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LMX2594: Need More Output Power!

BobL
Intellectual 330 points
Part Number: LMX2594

Comrades,

I need more output power from the LMX2594. I'm hoping this can be accomplished using the inductor pull-ups, instead of the 50 ohm resistor pull-ups. My frequency range is 12 to 12.5 GHz. What's the formula I would use to calculate my inductor values? Is it simply calculating the inductor value for 50 ohms reactance?  I don't see that in the datasheet anywhere. Thx in advance!

  • 0
    TI__Guru** 107850 points

    HI BobL,

    The impedance of the inductor should be high at the frequencies of interest. We recommend to pick an inductor with high SRF. 

    Our test shown an 1nH, SRF=13.5GHz inductor returns the highest output power at 12GHz. 

    If you don't need differential output, you can combine both pins together with a balun in order to get a higher single-ended output power.