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Measurements >> Other Measurements >> AC grounded with Ci=1uF fotr diff input
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Message started by dandelion on Dec 17^th, 2006, 5:32pm

Title: AC grounded with Ci=1uF fotr diff input
Post by dandelion on Dec 17^th, 2006, 5:32pm

Hi,
In some product, the 1st stage is the differtial amp stage. In measuring some spec,like PSRR,output reffred noise, the test condition need "Inputs ac-grounded with Ci=1uF",

Is it to prevent the high freq noise coupled into the input?

Alos,do u think the "Inputs ac-grounded with Ci=1uF" means every diff input connect a Ci=2uF to ground,respectively? Or it means a Ci=2uF connected the two diff input directly? For the two caes, the cap value has two times difference.

Thanks