ELEC376 Electronic Devices and Systems Assignment

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Reference no: EM132392083 , Length: word count:1000

ELEC376/676 Electronic Devices and Systems Assignment - Binesh Puthen Veettil, School of Engineering, Macquarie University, Australia

Module-3 Laboratory worksheet

INTRODUCTION - Lab module-3 is designed to build on your understanding of mixers. It concerns with the simulation, implementation and analysis of frequency doubler and a mixer. This lab module will run for 2 weeks (in two parts). For simulations, you will use a SPICE simulation tool called LTspice. The circuits will be implemented on a breadboard using BJTs available in the lab. As you are now more familiar with the concepts and implementation, there are lesser number of steps and instructions, that means more freedom to you on how to approach the lab problem.

PART 1 - MIXER SIMULATION

PRE-LAB1 -

A1. Write down the expanded equation for the square wave (in blue) shown in Figure-1 up to 5 terms.

A2. If the square wave in the above equation was passed through a rectifying diode (assume an ideal diode with no nonlinearity) what is the new expanded equation for the rectified square wave?

WORK MODULE1

(a1) Wire up the circuit given in Error! Reference source not found. in LTspice. This is a mixer circuit. Give the local oscillator signal (LO) of 5KHz pulses with 50% duty cycle and the RF signal of 7KHz sine wave.

Simple mixer

(b1) The output is taken at the collector of Q1. Observe the output signal in the time domain and find out the various frequency components in the output using FFT.

(c1) Focus on the first five frequency components in FFT and explain where each of them may originate from.

Advanced mixer

(d1) Implement the circuit shown in figure3. Give LO = 50KHz, 1V peak and RF = 5KHz 1V peak.

(e1) Identify the current source, differential pair and buffer in the circuit.

(f1) Check for the mixed signals of the first order.

For extra marks

(g1) Imagine you have an input signal of 5KHz as before and you need to double that frequency, modify the circuit so that you have a frequency doubler.

PART 2 - MIXER IMPLEMENATION

PRE-LAB2

List the advantages and disadvantages of an unbalanced, single balanced and a double balanced mixer.

What kind of balanced circuit is the mixer in figure-2?

WORK MODULE2

Simple mixer implementation

(a2) Implement the circuit shown in Figure-2 on a breadboard using BJT transistors.

(b2) Connect the LO and RF signals using a frequency generator and verify the outputs using an oscilloscope and a frequency analyser.

(c2) Comment on the leakage of signals.

(d2) Check the frequency doubling capacity of your circuit.

(e2) Increase the frequency to a very high frequency and comment on the leakage of the LO at the output. Tip: Use the spectrum analyser to check the relative strengths of frequencies.

For extra marks

(f2) Going back to the question in (a2), implement an RC circuit at the output to extract the LO-RF frequency (the difference frequency). Comment on its performance.

TIME MANAGEMENT

This worksheet is for two weeks. You will investigate working of a mixer through simulation as well as circuit building. You will need to write a report on your findings.

Attachment:- Electronic Devices and Systems Assignment Files.rar

Reference no: EM132392083

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len2392083

10/30/2019 4:45:41 AM

Need to write a report. I am attaching all the documents required and the template for my report. Strictly follow the template and format given in the IEEE style lab report template. Lab Report is based on the file LabworksheetModule3 Your report should be unique and your own work. Write a concise, good quality report with relevant results and appropriate technical explanations. The length of the report is limited to 3 pages. All figures should be clear and relevant. Use appropriate figure numbers and figure captions. Use appropriate table numbers and table captions for all tables. Use references wherever necessary.

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