In Mixers

THE SPUR NUMBERS below represent the typical numbers one would see for downconversion.  The numbers shown are for a -10 dBm input. The spur suppression is decreased for lower RF power levels by (n-1).  For example if the 2RF x 2LO spur is typically 40 dBc for a -10 dBm input, then for a -20 dBm input the level is (2-1) x 10 dB lower, or 50 dBc.

Double-BalancedM1/M4/M8/M9
Spurious Suppression (Typical) – dBc

Triple-Balanced: M2’s – Sine-Wave LO-Drive
Spurious Suppression (Typical) – dBc

Triple-Balanced: M2’s – Square Wave LO-Drive
Spurious Suppression (Typical) – dBc

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Comments
  • lvoigt
    Reply

    I would like to know if there is a similar prediction to spurs caused by two different harmonics. For example, if the RF power decrease by 10 dB how is the power of the 2RF x 3LO or 4RF x 1LO etc. spurs affected? How can the formula (n-1)xD (where D is the decrease in RF power) be modified to apply to these spurs as well?

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