8–78 The two competingOPAMP circuits in Figure P8–78 are operating in the sinusoidal steady state with ω = 100 krad=s.

The two manufacturers both claim that their circuit meets the following specifications:

(a) Find the magnitude of the ratio of the output phasor V2 to the input phasor V1 at each specification frequency for each circuit.

(b) UseMATLABto plot the log of jV2=V1j versus the log of the frequency ω. Comment on the function of the circuit from the plot.

(c) Use Multisim and do an ac sweep from 100 rad=s to 100 Mrad=s (recall Multisim uses Hz) and comment on the function of the circuit from the plot by Grapher View.

(d) Which circuit would you buy, if either? Explain

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Voltage gain at 100 krad/s must be 1.414. Voltage gain as co must approach 0. Voltage gain at de must be 2.0. Cost: Circuit (a) $1.25 each, or $0.50 in quantity, circuit (b) $1.05 each, $0.60 in quantity.