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LP5900 improve PSSR at freqs >1 MHz

Eric Hooker1
Prodigy 170 points
Other Parts Discussed in Thread: LP5900

Hello,

How can I improve LP5900 PSSR at frequencies >1 MHz?  How much does it improve if Vin is increased?  Does a RF output bypass cap help or is an external LPF the only solution?  My application is a microwave band VCO and it's very sensitive to power supply noise.

Thanks,

Eric

  • 0
    TI__Prodigy 40 points

    Hello Eric,

    The bandwidth of the LP5900 limits the PSRR to be effective up to 100kHz regardless of VIN. Beyond 100kHz, your selection of external components will provide the filtering. I would suggest going with a LPF design if you need to filter  past 1MHz.