Q2. Consider a unity-feedback system whose open-loop transfer function is: Y G(s) = R(S)= Ke-0.8s (s+1) Using the Nyquist plot, determine the critical value of K for stability? (
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- A unity-feedback system has forward transfer function (see attached). a) Sketch the root locus for this system as K varies from 0 to ∞; b) Use the Routh-Hurwitz test to determine the range of K for the system to be stable; show this value of K on the root locus plot.A For a monolithic negative feedback system defined by the open path function, find the gain range (to operate the system at steady stateThe circuit as shown is a shunt-shunt feedback amplifier. Use feedback analysis to find the midband input resistance, output resistance, and transresistance of the amplifier if RI = 500 Ω, RE = 2 kΩ, β0 = 100, VA = 50 V, RL = 5.6 kΩ, and RF = 47 kΩ, when vi and RI are replaced by a Norton equivalent circuit. What is the voltage gain for the circuit as drawn?
- The transistor parameters for the circuit shown are VTN = 0.4 V, Kn =0.5 mA/V2, and λ = 0.(a) Discuss the feedback topology, show the input ant output connections (series orshunt)(b) Find the feedback factor β (find the transfer function without feedback first)Assume for a moment that perfectly accurate resistors were available for feedback networks; that is resistor tolerance is 0%. Then any deviation from the value set by the feedback resistor ratio is caused by insufficient raw op-amp gain. What minimum raw gain would be needed to get within 1% if an intended overall gain of 10? What if the intended gain is 100 instead?Question 02: A system has a gain k in series with an open-loop transfer function given by G(s): a) Check, by means of the Routh-Hurwitz method, the range of values of k that makes the system stable. b) Also using the Routh-Hurwitz method, show what value of gain k makes the system response undamped. Calculate the value of the dominant poles for this case.
- An op amp has a dc gain of 100 dB and a unity-gain frequency of 10 MHz. (a) What is the bandwidth of the op amp? (b) If the op amp is used to build a noninverting amplifier with a closed loop gain of 60 dB, what is the bandwidth of the feedback amplifier? (c) Write an expression for the transfer function of the op amp. (d) Write an expression for the transfer function of the noninverting amplifier.Given in the figure is a two-stage amplifier design that employs negative feedback. Answer the following questions. Use the notation (R1 + R2 + ... + Rn) for series resistors and (R1 || R2 || ... || Rn) for parallel resistors for clarity and ease. Assume that the transistors are already biased properly in the saturation region and ro1 = ro2 → ∞. Also assume that the capacitors have infinite capacitance. 1.) Find the expression for the open loop gain Av 2.) Derive the resistance Rin which is the resistance that can be seen at the input port of the amplifierFind the desired values below in the feedback amplifier circuit in the figure. a) Find the no-load voltage gain in the amplifier circuit when the Rf resistor is open circuit. b) Voltage and current in amplifier circuit when Rf resistor is open circuit and RL resistor is present Find your earnings. c) When the Rf feedback resistor is connected, the Rf value that makes the feedback current gain Ai/3 find it. Indicate the assumptions you take in your transactions.
- Is this system internally stable? Now, consider the following feedback diagram: where ? denotes the system above. Is this new overall system internally stable? Comment on the result.Since G(s) is the transfer function of the system, draw the root locus of the closed-loop system with negative unit feedback below, clearly stating each step. (Root locus plots drawn using any program such as Matlab etc. will not be considered)Find the desired values below in the feedback amplifier circuit in the figure. a) Voltage and current in amplifier circuit when Rf resistor is open circuit and RL resistor is present Show step-by-step the formula that gives the profit. b) Step of the formula showing the feedback current gain Ai when the Rf feedback resistor is connected find step.