HomeWork 3 (FeedBack) 1- For the following circuit, compute the voltage at point \( X, Y, Z \), the output voltage, and the closed-loop gain both ideal and actual (for the circuit inside the feedback network).
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The input voltage is \( 50 \, \text{mV} \) and the gain of the first amplifier is 20. Therefore, the voltage at point \( X \) is: \[ V_X = 50 \, \text{mV} \times 20 = 1000 \, \text{mV} = 1 \, \text{V} \] Show more…
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A feedback op-amp circuit is shown in the figure below. In the circuit, R_s = 2kΉ, R_1 = 10kΉ, R_2 = 10kΉ, R_3 = 5kΉ, and R_L = 2kΉ Part 1: The op-amp is non-ideal with an internal input resistance r_i = 200kΉ, an internal output resistance r_o = 200Ή, and an internal gain A_vo = 20 kV/V. Apply the systematic analysis method. (1) What is the feedback topology of the circuit? (2 marks) (2) Calculate the feedback factor Β. (2 marks) (3) Calculate the open-loop gain A of the circuit. (5 marks) Part 2: Now let's assume the op-amp is ideal with infinite internal gain. (4) Find the expression of the output voltage v_o as a function of the source signal v_s. (5 marks)
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A feedback op-amp circuit is shown in the figure below. In the circuit, ( R_{s}=2 k Omega, R_{1}=10 k Omega, R_{2}=10 k Omega, R_{3}=5 k Omega ), and ( R_{L}=2 k Omega ) Part 1: The op-amp is non-ideal with an internal input resistance ( r_{i}=200 mathrm{k} Omega ), an internal output resistance ( r_{o}=200 Omega ), and an internal gain ( A_{v o}=20 frac{k V}{V} ). Apply the systematic analysis method. (1) What is the feedback topology of the circuit? (2 marks) (2) Calculate the feedback factor ( beta ). (2 marks) (3) Calculate the open-loop gain ( A ) of the circuit. (5 marks)
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