from an amplitude modulation signal, the power supply input signal being applied to the power supply input terminal; wherein the at least one stage produces the amplitude modulated communications signal in response to the carrier signal and the power supply input signal, a signal magnitude of the amplitude modulated communications signal at a given instant being dependent on a signal magnitude of the carrier signal and to a signal magnitude of the power supply input signal.