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The Designer's Guide Community Forum › Design › Analog Design › Common-mode point for OPamp
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Common-mode point for OPamp (Read 1904 times)
nxing
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Common-mode point for OPamp
May 01st, 2008, 12:07pm  
Hello everyone,

I have a question regarding how to setup the output common-mode voltage before connect the CMFB circuit. Should these points be close to what ever we want (for example, vdd/2) or it doesn't matter as long as the we can correct them with CMFB circuit?

Thanks!

Norman
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HdrChopper
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Re: Common-mode point for OPamp
Reply #1 - May 1st, 2008, 2:24pm  
Hi Noman,

The CM voltage should be selected in order to guarantee the required differential signal excursion. Then the CMFB will be the one forcing such CM level and will obviously have to be designed for working at those levels.

Regards
Tosei
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