ELG 3136 HW3

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University of Ottawa *

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ELG 3136

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Electrical Engineering

Date

Jan 9, 2024

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pdf

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Uploaded by hgranger50

ELG3136 Fall 2023 Assignment 3 Posting Date: Saturday Sept 23, 2023 General instructions 1. Your equations and solutions may be hand-written, scanned into a PDF format. 2. A typed solution, with all relevant circuit diagrams drawn with VISIO (or other software), will be given a bonus mark of up to 10% the full mark 3. Once you have a PDF file for your entire assignment you can upload it to your account on the Brightspace. 4. Only one PDF file will be accepted.

ELG3136 - Fall 2023 Assignment 3 Consider the cascode amplifier circuit shown in Figure 2 below 1 , Figure 1 Specifications of the circuit shown below. Figure 2 Circuit Schematic Your Task You are required to design and construct the full circuit (including the DC biasing circuitry, coupling capacitors) in MultiSim. Important things to note in constructing the circuit. a. Add biasing DC sources/resistive networks to ensure the both transistors are biased in the satuation mode. b. Place an AC sinusoidal source of 1  V pk-pk (Peak to Peak) with 1kHz frequency. This source will represent the input signal to the circuit that needs to be amplified. c. Place capacitors at the input and the output of the circuit. The capacitor at the input will couple the AC input source to the circuit while isolating the DC bias source to the circuit. The capacitor at the output is intended to filter the AC signal while blocking the DC from the output node. d. Choose the values of the capacitances to guarantee that the capacitor will not interfere with the desired function of the circuit: amplifying a signal at 1kHz frequency. 1 Note that this circuit is the same circuit that was used in the previous assignment.

e. Place Oscilloscopes (see Figure 3 ) in the circuit schematic to measure the input and output voltage and compare them on a single display. Connect the B probes of the oscilloscope to the output signal and the channel A probe to the input source. The purpose of this step is to enable you to visualize the two signal on the same display. Adjust the parameters of the MOSFETs in the circuit to match exactly the specifications indicated above on f. Figure 1 . Figure 3 The Oscilloscope probe in MultiSim. Two probes represent two channels that can be used to visualize the input and out signals of the circuit. Your Deliverables 1. A PDF report file: MUST include at least a screenshot of the circuit schematic taken from MultiSim showing the full simulation results captured in one shot. 2. The circuit schematic file (.ms14) in MultiSim Your Grade

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Your mark will be evaluated based on how your solution PDF report address the following questions. 1. (5 points) Is the circuit shown in the PDF file (the screenshot) the same as your schematic file (.ms14)? 2. (5 points) Is your circuit complete in MultiSim complete? That is you have considered all required capacitors and DC biasing? 3. (10 points) Does the simulation validate that the circuit operates as an amplifier? Do you show on the PDF file the input and output signals and highlight that there is a voltage amplification? 4. (50 points) Does the voltage gain found from the MultiSim simulation match the voltage gain predicted from the analysis of the cascode circuit? See the solution in a previous assignment for the correct analysis result of the expected voltage gain. 5. (10 points) Can the grader (the TA) run the simulation of your schematic and obtain the same results shown in your PDF file? 6. (10 points) How well does your report communicate and articulate the following items a. Choices you made in the design. b. Difficulties you encountered to make the design act as a voltage amplifier c. Neatness and organization of the report.

The circuit

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