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Circuitry for widening the effective range of a transmitter

  • US 5,109,538 A
  • Filed: 05/02/1990
  • Issued: 04/28/1992
  • Est. Priority Date: 05/12/1989
  • Status: Expired due to Term
First Claim
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1. Circuitry for widening the output power control range of a transmitter of a radio telephone comprising;

  • a controllable power amplifier for amplifying an output radio frequency power signal derived from the radio telephone, said power amplifier having at least one stage and being operable over a range of output power;

    a dissipative element for dissipating power;

    controllable switch means connected between the power amplifier and the output of the transmitter of the radio telephone for changing the transmitter output between first and second power control ranges of the transmitter, said switch means including a controllable switch;

    said controllable switch being operable in a first state for passing substantially the RF power emitted from the power amplifier to thereby enable formation of the first power control range, said controllable switch being operable in a second state for directing part of the RF power emitted from the power amplifier so as to be consumed in said dissipative element and for allowing part of the power to be transmitted to the output of the transmitter to thereby cause formation of the second power control range, whereby the power control range of the output of the transmitter is widened beyond that of said first power control range by the formation of the second power control range.

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