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High dynamic range receiver front end mixer requiring low local oscillator injection power

  • US 4,035,732 A
  • Filed: 03/15/1976
  • Issued: 07/12/1977
  • Est. Priority Date: 10/03/1974
  • Status: Expired due to Term
First Claim
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1. A high dynamic receiver front end for a radio frequency receiver requiring relatively low local oscillator injection power comprising:

  • a RF signal receiving means;

    a diode bridge RF signal mixing means connected at an input junction to said RF signal receiving means, said bridge having an input junction, an output junction, and a pair of intermediate junctions;

    resistance means coupled across said intermediate bridge junctions;

    local oscillator coupled across said bridge, said diodes arranged having a pair of diodes in each of said bridge branches having anodes disposed across one of said intermediate junctions and a second pair of diodes connected to said second intermediate junction havig their cathodes coupled to the second intermediate junction;

    capacitive means connected to the output junction of said bridge; and

    an IF amplification means coupled to the output junction of said bridge, said IF amplification means including a frequency selecting means for selecting a predetermined frequency received from said bridge output junction.

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