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How to evaluate Q factor of a 2nd order Low Pass filter when no overshoot with PSPICE ?

FlBe

Hi,

I use the "Q-Bandpass" measurement to evaluate the Q factor of a Low pass Sallen Key filter (2nd order).

If the response presents an overshoot (Q>1), this evaluation works fine but when there is no overshoot because Q is < 1, PSPICE is not able to evalute it.

Q is equal to square root of (R1*R2*C1*C2) / (R1+R2) / C2. Therefore how to evaluate this formula with the values in my schematic ?

The purpose is to evaluate Q in MONTE-CARLO analysis but with Q = 0.7 < 1.

Thank you in advance for your help. 

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