|Aug15-12, 11:44 AM||#18|
[Circuit Analysis] Hard Time to Decide...
Very interesting fact. Does this apply to amp's when connected to capacitors or inductors? AC too?
|Aug15-12, 11:52 AM||#19|
However, you will likely approach these problems differently as you will likely be looking for frequency response. Op amps can be filters. That being said, nodal analysis will still work, the math will just be much tougher because of the JWL and 1/JWC. YOu will also use bode plots to plot the frequency response.
If you take a op amp that does have caps and inductors or whatever, and a DC signal is used....the caps will open and the inductors will short as you know.
When dealing with frequency response, the op amps in school will typically take the -RF/RA approach...or the (1+RF/RA) approach. But you can always fall back on node analysis......what you are ussually looking for in these ideal op amps is the transfer function....or gain. Gain =Vout/Vin.
Btw....if you take a simple op amp that uses the above formula....simply do a nodal analysis on one of these simple ones and you will derive the two formulas above. Do it, it is worth the exercise.
|Aug15-12, 06:57 PM||#20|
An even older (not newer) book that might fit the bill a little better is "Basic Circuit Theory" by Desoer and Kuh. Used copies at amazon go for something like $15-$20. I think it is quite good, is more rigorous than the standard intro book, but starts a little more at the beginning of the subject. My copy is at work, but if I recall correctly it was written for Junior level classes at Berkeley, so would probably be good to at least have a good elementary level book to look at first.
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