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The operational amplifier is a circuit with a high open loop gain, High input resistance and low output resistance...
There are op-amps with:
Differential input and single output
Single input and differential output
Differential input and differential output
Single input and single output
Many opamps have a diffential amplifier in theirs input circuit followed for a high gain circuit and in their output is a amplifier B class (op-amp 741)
I hope this can help you...sorry if you can't understand well this post but i dont write in english very well
OP amp includes one or more differential amplifiers. Normal OP amp has typically more than 4 stages so as to have the characteristics of the OP amp. The first two stages are typically differential amplifiers.
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