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simple low pass RC filter in CMOS process

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tia_design

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CIrcuit is very simple, just 1st-order low pass RC filter. If I use R and C from analogLib library, which give ideal R and C value. I got the -3dB bandwidth fc1. If I use R and C from my technology library with the same R and C value and model is typical, I got another -3dB bandwidth fc2. And fc2 is bigger than fc1. What could be the reason giving this difference. Thanks!
 

Different models? All depends on modeling...:)
 

tia_design said:
... If I use R and C from my technology library with the same R and C value and model is typical, I got another -3dB bandwidth fc2. And fc2 is bigger than fc1. What could be the reason giving this difference. Thanks!
Click to expand...

R and C from your tech. lib are non-ideal devices, R has additional C's (in parallel to R, and also to the surrounding substrate), and C may have additional R's in a similar configuration, which create another pole. Just study the model files of these R & C .
 

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