Suppose a certain audio power amplifi er gives where the second term at the right-hand side represents 120-Hz hum that the amplifi er picks up from its own crudely-designed power supply. Rather than...

Suppose a certain audio power amplifi er gives

where the second term at the right-hand side represents 120-Hz hum that the amplifi er picks up from its own crudely-designed power supply. Rather than switching to a cleaner but more expensive supply, an engineer decides to reduce the output hum by exploiting the curative properties of negative feedback. (a) Using a suitable op amp, design a feedback circuit that accepts an input vI (t) and gives vO(t) 5 1.0vI (t) 1 (50 V)cos(2 required GBP? (b) Repeat, but for vO(t) 5 10vI (t) 1 (50 V) 3 cos(2120t).