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 ?
Since you are using single supply, add a DC offset in the non-inverting input to use the whole range of input common-mode voltage range. Below is the PSRR graph obtained when I add 2.5V in non-inverting input. It resembles Figure 35 in the data sheet. Simulations are dependent on the part modeling and may present some limitations thus the low accuracy in the low frequencies.