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Radio frequency front end module with high band selectivity

  • US 9,838,069 B2
  • Filed: 05/28/2014
  • Issued: 12/05/2017
  • Est. Priority Date: 10/30/2013
  • Status: Active Grant
First Claim
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1. A radio frequency front end module for transmitting and receiving radio frequency signals, the front end module comprising:

  • a plurality of external filters, wherein the plurality of external filters include different pass bands;

    a control lead configured to supply a control signal to dynamically couple an external filter of the plurality of external filters to an integrated circuit during operation of the front end module;

    the front end module configured to dynamically adjust characteristics of the external filter to process signals from a different frequency band; and

    the integrated circuit coupled with the external filter via two external filter leads, the integrated circuit including;

    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 a modulated radio frequency signal, the transmit-receive switch outputs the amplified modulated radio frequency signal when the antenna port is coupled to the transmit port;

    a low pass filter coupled between the power amplifier and the transmit port of the transmit-receive switch, the low pass filter configured to pass low-frequency signals and attenuate signals with frequencies higher than a cutoff frequency;

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

    the two external filter leads coupling the external filter between the low noise amplifier of the integrated circuit and the receive port of the transmit-receive switch of the integrated circuit.

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