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Method and apparatus of an input resistance of a passive mixer to broaden the input matching bandwidth of a common source/gate LNA

  • US 9,960,948 B2
  • Filed: 11/21/2016
  • Issued: 05/01/2018
  • Est. Priority Date: 12/06/2011
  • Status: Active Grant
First Claim
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1. A method of operating a receiver, comprising:

  • amplifying an input signal in a Low Noise Amplifier (LNA) coupled to a resonant circuit;

    coupling a switched capacitance circuit to the resonant circuit to reduce a quality factor of the resonant circuit comprising;

    coupling current from the resonant circuit through a first switch to a first capacitor integrating a first voltage; and

    coupling current from the resonant circuit through a second switch to a second capacitor integrating a second voltage;

    enabling the first switch with a clock signal;

    enabling the second switch with an inverse clock signal;

    applying a first voltage to a positive input of a differential amplifier;

    applying a second voltage to a negative input of the differential amplifier; and

    providing a sum and a difference frequency spectrum between a signal spectrum carried within the current and a frequency of the clock signal.

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