Consider the ideal shunt-series feedback amplifier in Figure 12.9. Assume that the source resistance is
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Microelectronics: Circuit Analysis and Design
- The feedback amplifier in Figure 1 has Rs = 20kΩ, R1 = 10kΩ, R2 = 100kΩ, R3 = 100kΩ and RL = 10kΩ. Ituses an operational amplifier with the following parameters:• Open-loop gain a = 100,000 V/V• Input resistance ri = 200kΩ• Output resistance ro = 100Ω Find the following closed-loop parameters of the circuit, taking into account the loading effects of the sourceresistance, the load resistance and the feedback network:(a) Feedback factor ƒ(b) Voltage gain Avƒ = vL /vs(c) Input resistance Rinƒ(d) Output resistance Routƒarrow_forwardFeedback:2. An ideal series-shunt feedback amplifier has Rs negligibly small. If Vi = 100mV, Vfb =99mV, and Vo= 5V determine:a. Av , β, Avf (including the units)b. Rif, Rof if Ri = 5 Kohm & Ro = 4 Kohm.arrow_forwardThe open-loop transfer function of a unity feedback system is given by G(s)=(5(s+1))/(s2(s+2)). The stability characteristics of the open-loop and closed-loop configuration are respectively: Choices: stable and stable unstable and unstable unstable and stable stable and unstablearrow_forward
- For the unity feedback system given below, the damping ratio of the closed looppoles is given by a) 1.5 b) 1 c) 0.5 d) 0.25arrow_forwardA unity feedback system has the following open loop transfer function, Determine the value of Gain and B for this system assuming that it oscilates at 3 rad/sec G(s)= K(s+2)/s^3 + bs^2 + 3s + 2arrow_forwardThe margins of stability for K = 12 of the unit feedback system shown in the figure are given below. Phase crossover frequency : Wfc = 2rad/s Gain crossover frequency: wgc = 1.4rad/s Phase Margin = 16.8 degree Amplitude Margin Kg = 6dB (NOTE: Use 3 decimal places in your operations.) a) Calculate the amplitude margin for K 60. b) Calculate the point where the KG(jw) Nyquist Diagram intersects the negative real axis for K 60.arrow_forward
- 1. Given the operational amplifier below.a. Solve for the input voltage, if the feedback resistors value is 10kOhm, and input resistance is 2kOhms and has an output voltage of -3V.b. Determine the input impedance of the given amplifier if the open-loop input impedance is 1MΩarrow_forwardA. If the forward gain is 5 and feedback gain is 1, determine the close-loop gain of a negative feedback amplifier. answer: B. For a Wien-bridge oscillator (as presented in the lecture), if the feedback resistor has a value of 10-kohm, determine the value of Ri (in kilo-ohm). answer:arrow_forward2-) The AC equivalent of a feedback amplifier circuit is given in the figure on the right. (Hfe100, Va = ∞, Ic1 = 15 mA, Ic2 = 5mA and Ic3 = 5 mA) a) State the type of feedback used in the circuit, explaining the reason. b) Draw the small signal equivalent of the amplifier circuit. c) Calculate the value of β for the feedback by drawing the β circuit. d) Find the Avf = Vo / Vs closed loop gain of this circuit. e) Find the Rif and Rof values.arrow_forward
- . Given a unity feedback system where G(s) = K / sn(s + a) find the values of n, K, and a to meet specifications of 15% overshoot and Kv = 100arrow_forwardConsider the feedback system given the open loop transfer function below G(s)H(s) = K / ( S (s+3) (s+2)) a) Using the Routh-Hurwitz criterion, for which value of K, the poles of the closed-loop system take the pure imaginary value.b) What will be the maximum value of K for the system to be stable?c) Calculate the value of K, where the real value of the complex root of the system is Re{s}=-1. Tip 1: Closed loop transfer function T(s) = G(s) / ( 1+ G(s)H(s)) .Routh HurwitzIn order to perform the criterion analysis, the denominator of the closed-loop function will be examined. Tip 2: The real value of the system complex root Re{s}=-1 is expressed by the following formula f^2(s) = p(s-1) p(s) is the payoff of the closed-loop function.arrow_forwardQ : A specific feedback control system has the loop gain function: L(s) = Gc(s)G(s)H(s) = K (s + 2) / S(s-1): Sketch the root locus for L(s) for K>0, including full specification and labeling of any breakaway points and imaginary axis crossings. Determine the values of K that correspond to any breakaway points and imaginary axis crossings. State the range of K for which the closed loop system is stable.arrow_forward
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