2. Calculate the gain, input, and output impedances of a voltage-series feedback amplifier having A= -300, Z= 1.5 k2, Z,= 50 k2, and B= 1/15.
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- 3. An ideal shunt-shunt feedback amplifier has Rs =∞. If li= 100 microAmp, I fb = 99 microAmp and Vo = 5V determine: a. Az, Bg and Azf, (including the units) b. Rif & Rof if Ri= 5 Kohm & Ro = 4 Kohm.Assume that the R2/R1 ratio of a feedback amplifier with voltage supply of +/- 10 V is 3.4 and that a value of 8.5 V is applied to the inverting input of the op-amp. What is the output voltage value?An ideal shunt-shunt feedback amplifier has Rs =∞. If li = 100 microAmp, I f = 99 microAmp and Vo = 5V determine: a. Az, Bg and Azf, (including the units) b. Rif & Rof if Ri= 5 Kohm & Ro = 4 Kohm.
- Feedback: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.Given the feedback circuit below and assuming the voltage amplifier has gain A₂, input resistance R₁ and output resistance Ro, answer the following questions: + a. Loop gain b. Closed loop gain Re C. Input resistance d. Output resistance Rin м + RE A) Sketch the feedback small signal model of this circuit. (Hint: You may convert the input VIN and source resistance Rs to its Norton current equivalent if needed) B) Find the following in terms of the amplifier parameters and resistances R, and RF: RoutQ1. The voltage gain of an amplifier without feedback is 3000. Calculate the voltage gain of the amplifier if negative voltage feedback is introduced in the circuit. Given that feedback fraction mv = 0.01.
- Consider the ideal shunt-series feedback amplifier in Figure below. Assume that the source resistance le 4 is Rs = 00. (a) If I = 100 µA, I fh (b) Using the results of part (a), determine Rif and Rof, for Ri = 5 kN and R, = 4 kN. 99 µA, and I, = 5 mA, determine A, B, and G, including units. %3D2-) 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.Discuss what type of feedback will you use in an amplifier to : 1 ) : increase input impedance 2): decrease input impedance , and why ?
- Q.2A Answer the following questions: 1. Calculate the gain of a negative-feedback amplifier having A (gain without feedback)= -2000 and B (feedback)= -1/10.Consider a voltage series feedback network, where amplifier gain = 100, feedback factor = 5. For the basic amplifier, input voltage = 4V, input current=2mA. Find the input resistance of the network.Q. One advantage of having feedback in op amp circuit is A. low gain B. low bandwidth C. can control gain D. high output voltage E. less input signal F. less complicated