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Mixer for direct conversion receiver

  • US 5,303,417 A
  • Filed: 08/06/1991
  • Issued: 04/12/1994
  • Est. Priority Date: 08/08/1990
  • Status: Expired due to Term
First Claim
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1. A mixer system for a direct conversion receiver comprising an RF input path for received signals modulated on a radio frequency carrier, means to divide said received signals into I and Q paths for demodulating from said received signals I and Q signals in phase quadrature, first and second serially coupled mixer means in said I path, third and fourth serially coupled mixer means in said Q path, local oscillator means to generate local oscillator signals at a frequency of one half of the frequency of said carrier, means to apply said local oscillator signals in phase quadrature to said first and second mixer means, means to apply said local oscillator signals in phase quadrature to said third and fourth mixer means, and means to derive said I and Q signals from outputs of said second and fourth mixer means respectively.

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