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For the following model circuit, derive the input resistance seen by Vs. (10pts)

For the following model circuit, derive the input resistance seen by Vs. (10pts)

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  1. For the following model circuit, derive the input resistance seen by Vs. (10pts)

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Electronics 2 - Homework 2 Second semester 2023-2024 Solve the following questions, and verify your solution using LTSpice. simulation. For each question you need to:Solve the question by handProvide a screenshot of the circuitProvide a screenshot confirming the hand calculations Note that you can change the BJT parameter Beta by adding a SPICE directive and changing the parameter BF Question 1: BJT transistors The parameters for each transistor in the figure below are β = 80, and VBE(m) = 0.7 V. Determine all the voltages and currents in the circuit. Circuit for question 1 Question 2: Amplifier Configurations The signal source in the circuit below is vs = 5 sin⁡(100000πt)mV. The transistor parameters are β = 120, and the capacitors are 10 μF (a) Design the circuit such that IC = 0.25 mA and VCE = 3 V. (b) Find the open circuit voltage gain Avo (c) Find the input resistance Rin (from the base of the transistor) (d) Find the output resistance (e) Use the amplifier model (Avo, Rin, Ro) to find vo(t). Circuit for question 2 Question 3: Amplifier Configurations Consider the circuit shown. The transistor current gain β = 180. and the source signal has a frequency of 100 kHz and the capacitors are 10 μF Note that the current source is replaced by an open circuit in the small signal model equivalent circuit. Determine: (a) the voltage gain from source to load, (b) the input resistance seen by the source (c) the output resistance

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4. The op-amp in the circuit has an input resistance of 400kΩ, an output resistance of 4kΩ, and an open-loop gain, A, of 200,000. Assume the opamp is operating in its linear region. a. Calculate the voltage gain (vO/vS) of the amplifier. b. Calculate the value of vl in µV when vS = 1 V. c. Calculate the resistance seen by the signal source vS (we usually call this the input impedance of the amplifier circuit). d. Repeat (a), (b), and (c) using the ideal model for the op-amp.
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