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
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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:
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- An amplifier has an open-loop voltage gain of 90 dB, Rid = 50 kΩ, and Ro = 5000 Ω. The amplifier is used in a feedback configuration with a resistive feedback network. (a) What is the largest current gain that can be achieved with this feedback amplifier? (b) What is the largest transconductance that can be achieved with this feedback amplifier?An amplifier has an open-loop gain of 92 dB, Rid = 75 kΩ, and Ro = 1400Ω. The amplifier is used in a feedback amplifier configuration with a resistive feedback network. (a) What is the largest value of current gain that can be achieved with this feedback amplifier? (b) What is the largest valuetransconductance that can be achieved with this feedback amplifier?Find the loop gain, ideal transconductance, actual transconductance, input resistance, and output resistance for the feedback amplifier as shown with RI =15 kΩ, RL =20 kΩ, and R1 =6kΩ.
- The classic feedback amplifier as shown has β =0.125. What are the loop gain T, ideal closedloop gain AIdeal v , actual closed-loop gain Av, and the fractional gain error FGE if (a) A =∞? (b) A =84 dB? (c) A =20?Find the loop gain, closed-loop current gain, input resistance, and output resistance for the shunt-series feedback amplifier as shown, if R1 and R2 are increased in value by a factor of 10.(a) Calculate the sensitivity of the closed-loop input resistance of the series-shunt feedback amplifier with respect to changes in open-loop gain A:SRinA = A/ Rin ∂Rin/ ∂A (b) Use this formula to estimate the percentage change in closed-loop input resistance if the openloop gain A changes by 10 percent for an amplifier with A = 94 dB and β = 0.01. (c) Calculate the sensitivity of the closed-loop output resistance of the series-shunt feedback amplifier with respect to changes in open-loop gain A:SRout A = A /Rout ∂Rout /∂A (d) Use this formula to estimate the percentage changeinclosed-loopoutputresistanceiftheopenloop gain A changes by 10 percent for an amplifier with A =100 dB and β =0.01.
- Find the loop gain, ideal voltage gain, actual voltage gain, input resistance, and output resistance for the feedback amplifier shown if a 4-kΩ load resistor is connected to the output of the amplifier.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.Q1/ (a) A negative-feedback amplifier has a closed-loop gain of Af=100 and an open-loop gain of A =5 x 10*. Determine the feedback transfer function p. (b) If p=10.012 and Af = 80, determine the open-loop gain A.
- 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.An amplifier has voltage gain with the feedback of 100. If the gain without feedback changes by 409 and the gain with feedback should not vary more than 8%, the values of open-loop gain and feedback ratio will be respectively given byThe 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?