Significance of LO power?

Discussion in 'Wireless & RF Design' started by KevinG, Sep 20, 2014.

  1. KevinG

    Thread Starter New Member

    Sep 20, 2014
    What is the significance of LO power for a mixer? What happens if the LO input is below the LO power required for the mixer?
  2. alfacliff

    Well-Known Member

    Dec 13, 2013
    poor noise figure and low outut from mixer. fortunatly the power is not very critical.
  3. KL7AJ

    Senior Member

    Nov 4, 2008
    Several things. The dynamic range is dependent on the LO power, among other things. Also, curiously enough, you can get more oddball intermod products by "underdriving" the mixer. There is an optimum power level for a given number of output products.

    Some really high dynamic range mixers use up to 30dBm of LO power. Check out MINICIRCUITS labs for a whole lot of great info on mixer design