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How to correctly evaluate VCC rail filtering on circuit performance?

Category: Hardware
Product Number: LT1328

Hello,

I have met difficulty evaluating the performance of the LT1328 based on different rail filtering parameters. In my simulation model, I emulate noise on the +5V rail and try to filter it using decoupling capacitor and a ferrite bead. The simulation results are disastrous: the output always experiences a data flow interruption for different L1/C4 parameter combinations. It also varies depending on the maximum .tran step.
Any ideas ?

 LT1328_test.asc

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