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LMX2541 Harmonics

Francisco Martins
Prodigy 160 points
Other Parts Discussed in Thread: LMX2541

Hello!

How can i reduce the second harmonic? It is so high because the output is a square wave?

Regards,

Francisco

  • 0
    TI__Mastermind 28021 points

    Francisco,

    The LMX2541 has a broadband output buffer and has steady output power as a function of frequency.  Because of this, there is no filtering for the second harmonic.

    For a square wave, we get odd harmonics, but not a second harmonic.  The second harmonic is typically because the duty cycle is not a perfect 50%.  In the case of the LMX2541, the turn on times of the transistors in the output buffer are non-zero and this causes the higher second harmonic.

    The LMX2541 has adjustable settings for the output buffer and you may find that these will have some impact on the second harmonic.   Aside from this, you also have the option of adding external filtering for this.

    Regards,

    Dean