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Transceiver with calibrated I and Q paths and methods for deconvolved calibration

  • US 7,333,423 B2
  • Filed: 03/31/2004
  • Issued: 02/19/2008
  • Est. Priority Date: 03/31/2004
  • Status: Active Grant
First Claim
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1. A method of reducing offsets of a transceiver comprising:

  • measuring receiver amplitude and phase mismatches of receiver radio-frequency (RF) circuitry by performing a fast Fourier transform (FFT) on a receiver calibration signal;

    applying receiver amplitude and phase offsets to substantially offset the receiver mismatches;

    applying a transmitter calibration signal;

    measuring transmitter amplitude and phase mismatches of transmitter RF circuitry by performing an FFT on the transmitter calibration signal; and

    coupling a limiter between an output of the transmitter RF circuitry and an input of receiver RF circuitry, the limiter to generate a receiver-transmitter calibration signal based on an output RF signal of the transmitter RF circuitry, the receiver-transmitter calibration signal having a non-image component, an image component and a main component,wherein the transmitter amplitude and phase mismatches are measured by performing the FFT on the receiver-transmitter calibration signal based on the non-image component, the FFT to separate the image component, the non-image component and the main component.

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