2. Plot the open loop response on the Nichols chart for a system with unity feedback and an open loop transfer function G(s) = Determine the following. The phase margin (17°) The gain margin (-4 db) 5 (s + 0.5)(s + 1)(s + 1.5) The peak magnification and the frequency at which it occurs (12 db and 1.4 rad/s) The band width (about 2 rad/s)

Design an inverting summing amplifier so that vo = -( 3v₁ + 5vb + 4vc + 2va) . If the feedback resistor (RF) is chosen to be 60 kn, draw a circuit diagram and specify the values of Ra, Rb, Rc and Rd.

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Q) In the negative feedback the low frequency and the high frequency * :with the feedback are (a) flf= fl /(1+AB) and fhf= fh /(1+Aß), where flf = low frequency with feedback (b) fhf= fh /(1+AB) and flf= fl (1+AB), where fhf = high frequency with feedback (c) flf= fl (1+AB) and fhf= fh (1+AB) (d) fhf= fh (1+AB) and flf= fl /(1+AB) O