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AD8031 PSRR Simulation in LTspice

Hi,

for my next course about PSRR, I try to simulate the AD8031 PSRR with LTspice.

The used schematic is : 

Result is : 

This is very different from the datasheet graph (i.e. figure 35).

How explain that ?

Best regards.
Eric PERONNIN

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  • Hi,

    as a complement, I've done a time domain analysis with that schematic : 

    It uses a BV source with 5V plus decade sinus (for 1k, 10k, 100k and 1MHz). Each spectral lines has a weight of -23dB in the FFT analysis. FFT on the output has given that result : 

    As you can see, this result is consistent with the AC analysis : the -88dB at 1MHz plus 23dB give -65dB which is the result at 1MHz with the AC analysis and so one for the other spectral lines.

Reply
  • Hi,

    as a complement, I've done a time domain analysis with that schematic : 

    It uses a BV source with 5V plus decade sinus (for 1k, 10k, 100k and 1MHz). Each spectral lines has a weight of -23dB in the FFT analysis. FFT on the output has given that result : 

    As you can see, this result is consistent with the AC analysis : the -88dB at 1MHz plus 23dB give -65dB which is the result at 1MHz with the AC analysis and so one for the other spectral lines.

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