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Explain why the input impedance of OP-Amp is so high?
In OPAMP, we have 4 stages, 1st stage, i.e the input stage is a dual i/p balanced o/p opamp whose i/p resistance is v high.
And if we use FET in case of BJT for 1st stage diffamp, then i/p resistance will be v high in M ohms.
And if we use FET in case of BJT for 1st stage diffamp, then i/p resistance will be v high in M ohms.