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Self-attenuating RF transceiver system using antenna and modem interfaces and cable link

  • US 5,737,687 A
  • Filed: 03/01/1995
  • Issued: 04/07/1998
  • Est. Priority Date: 03/01/1995
  • Status: Expired due to Term
First Claim
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1. A wireless telephone transceiver system comprising:

  • an antenna for receiving and transmitting radio frequency signals;

    an antenna interface system coupled to said antenna for processing said radio frequency signals, said antenna interface system includinga low noise amplifier for amplifying said radio frequency signals following reception thereof by said antenna with minimum noise introduction,a power amplifier coupled to said antenna for generating an outgoing radio frequency signal for transmission by said antenna,a variable attenuator coupled to said power amplifier for attenuating said outgoing radio frequency signal prior to transmission, anda power output detection circuit for controlling said variable attenuator by generating and applying an attenuation signal to said variable attenuator when said power amplifier generates a signal having a power level greater than a predetermined level;

    a coaxial cable for propagating said radio frequency signals, said coaxial cable having a first end and a second end wherein said first end is coupled to said antenna interface system; and

    a first oscillation generation circuit coupled to said coaxial cable for introducing a first oscillating signal into said coaxial cable; and

    a second oscillation generation signal for generating a second oscillation signal in response to said attenuation signal; and

    a modem interface system coupled to said second end of said coaxial cable for processing said radio frequency signals.

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