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Communication device with efficient excitation of a resonant circuit

  • US 6,922,550 B1
  • Filed: 04/11/2000
  • Issued: 07/26/2005
  • Est. Priority Date: 04/19/1999
  • Status: Expired due to Term
First Claim
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1. A communication device including a power amplifier for amplifying a modulated high frequency carrier input signal comprising a resonance circuit and an excitation circuit for a signal excitation in the resonance circuit phase and/or frequency coupled with the modulated high frequency carrier signal, characterized by said excitation occurring within excitation periods (Tex) in a periodic alternation with resonation periods (Tfre), during which the resonance circuit is in a free running resonance mode, the excitation periods being smaller than the resonation periods to define an excitation duty cycle (Tex/Tcar) relative to the period of the carrier signal (Tcar) of less than 0.5, and the resonance circuit having a resonance frequency (fres) higher than the carrier frequency (fcar) of the modulated high frequency carrier signal over a resonance frequency detuning rate (dfres), defined by the frequency deviation of said resonance frequency from said carrier frequency relative to the carrier frequency (fres/fcar−

  • 1), substantially at most corresponding to half the excitation duty cycle.

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