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Frequency mixer with compensated DC offset correction to reduce linearity degradation

  • US 8,787,503 B2
  • Filed: 09/18/2012
  • Issued: 07/22/2014
  • Est. Priority Date: 09/18/2012
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a frequency mixer circuit configured to generate a baseband signal based on a local oscillator signal and a radio frequency signal; and

    a compensation circuit configured to generate a DC offset-compensated signal based on the baseband signal, a DC offset compensation signal, and a second signal, the DC offset compensation signal and the second signal having currents approximately equal in magnitude and opposite in direction, a current of the DC offset-compensated signal being substantially the same as a current of the baseband signal.

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