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i mean ,,using opamp we can make all circuit such as oscillator ,amplifier , comparator, pulse generator....so i ask any circuit can't make using opamp
Professors love to say that you can make anything out of them.
But that would be if you're willing to do it big, slow and expensive.
Which you'd think aren't values of the engineering curriculum.
Circuits you can't make, include those that have to be well
faster than the (say) 10X-gain-stable bandwidth of said op amp.
And those that require bidirectional signal transport, like RF or
analog switches / multiplexers.
A more important question generally is, "is an op amp really
the smart way to do it?". But that seems to not be quite as cute
a the generalization.
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