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LMX2592EVM Gerber file and Waveform of output

Brandon Becker
Prodigy 30 points
Other Parts Discussed in Thread: LMX2592

LMX2592

TI engineer,

What kind of waveform can I expect at the output of the LMX2592 synthesizer? From the EVM board I measured more of a square wave at 930MHz on output A. Output B looks more like a sinusoidal but is still not perfect (I figure the filter toke out some harmonics). I also used the onboard oscillator. I would like a sinusoidal wave at 930Mhz and possibly at 2.4 GHz (ISM band). The power output isn't that important and the application doesn't require any fast switching speeds. Is this possible or will I have to filter out what I don't want?

Secondly, I would like to use the EVM part layout for my board but have to make a few modifications. It would be unpleasant to come up with my own Altium Designer/Eagle design/layout. Would it be possible to send the needed files (Gerber, .docPCB, etc.)?

Thank you,

Brandon Becker

  • 0
    TI__Expert 4085 points
    Hi Brandon,

    Thank you for your interest in our products. We received your question and will be answering it as soon as possible. We appreciate your patience.

    Best Regards,
    Julian
  • 0
    TI__Expert 8505 points

    Hi Brandon,

    when you have output frequencies directly from the VCO (3.55 to 7.1GHz) you have a sine waveform. When you use the channel divider (frequencies below 3.55GHz) you get the square type waveform. The inductor for the pull-up on output B does have a filtering effect as it has high impedance at the frequency it was designed for peak output power, but has very low impedance outside of that, which you'll see even more effect of lower MHz range. you can use this effect with smaller value inductor pull-ups, or if you don't mind the output power, to use external filter to additionally achieve the sine waveform

    see the Gerbers attached here. hope this helps. thanks!

    5504.Gerber.zip

  • 0 in reply to Brian Wang
    Prodigy 30 points

    Mr. Wang,

    Okay thank you! That's kind of what I figured. We will just add a filter on the final output of our board. The files you sent we useful, however would it be possible to send me the PCB files that I can pull up in Altium Designer to edit/or copy into my board design? The CAM files to my understanding are just "construction blueprints" that cannot be reversed into working PCB files. I would like to not have to reverse engineer the board but just copy your design (PCB file) into mine. Would this be possible?

    Thanks,

    Brandon

  • 0 in reply to Brandon Becker
    TI__Expert 8505 points

    SV601260A Build Files 11-23-2015.zipBrandon,

    Here are the Altium Design project files (attached) for direct import.

    Regards,

    Brian Wang

  • 0 in reply to Brian Wang
    Prodigy 30 points

    Brian,

    Thank you those files saved us lots of time.

    For RFoutA i measured the phase to be roughly 110 degrees and for RFoutB I measured the phase to be 120 degrees. I would like them to be 90 degrees apart. Can this be done without external components (non-inverting single pole invert-er circuit, quadrature hybrid, etc.).

    Thanks,

    Brandon