Patent ID: 7010276
Filing Date: 2006-03-07
Classification: H03F,H03G

Abstract:
1. A method of producing an amplitude modulated communications signal using 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 method comprising: producing a carrier signal; passing the carrier signal through an amplitude varying block, and controlling the amplitude varying block, taking into account any known non-linearity of the same, to produce a signal input related to a desired average power of the communications signal; applying the signal input t the signal input terminal; producing a power supply input signal derived at least in part from an amplitude modulation signal; and applying the power supply input signal to the power supply input terminal, the one stage producing the amplitude modulated communications signal in response to the carrier signal and the power supply input signal; whereby amplitude modulation is achieved independently of the amplitude varying block.