(b) A negative feedback of 12 dB is applied to an amplifier which has an open-loop gain A = 10,000. Find (i) voltage gain with feedback (ii) feedback factor.
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Solved in 2 steps
- A. 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:Ques 2: What is the Voltage series feedback? Explain the effect of feedback on gain and input, outputimpedance2. The closed-loop voltage gain of an inverting amplifier is equal toto. The relationship between input resistance and feedback resistanceb. The open loop voltage gainc. The feedback resistance divided by the input resistanced. input resistance.
- 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)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) 0.25Discuss the difference between the current series negative feedback amplifier and voltage shunt feedback amplifier in terms of output impedance, input impedance, voltage gain, bandwidth, distortion and noise.
- Analyze the circuit shown in Figure Shown.(i) Determine the type of negative feedback used in the circuit by showingthe suitable process. (ii) Derive the equation for the feedback factor and the gain of the circuit. (ii) Calculate the feedback factor and the gain of the circuit if R1 = 1.2 kΩ,R2 = 15 kΩ and RL = 6.8 kΩ.2-) 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.Example H.W: If the input impedance and voltage gain of an open loop voltage series feedback amplifier are 3KQ and 100. The feedback factor is % . Find the input impedance of closed loop amplifier.(ANS:9KQ).
- 2. Design a unity gain inverting summing amplifier that will output the sum of two input voltages. Use a feedback resistor of 2.5 Kohms.Consider a unity negative feedback system with loop transfer function shown in Figure where L(s)=GcG(s)=K(s2+6s+1)(s2+5s+1) Determine the value of K for which the closed-loop system is stable.In Negative Feedback Amplifier the gain without feedback is 200. Feedback ratio is 1/50 and if the input voltage is 100mV, calculate a) Gain with feedback b) Feedback Factor c) Output Voltage d) Feedback Voltage