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LMX2572: Is the RF synthesizer LMX2572 output a sinusoidal waveform?

John Jiang1
Prodigy 100 points
Part Number: LMX2572

I need to output a sinusoidal signal from 20MHz ~ 2GHz. According to the datasheet of LMX2572, the second and third harmonics is -37 and -13dBc at output of 3.2GHz, is it the same for other frequencies? From the harmonics value, it seems that the output is more a square wave than sinusoidal signal, so do I need to put a low pass filter to get a sinusoidal wave? But the application needs to generate 512 sinusoidal waves ranging from 20MHz ~ 2GHz for each scan, so a single 2GHz LC low pass filter won’t work. Any suggestion, or this IC is not intended for this type of application? Thanks.

  • +1
    TI__Guru* 93560 points

    Hi John,

    Whenever a high frequency signal goes through a divider, the output signal format is a square wave because the divider is in fact, a counter. 

    To get wide band sine wave signals, in addition to the synthesizer, I think you need more building blocks in the system.