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equation 7.99

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Pupil
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Date Posted: 7/19/2008 11:44:10 AM  Status: Live
equation 7.99
Course Textbook Chapter Problem
Digital Circuits Microelectronic Circuits (5th) by Sedra, Smith 7 40P
Question Details:
   why in this problem the Acm is not positive but in equation 7.99 negative?
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Oracle
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Date Posted: 7/20/2008 11:22:54 AM  Status: Live
Asker's Rating: None Provided    Moderator's Rating: Lifesaver
Response:
 
The common mode gain is given by
Where negative sign indicates the phase difference bewteen the input and the output.
The magnitude of the commom mode gain is
Hence the magnitude is positive.
 
 



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