AM-RF TRANSMITTER WITH COMPENSATION FOR POWER SUPPLY VARIATIONS

摘要

AM-RF Transmitter With Compensation For Power Supply Variations An AM-RF transmitter includes a transmitter stage having a DC power supply terminal energized by an AC to DC converter including reactances having a resonant frequency approaching frequencies of an information, modulating signal. The voltage applied by the supply to the DC power supply terminal is reduced to such an extent as to induce distortion in the transmitted AM-RF carrier in response to the transmitter stage being modulated by positive amplitude variations having frequencies that approach the resonant frequency. The amplitude of the transmitter stage modulation is increased when the distortion would otherwise occur to substantially prevent the distortion. The information signal is modified in amplitude by only AC coupling a replica of the DC power supply voltage variations to one input of a four quadrant multiplier, having a second input responsive to the information signal.