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Increased receive sensitivity radio frequency front end integrated circuits

  • US 8,649,739 B2
  • Filed: 12/29/2010
  • Issued: 02/11/2014
  • Est. Priority Date: 01/06/2010
  • Status: Active Grant
First Claim
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1. A front end circuit for coupling an antenna to a first radio frequency (RF) transceiver, the RF transceiver being defined by an operating frequency band and including a signal input and a signal output, the front end circuit comprising:

  • an antenna port connectible to the antenna;

    a transmit port connectible to the signal output of the RF transceiver;

    a receive port connectible to the signal input of the RF transceiver;

    a power amplifier including an input and an output, the input being coupled to the transmit port;

    a low noise amplifier including an input and an output, the output being coupled to the receive port; and

    a switching network interconnecting the output of the power amplifier, the input of the low noise amplifier, and the antenna port, the switching network including;

    a first resonant circuit with a first switching transistor defining a first parallel resonance with a first resonant resistance in the operating frequency band upon activation of the first switching transistor, and a substantially high transistor impedance upon deactivation of the first switching transistor, the first resonant circuit including a series resonance segment having a low impedance in the operating frequency band;

    a second resonant circuit with a second switching transistor defining a second parallel resonance with a second resonance resistance in the operating frequency band upon activation of the second switching transistor, and a substantially high transistor impedance upon deactivation of the second switching transistor; and

    a third resonant circuit with a third switching transistor defining a third parallel resonance with a third resonance resistance in the operating frequency band upon activation of the third switching transistor, and a substantially high transistor impedance upon deactivation of the third switching transistor.

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