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Message started by chungming on Jan 5th, 2009, 7:09pm

Title: question about psrr simulation
Post by chungming on Jan 5th, 2009, 7:09pm

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 3mV sin wave , equal -10.5dB.

what result is meaningful ?

Title: Re: question about psrr simulation
Post by thechopper on Jan 6th, 2009, 6:42pm

Hi chungming,

Could you clarify how you are measuring your psrr? That would help
Is the dc bias point for which you run your ac analysis the same one you are using for your transient analysis?

Regards
Tosei

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