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question about psrr simulation

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chungming

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psrr simulation

Hi ~
i have an LDO regulator. and i simulate it psrr.
i found it crossover 0db at about 90kHz (max +14dB).
but if i use a 10mV 90kHz sin wave , the output have only 6mV sin wave , equal -4.4dB.

what result is meaningful ?
 

psrr with transient simulation

Transient simulation of course. AC computes solution around linearized circuit.

The same thing for AC stability which always has to be confirmed by transient simulations.
 

Transient results tells a real response. AC helps you to analyse but can't tell the true reaction!
 

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