ENGN2218 Electrical Systems & Design builds directly on ENGN1218 Introduction to Electrical Systems by developing the students' understanding of the principles and operation of advanced electronic circuits and devices (bipolar junction transistor, operational amplifier, filters, digital logic gates, ADC and DAC, 555 Timer and Instrumentation amplifiers). It also emphasizes the importance of modelling the behaviour of complex electronic circuits and devices using systematic mathematical techniques. PSPICE is used extensively in the analysis and design. Specific topics include:

• Bipolar Junction Transistors: Basic BJT concepts and circuit models, BJT Amplifiers (bias circuits, small-signal and large-signal equivalent circuits), BJT Common Emitter and Common Collector amplifiers, Cascaded BJT amplifiers.
• Op-amp: Op-amp characteristics, closed loop and open loop gains, Schmitt trigger.
• Steady State Sinusoidal Analysis: complex numbers, phasors, impedances, complex power.
• Op-amp Filters: Transfer functions, Bode Plots, First order active filters (low-pass and high pass).
• Digital Electronics: Number systems, Boolean algebra, Logic gates, Combinational logic circuits, Karnaugh maps, Combinational logic circuit design.
• Special topics: Analog to Digital Converters (ADC), Digital to Analog Converters (DAC), 555 Timer, Instrumentation Amplifiers.

Learning Outcomes

Upon successful completion, students will have the knowledge and skills to:

1. Explain and use engineering abstractions and simple mathematical models to represent non-linear and active circuit elements (such as BJTs and op-amps).
2. Apply circuit analysis techniques in time and phasor domains (such as node-voltage method, mesh current method, Thevenin equivalent circuits, Phasors and complex impedances, Transfer functions, Bode plots) to solve electronic circuits.
3. Analyse and design analogue electronic circuits using BJT and op-amp amplifiers, opamp filters and op-amp comparator circuits.
4. Design combinational logic circuits using digital logic gates and timer circuits using the 555 Timer.
5. Explain in simple terms the working of electronic components and circuits and justify the practical significance of the real world analogue and digital electronic systems considered in the course.
6. Read data sheets and circuit diagrams and recognize building blocks such as power supply, amplifiers, comparators, filters, logic gates, timers and ADC/DAC. Assemble circuits and take measurement of circuit variables using appropriate lab tools (such as oscilloscope, function generator, digital multi-meter, power supply and MOKUs). Simulate circuits using a variety of simulation packages (such as PSPICE, LTSpice, Digitalworks and relevant smartphone app). Compare measurements with simulations.
7. Collaborate effectively with responsibility for personal and group laboratory outputs.