• Electrical Engineering Archive: Questions from 2024-09-6

    (a) For the common emitter amplifier circuit shown in Figure Q5 (a), Calculate: (i) The output voltage (ii) The ac input resistance. (10 marks) (4 marks) Figure Q5 (a) (b) Figure Q5 (b) shows the circuit of an operational amplifier. (i) Name the types of Op Amp 1, Op Amp 2, and Op Amp 3. (ii) Calculate the output voltage V0. (2 marks) (4 marks) Figure Q5 (b)
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    A 80.1-Ω resistor is connected in parallel with a 175.7-Ω resistor. This parallel group is connected in series with a 23.9-Ω resistor. The total combination is connected across a 19.3-V battery. Find (a) the current and (b) the power dissipated in the 175.7-Ω resistor. (a) Number Units (b) Number Units
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    For the circuit in Fig. E2.6 determine the values of v1, i1, i2, v0, iL, and iO. Also determine the voltage gain vO/vI, current gain iL/i1, and power gain PO/P1. Ans. 0 V; 1 mA; 1 mA; −10 V; −10 mA; −11 mA; −10 V/V (20 dB), −10 A/A (20 dB); 100 W/W (20 dB)
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    Required information Consider the given instrumentation amplifier with the resistance values R1 = 27 kΩ, R2 = 93 kΩ, R3 = 34 kΩ, and R4 = 50 kΩ. What is the output voltage if v1 = (4 − 0.2sin⁡4,000πt) V and v2 = 3.5 V? Multiple Choice vO = (−5.42 + 1.25sin⁡4,000π) V vO = (5.42 − 1.25sin⁡4,000π) V vO = (−5.5 + 1.90sin⁡4,000π) V vO = (5.5 − 1.90sin⁡4,000π) V vO = (−7.63 + 3.3sin⁡4,000π) V vO = (−3.27 + 1.308sin⁡4000π) V
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    Required information A single-pole op amp has an open-loop gain of 92 dB and a unity-gain frequency of 1 MHz. The op amp is used in a noninverting amplifier designed to have an ideal gain of 48 dB. Find the bandwidth of the noninverting amplifier. Repeat for an inverting amplifier with an ideal gain of 48 dB. (Round the final answer to one decimal place.) For a noninverting amplifier, fH = kHz. For an inverting amplifier, fH = kHz.
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    The following figure shows a voltage amplifier having an input resistance Ri, an input capacitance Ci, a gain factor μ, and an output resistance R0. The amplifier is fed with a voltage source Vsig having a source resistance Rsig, and a load of resistance RL is connected to the output. Assuming Rsig = 20 kΩ, Ri = 100 kΩ, μ = 144 V/V, RO = 200 Ω, RL = 1 kΩ, and the capacitor Ci = 340 pF. Find the magnitude of the total transfer function |T(ω)| = |Vout (ω)/Vsig (ω)|, where ω = 2π124×103 rad/sec. Express your answer in dB
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