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AM-RF transmitter with compensation for power supply variations

  • US 4,747,161 A
  • Filed: 02/25/1986
  • Issued: 05/24/1988
  • Est. Priority Date: 02/25/1986
  • Status: Expired due to Term
First Claim
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1. Apparatus for transmitting a radio frequency carrier amplitude modulated by an information signal comprising a transmitter stage having a DC power supply terminal, and an antenna output terminal on which is derived a signal in the form of an amplitude modulated radio frequency carrier, a DC power supply including an AC to DC converter connected to said DC power supply terminal, said converter including reactances having a resonant frequency, the converter being such that the DC voltage applied by said supply to said DC power supply terminal is reduced to such an extent as to induce distortion in the amplitude modulated radio frequency carrier at the antenna output terminal in response to positive amplitude variations of the information signal approaching the resonant frequency being coupled to the DC power supply terminal, and means connected between the source of the information signal and the transmitter stage for modifying the amplitude of the information signal applied to the transmitter stage so the amplitude of the transmitter stage amplitude modulation increases when the transmitter stage amplitude modulation approaches or is approximately equal to the resonant frequency and the transmitter stage is modulated by positive amplitudes, the information signal amplitude being modified so said distortion is substantially prevented.

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