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Entry  Sun Jul 24 20:36:03 2011, haixing, Summary, Electronics, AA filter tolerance analysis 6x
    Reply  Sun Jul 24 20:47:21 2011, rana, Summary, Electronics, AA filter tolerance analysis 
       Reply  Sun Jul 24 22:19:19 2011, haixing, Summary, Electronics, AA filter tolerance analysis low_pass_new.png
          Reply  Tue Jul 26 21:11:40 2011, haixing, Summary, Electronics, AA filter tolerance analysis 
Message ID: 5038     Entry time: Tue Jul 26 21:11:40 2011     In reply to: 5024
Author: haixing 
Type: Summary 
Category: Electronics 
Subject: AA filter tolerance analysis 

Given this new setup, we realized that the previous tolerance analysis is incorrect. Because the uncertainty in the capacitance value
does not affect the common mode rejection, as two paths share the same capacitor. Now only the imbalance of two resistors is relevant.
The error propagation formula goes as follows:


We require that the common-mode rejection error at low frequency up to 8kHz, namely
with , one can easily find out that the corner frequency needs to be around 24kHz.


 

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