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Step-up transformers with non-buffered, wide-band ADCs

Sannatizer35
Intellectual 1110 points


Can I use a step-up transformer to drive the inputs of a non-buffered, wide bandwidth ADC? Something on the order of a 4:1 ratio? Also, how does the signal bandwidth and IF affect if such a set-up can provide good performance?

  • 0
    TI__Intellectual 1965 points

    Dear Mr. Sanna-tizer,

    If you are in the 1st 100MHz or so, it might be possible, if the target matching impedance is 25ohms, maybe 50.   At higher frequencies or target impedances, the non-buffered ADC's impedance is falling too quickly.  Simulations suggest with a buffered ADC and a target of 50ohms, still might be limited to first 100Mhz or so.  But, it depends on how much gain droop across your band and how high a VSWR you can tolerate.

    thanks for your interesting question,

    Philip Pratt