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LTspice FRA feature

Category: Software
Product Number: LTC3311S
Software Version: 17.2

 I’m using the LTspice 17.1.4 and facing some problem in using the new fra feature.

In principle the FRA stimulus will has low amplitude at high frequency, and high amplitude at low frequency.

But in my simulation. only frequency has changed, but the magnitude never changes (always stay at pp1 amplitude). will this affect my simulation result?

how to solve this kind of problem?

6507.LTspice with .fra.asc