# ECE 205

## ECE 205 - Introduction to Electric and Electronic Circuits

### Spring 2021

### Official Description

### Subject Area

### Course Director

### Description

Basic principles of circuit analysis, transient analysis, AC steady-state analysis, introduction to semiconductor devices and fabrication, digital logic circuits, op-amps, and A/D and D/A conversion.

### Notes

ECE students may not receive credit for this course.

### Goals

This course is designed to give non-majors in engineering an introduction to electric circuits and microelectronic circuits.

### Topics

- Introduction: Charge, current, voltage, power, circuit elements, Ohm's law
- Kirchhoff's current and voltage laws, voltage and current divisions
- Node-voltage, mesh-current methods, superposition, and equivalence theorems
- RC and RL circuits, first-order and second-order network, step response, transient and steady state response for sinusoidal inputs
- Sinusoidal excitation and phasors
- AC steady-state analysis and AC steady-state power
- Frequency response, passive filters
- Diodes, diode circuit analysis
- BJT circuit analysis
- BJT logic circuits
- Propagation delay, rise and fall time, and noise margin
- Op-amps and applications

### Detailed Description and Outline

This course is designed to give non-majors in engineering an introduction to electric circuits, semiconductor devices, and microelectronic circuits.

Topics:

- Introduction: Charge, current, voltage, power, circuit elements, Ohm's law
- Kirchhoff's current and voltage laws, voltage and current divisions
- Node-voltage, mesh-current methods, superposition, and equivalence theorems
- RC and RL circuits, time domain analysis, step response, response to sinusoidal inputs
- RLC circuits, time domain analysis, step response, response to sinusoidal inputs
- Sinusoidal excitation and phasors
- AC steady-state analysis and AC steady-state power
- Frequency response, passive filters
- Op-Amp - inverting and non-inverting Active Filter
- Op-Amp- Integrator, Current Source Comparator
- P-N Junction Diodes
- Introduction to BJTs
- Binary Logic and Logic Gates
- Logic Gates Using BJTs

ECE students may not receive credit for this course.

### Topical Prerequisites

- Physics in electricity and magnetism
- Differential and integral calculus
- Linear, ordinary differential equations

### Texts

*Analog Signals and Systems, Erhan Kudeki and David C. Munson Jr.*

### ABET Category

Engineering Science: 100%

### Course Goals

ECE 205 is an introductory course on circuit analysis and electronics for non-majors in engineering. The goals are to impart the fundamental principles of electric circuits and electronic circuits that constitute the foundation for preparing a non-major to take follow-on courses involving electric and electronic circuits.

### Instructional Objectives

**At the end of week 3, students should be able to do the following:**

- Calculate the currents and voltages in resistive circuits using Ohm’s law, KCL, KVL, reduction of series and parallel resistances, and voltage and current divisions (1)
- Find the node voltages in resistive circuits containing current sources and voltage sources using nodal analysis (1)
- Find the mesh currents and branch currents in resistive circuits containing voltage sources and current sources using mesh analysis (1)
- Analyze resistive circuits containing multiple sources by using superposition (1)
- Apply Thevenin’s and Norton’s theorems to simplify a resistive circuit by finding the Thevenin or Norton equivalent of a two-terminal network (1)

**At the end of week 6, students should be able to do the following:**

- Calculate the currents and voltages in a circuit containing diodes using the simple constant-voltage model for the diode(s) (1)
- Determine the modes of operation of the BJTs and the on/off condition of the diodes, and calculate the voltages and currents in various simple BJT/diode circuits for given input voltages (1)
- Determine the modes of operation of the BJT and calculate the voltages and currents in a BJT dc circuit, and find the power dissipated by the BJT (1)
- Draw truth tables for basic logic operations, apply boolean algebra principles, and implement gate level logic circuits (1)

**At the end of week 9, students should be able to do the following:**

- Determine the initial conditions of circuits containing capacitors and inductors using capacitor rules and inductor rules (1)
- Calculate the currents and voltages of a first-order network containing a switch, and find the step response of a first-order network containing a step source (1)
- Calculate the currents and voltages of a first-order network containing a switch, and find the transient of a first-order network containing to a sinusoidal forcing function. (1)
- Calculate the currents and voltages of a second-order network containing a switch, and find the transient response of a second-order network containing a step function. (1)

**At the end of week 12, students should be able to do the following:**

- Manipulate complex numbers and understand their meaning (1)
- Find the phasor voltage (current) for a given sinusoidal voltage (current), and find the sinusoidal voltage (current) for given phasor voltage (current) and frequency (1)
- Find the impedances of resistors, capacitors, and inductors for a given frequency ()
- Analyze a phasor circuit using Ohm’s law, KCL, KVL, reduction of series and parallel impedances, and voltage and current divisions (1) Calculate the phasor voltages and currents in a phasor circuit by applying nodal analysis (1)
- Find the phasor voltages and currents in a phasor circuit containing multiple sources using superposition (1)
- Analyze magnetic circuits and circuits containing transformers. (1)

**At the end of week 14, students should be able to do the following:**

- Derive and sketch the frequency response of a linear circuit or system. (1)
- Analyze circuits containing Op-amps (ideal)– Differentiators, Integrators, active filters.(1)

**Labs**

**Battery, internal resistance, and multimeter**

At the end of week 4, students should be able to do the following:

- Measure the voltage of a battery under no-load and loaded conditions using multimeter and basic breadboard circuit (1,3,5,6)
- Use measurements to estimate internal resistance of battery (1,3,5,6)
- Relate internal resistance of battery to change level of battery (1,3,5,6)

**Diodes, photoresistor, photodiode**

At the end of week 6, students should be able to do the following:

- Build and document a light measuring circuit using a photoresistor (1,3,5,6)
- Build and document a similar circuit using a photodiode and a transistor (1,3,5,6)
- Measure the response of both circuits on the oscilloscope (1,3,5,6)
- Explain the similarities and differences between each circuit (1,3,5,6)

**555 Timer and Oscilloscope**

At the end of week 8, students should be able to do the following:

- Build and document an astable-multivibrator circuit using a 555, capacitors, and resistors (1,3,5,6)
- Measure the response of the circuit using the oscilloscope (1,3,5,6)
- Predict and measure the response of the circuit to changes in the resistors (1,3,5,6)

**Filters and function generator**

At the end of week 10, students should be able to do the following:

- Predict, build, and measure (using the function generator and oscilloscope) the magnitude response of a R-C high pass filter (1,3,5,6)
- Predict, build, and measure (using the function generator and oscilloscope) the magnitude response of a R-C low pass filter (1,3,5,6)
- Predict and measure the effect of loading on each filter (1,3,5,6)

**Op-amps **

At the end of week 12, students should be able to do the following:

- Build and document an op-amp amplifier (1,3,5,6)
- Use oscilloscope to measure amplified audio-range signal from the function generator (1,3,5,6)
- Hear, measure (on oscilloscope), and explain the effect of clipping due to excessive gain or too-low supply voltage (1,3,5,6)

**Switch mode power supply and LCR bridge**

At the end of week 14, students should be able to do the following:

- Predict, wind, and measure the inductance of inductor using LCR bridge (1,3,5,6)
- Build and document a boost converter circuit to light blue LED from 1.5 V battery using transistors, capacitors, inductors, and resistors (1,3,5,6)
- Use oscilloscope to measure switching waveform and see effect of increasing or reducing the inductance (1,3,5,6)