Electronics II

Multistage amplifiers and interstage coupling, current mirrors and active loads, the differential pair and common-mode rejection, op amp internal design with gain, bandwidth and slew rate, high-frequency response with the Miller effect and open-circuit time constants, cascodes and wideband techniques, negative feedback and its four topologies, stability with phase margin and frequency compensation, RC, LC and crystal oscillators, class A, B and AB output stages with thermal design, class D switching amplifiers, and a capstone that designs a 4 W loudspeaker amplifier, with runnable Python calculations throughout.

ELE-340 Year 3 3 credits 12 lessons · 5 h 5 min ▶ Video lessons coming soon

Offered by HSM University · Electrical Engineering

This is the American version of this course. See the Canadian version.

What you'll learn

Analyze multistage amplifiers with two-port stage models, including interstage loading, and choose capacitor, direct, transformer or optical coupling with appropriate level shifting.
Design BJT and MOSFET current mirrors, Widlar sources and improved mirrors, calculate their current errors and output resistances, and use them as active loads.
Analyze differential pairs for large and small signals, calculate differential gain, common-mode gain, CMRR, offset and bias current, and apply them to hum rejection on long cables.
Explain the internal architecture of op amps, calculate open-loop gain, unity-gain frequency and slew rate from circuit parameters, and relate them to datasheet specifications.
Estimate the high-frequency response of transistor amplifiers with the hybrid-π model, f_T, Miller's theorem, exact two-pole analysis and open-circuit time constants.
Apply cascodes and other wideband techniques, account for bandwidth shrinkage in cascaded stages, and relate bandwidth to rise time.
Apply the feedback equation to quantify desensitivity, bandwidth extension and distortion reduction, and classify and analyze the four feedback topologies.
Determine the stability of feedback amplifiers from loop-gain Bode plots, relate phase margin to overshoot and peaking, and apply dominant-pole, Miller, lead and isolation compensation.
Design RC phase-shift, Wien-bridge, LC and crystal oscillators and relaxation oscillators, including amplitude control and frequency measurement for inductive loop detectors.
Design class A, B and AB output stages, calculate efficiency and worst-case dissipation, bias against crossover distortion and thermal runaway, and size heat sinks.
Explain class D amplification with pulse-width modulation, design the output filter, estimate losses, and evaluate dead time, feedback and interference against class AB alternatives.
Carry a power amplifier design from specification through stage design, loop and distortion verification, thermal and protection design, bench testing and design review.

Course content

12 lessons · 5 h 5 min total · final exam

1 Multistage amplifiers and coupling 25 min · quiz
2 Current mirrors and active loads 24 min · quiz
3 The differential pair 24 min · quiz
4 Operational amplifier internal design 25 min · quiz
5 High-frequency response and the Miller effect 24 min · quiz
6 Cascodes and wideband techniques 23 min · quiz
7 Negative feedback and the four topologies 26 min · quiz
8 Stability and frequency compensation 26 min · quiz
9 Oscillators 28 min · quiz
10 Output stages and thermal design 25 min · quiz
11 Class D and switching amplifiers 25 min · quiz
12 Amplifier design project: the APS-2 speaker driver 30 min · quiz
E Final exam 20 questions

Requirements

ELE-240 Electronics I

Recommended background. You can start any course at any time.

Description

Part of the Engineering stream, typically taken in year 3.