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Radio frequency data communications device

  • US 6,466,634 B1
  • Filed: 09/28/1998
  • Issued: 10/15/2002
  • Est. Priority Date: 05/13/1996
  • Status: Expired due to Term
First Claim
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1. CMOS transmitter carrier circuitry, the circuitry receiving a digital clock signal, the circuitry comprising:

  • a phase locked loop including a voltage controlled oscillator configured to multiply the frequency of the digital clock signal by a predetermined multiple, a loop filter coupled to the voltage controlled oscillator, and a phase-frequency detector and charge pump coupled to the voltage controlled oscillator and to the loop filter to maintain a desired frequency, the phase locked loop having an output providing a transmitter carrier; and

    divider circuitry having an input coupled to the voltage controlled oscillator and receiving the multiplied frequency, the divider circuitry being configured to divide by the predetermined multiple, and the divider circuitry having an output coupled to the phase-frequency detector.

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