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Impedance matching circuit with tunable notch filters for power amplifier

  • US 8,803,615 B2
  • Filed: 01/23/2012
  • Issued: 08/12/2014
  • Est. Priority Date: 01/23/2012
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a power amplifier configured to amplify an input radio frequency (RF) signal and provide an amplified RF signal; and

    an impedance matching circuit coupled to the power amplifier and configured to match an output impedance of the power amplifier, the impedance matching circuit comprising at least one tunable notch filter dynamically adjusted during operation in response to a change in operating band of the input RF signal to attenuate at least one undesired signal in the amplified RF signal.

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