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Secondary channel for radio frequency communications

  • US 6,134,227 A
  • Filed: 04/29/1997
  • Issued: 10/17/2000
  • Est. Priority Date: 12/04/1995
  • Status: Expired due to Term
First Claim
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1. An FDD/TDD circuit arrangement in a radio-frequency communication unit, comprising:

  • a TDD controller, wherein the TDD controller comprises a master TDD burst mode controller; and

    a slave TDD burst mode controller coupled to the master controller;

    a duplex antenna arrangement for receiving radio signals of a first frequency and transmitting radio signals of a second frequency;

    an oscillator for providing a reference frequency;

    first synthesizer coupled to the oscillator;

    a mixer circuit coupled to the antenna arrangement and to the first synthesizer;

    a demodulator circuit coupled to the mixer and to the TDD controller; and

    a second synthesizer coupled to the TDD controller, antenna, and oscillator for providing a transmit signal.

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