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Find the voltage gain and input resistance of the amplifier in the following circuit. Assume Q1 and Q2 are matched and they have a β = 100.

Find the voltage gain and input resistance of the amplifier in the following circuit. Assume Q1 and Q2 are matched and they have a β = 100.

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  1. (20) Find the voltage gain and input resistance of the amplifier in the following circuit. Assume Q 1 and Q 2 are matched and they have a β = 100 .

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In the amplifier circuit, given VCC = 10 V, R1 = 160 kΩ, R2 = 40 kΩ, RC = 2 kΩ, and RL = 2 kΩ, answer the following questions. Assume the BJT has a β = 100. (a) Calculate RE to make the BJT's operating point (Q-point) current ICQ = 2 mA. (b) Assuming ro = ∞ and CE = ∞, draw the small-signal equivalent circuit of the amplifier and calculate the amplifier's input resistance (Rin), output resistance (Rout), and voltage gain (Av). (c) Assuming ro = ∞ and CE = 0, draw the small-signal equivalent circuit of the amplifier and derive the expression for the voltage gain (Av). Then, calculate the value of Av. (d) Assuming ro = 10 kΩ and CE = 0, draw the small-signal equivalent circuit of the amplifier and derive the expressions for Rin , Rout , and Av. Then, calculate their values. (e) To operate as an amplifier, in which operating region should the BJT be biased? Explain the reason with the help of the voltage transfer characteristic.In the amplifier circuit, given VCC = 10 V, R1 = 160 kΩ, R2 = 40 kΩ, RC = 2 kΩ, and RL = 2 kΩ, answer the following questions. Assume the BJT has a β = 100. (a) Calculate RE to make the BJT's operating point (Q-point) current ICQ = 2 mA. (b) Assuming ro = ∞ and CE = ∞, draw the small-signal equivalent circuit of the amplifier and calculate the amplifier's input resistance (Rin), output resistance (Rout), and voltage gain (Av). (c) Assuming ro = ∞ and CE = 0, draw the small-signal equivalent circuit of the amplifier and derive the expression for the voltage gain (Av). Then, calculate the value of Av. (d) Assuming ro = 10 kΩ and CE = 0, draw the small-signal equivalent circuit of the amplifier and derive the expressions for Rin , Rout , and Av. Then, calculate their values. (e) To operate as an amplifier, in which operating region should the BJT be biased? Explain the reason with the help of the voltage transfer characteristic.
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ajiv Gandhi University of Knowledge Technologics (Department of Electronics and Communication Engineering) MONTHLY TEST - 2 Year/Sem: E2-SEMII Subject: AEC Subject Code:23 EC2101 Date: 17-10-2023 Time: 45 Minutes Max. Marks: 15 Marks Section-A ― Answer the following question. (1 X7 = 7 Marks)a) For the common source amplifier as shown in fig below, Given μaCnt(W/L) = 0.25 mA/V2, Vm = 1.5 V, VA = 50 v (use VA for riscalculation (x≠0) then. Find MILLER'S THEOREM i) small signal voltage gain ii) input resistance and output resistance iii) maximum allowable imput signal (OR)For the Differential amplifier as shown in fig below, Given μ2 Cin = 100 μA/V2, Vti = 1 V, +VDD = +5 V, −VSS = −5 V; Neglect Channel length modulation. Assume M1 and M2 are matched(identical) transistors. find V1, V2 and V3 for the following cases a) (W/L)1 = (W/L)2 = 20 b) (W/L)1 = 1.5(W/L)2 = 20; Section-B Answer the following question. (1 8 = 8 Marka)a)for the MOSFETS shown in circuit μ3 Cm = 50 μA/V2, Vm = 1 V, L = 1. μm, w = 10 μm then find the V 3 and 13 in the circuit. b) For the Differential amplifier given below, Given μnCn = 1 mA/V2, Vn

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Assume the source follower is connected as a buffer amplifier between terminals 1 and 2 of the first figure (instead of the wire shown connecting them originally). The capacitors are large enough to act as short circuits at the frequency of interest. Find a value for RG that makes the AC voltage at the gate vg = 0.8Vgen. Then calculate the buffer amplifier gain VL/vg = AV, using the formula AV = RL/ 1/gm+RL Finally, calculate the buffered lossLB = 20log10(Vgen/VL) with the buffer inserted in the circuit. The value of LB should be considerably smaller than the original L, showing that although source followers have a voltage gain less than 1 , they can prevent significant losses when impedances are mismatched as at the beginning of this problem.

Assume the source follower is connected as a buffer amplifier between terminals 1 and 2 of the first figure (instead of the wire shown connecting them originally). The capacitors are large enough to act as short circuits at the frequency of interest. Find a value for RG that makes the AC voltage at the gate vg = 0.8Vgen. Then calculate the buffer amplifier gain VL/vg = AV, using the formula AV = RL/ 1/gm+RL Finally, calculate the buffered lossLB = 20log10(Vgen/VL) with the buffer inserted in the circuit. The value of LB should be considerably smaller than the original L, showing that although source followers have a voltage gain less than 1 , they can prevent significant losses when impedances are mismatched as at the beginning of this problem.

Assume the source follower is connected as a buffer amplifier between terminals 1 and 2 of the first figure (instead of the wire shown connecting them originally). The capacitors are large enough to act as short circuits at the frequency of interest. Find a value for RG that makes the AC voltage at the gate vg = 0.8Vgen. Then calculate the buffer amplifier gain VL/vg = AV, using the formula AV = RL/ 1/gm+RL Finally, calculate the buffered lossLB = 20log10(Vgen/VL) with the buffer inserted in the circuit. The value of LB should be considerably smaller than the original L, showing that although source followers have a voltage gain less than 1 , they can prevent significant losses when impedances are mismatched as at the beginning of this problem.
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