Lecture4 opamp circuits

OP-AMP OPERATION AMPLIFIER... Why is this circuit useful ?... Another way of solving – using Laplace Transform... Without negative feedback, or with positive feedback , an op-amp acts as

OP-AMP OPERATION AMPLIFIER

Why is this circuit useful ?

Another way of solving – using Laplace Transform

Taking the challenges :

 Without negative feedback, or with positive feedback , an op-amp acts as a comparator

If v+ > v-  = maximum positive voltage (+Vsupply)

If v+ > v-  = maximum negative voltage (-Vsupply)

Since there is no feedback or positive feedback from the output to input, the circuit acts as a comparator The circuit's gain is just the A (infinite gain) of the op-amp

Comparator

Bi-stable circuit

Schmitt trigger circuit

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