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A SUB-HARMONIC MIXER AND A METHOD THEREIN FOR CONVERTING RADIO FREQUENCY SIGNALS TO INTERMEDIATE FREQUENCY SIGNALS

  • US 20170025999A1
  • Filed: 12/02/2013
  • Published: 01/26/2017
  • Est. Priority Date: 12/02/2013
  • Status: Active Grant
First Claim
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1. A sub-harmonic mixer for converting a Radio Frequency, RF, signal to an Intermediate Frequency, IF, signal, the sub-harmonic mixer comprising:

  • a Local Oscillator, LO, input to receive an LO signal;

    an RF input to receive the RF signal;

    an IF output to output the IF signal; and

    a circuit comprising two or more cascaded stages, whereineach stage having an input and an output, the output of each stage is coupled to the input of a next stage by a capacitor;

    each stage comprising a common-emitter transistor having a base, a collector and an emitter, or a common-source transistor having a gate, a drain and a source;

    the input of each stage is at the base or gate of the transistor, the output of each stage is at the collector or drain of the transistor;

    an Alternating Current, AC, choke is coupled at the collector or drain of each transistor; and

    the emitter or source of each transistor is connected to a ground; and

    whereinthe LO input is coupled to the input of a first stage of the two or more stages;

    the RF input is coupled to the output of the first stage of the two or more stages; and

    the IF output is coupled to the output of a last stage of the two or more stages.

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