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Radio frequency front end module with high band selectivity

  • US 10,469,123 B2
  • Filed: 10/30/2017
  • Issued: 11/05/2019
  • Est. Priority Date: 10/30/2013
  • Status: Active Grant
First Claim
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1. A wireless networking device for transmitting and receiving radio frequency signals, the device comprising:

  • an antenna configured to transmit an output radio frequency signal and to receive an input radio frequency signal;

    a front end module, the front end module including an integrated circuit to transmit the output radio frequency signal to the antenna and to receive the input radio frequency signal from the antenna under a time-division multiplexing framework, the integrated circuit amplifying the output radio frequency signal and the input radio frequency signal, said front end module configured to adjust characteristics of a band pass filter to process signals from a different frequency band;

    wherein the integrated circuit includes;

    a transmit-receive switch having a transmit port, a receive port and an antenna port, the transmit-receive switch during operation alternates between coupling the antenna port to the transmit port and coupling the antenna port to the receive port;

    a power amplifier configured to amplify the output radio frequency signal, when the antenna port is coupled to the transmit port;

    a low noise amplifier configured to amplify the input radio frequency signal when the antenna port is coupled to the receive port; and

    two external filter leads coupling the band pass filter outside the integrated circuit between the low noise amplifier and the receive port of the transmit-receive switch; and

    a radio signal component configured to modulate a carrier wave to construct the output radio frequency signal, and to demodulate the input radio frequency signal to extract an information-bearing signal.

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