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Stacked double balanced mixer circuit

  • US 5,448,772 A
  • Filed: 08/29/1994
  • Issued: 09/05/1995
  • Est. Priority Date: 08/29/1994
  • Status: Expired due to Fees
First Claim
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1. A stacked double balanced mixer, comprising:

  • a double balanced mixer comprising;

    two input transistors;

    four cross coupled output transistors;

    first inputs of said two input transistors coupled to a radio frequency (RF) differential signal having an RF carrier frequency; and

    second inputs of said four cross coupled output transistors coupled to a first local oscillator differential signal having a first LO frequency; and

    a first cross coupled differential mixer comprising;

    four cross coupled input/output transistors;

    two inputs of said four cross coupled input/output transistors coupled to a second local oscillator (LO) differential signal having a second LO frequency; and

    first cross coupled differential mixer outputs of said four cross coupled input/output transistor; and

    wherein said four cross coupled input/output transistor have first output terminal pairs DC coupled in series to second output terminal pairs of said four cross coupled output transistor; and

    wherein the stacked double balanced mixer generates, at the first cross coupled differential mixer outputs, an IF differential output signal having an IF frequency equal to a difference of the RF carrier frequency and the sum of the first and the second LO frequencies.

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