Description

Analog and digital electronic circuits based on bipolar and field effect transistors introduced in ELEC 252 (Electronics I) will be studied. The course is subdivided into two parts; the design and operation of amplifiers and the operation of common logic families. Particular attention is paid to the transient and frequency response of the circuits. The course also includes a study of feedback as applied to the design and analysis of electronic circuits. The laboratory work is design oriented and complements the lecture material.

Course Learning Outcomes (CLOs)

• Perform small-signal and large-signal analysis of differential amplifiers using both bipolar and MOSFET transistors. Calculate the differential gain, the common-mode gain, and the common-mode rejection ratio.
• Design current sources such as current mirrors, Wilson current sources, and Widlar current sources for biasing of amplifiers.
• Design multi-stage operational amplifiers using differential stages, common-emitter, and common collector stages.
• Draw the low-frequency, mid-band frequency, and high-frequency equivalent circuit of an amplifier. Calculate the lower and upper cut-off frequencies of an amplifier using analytic methods and approximation methods such as the short-circuit time constants approach, and the open-circuit time constants approach.
• Apply Miller's theorem to simplify the analysis of high-frequency electronic circuits.
• Design feedback amplifiers using any of the four feedback configurations (shunt/shunt, shunt/series, series/shunt, series/series). Calculate the open loop gain with feedback network loading, calculate the amplifier input and output resistances with loading.
• Determine whether an amplifier is stable or not using Bode plots.
• Design CMOS logic inverters and implement logic functions. Design logic gates for balanced rise and fall times using transistor scaling.

Credit Breakdown

Lecture: 3
Lab: 0.75
Tutorial: 0.5
Total: 4.25

Academic Unit Breakdown

Mathematics 0
Natural Sciences 0
Complementary Studies 0
Engineering Science 26
Engineering Design 25

Course Structure and Activities

Weeks 1and 2: Bipolar transistor differential amplifier basic operation; current equations and voltage equations; Differential gain, input resistance calculations; differential amplifier with emitter degeneration, common-mode gain.

Week 3: Offset voltages for non-ideal differential amplifiers due to resistance mismatch, transistor size mismatch, and current-gain mistmatch; current sources: basic current mirror, Widlar current mirror, Wilson current mirror

Week 4: Differential bipolar amplifier with active load; MOSFET differential amplifier current and voltage equations; MOSFET differential amplifier offset voltages due to resistance mismatch, size mismatch, and threshold voltage mismatch.

Week 5: MOSFET current mirrors; BiCMOS amplifiers: double cascode, differential amplifiers; Multi-stage amplifier (op amp) design detailed example.

Week 6: Transfer functions, Bode amplitude and phase plots; Short-circuit time constants approximation and open circuit time constants approximation; low-frequency, mid-band frequency and high-frequency circuit diagrams

Week 7: Common-emitter low frequency response; Common source, common-emitter high frequency response; Miller's Theorem

Week 8: Application of Miller's Theorem to the common-emitter high frequency equivalent circuit; Bipolar cascode amplifier; Common-base amplifier high frequency response

Week 9: Emitter-follower high-frequency response; Common collector-common emitter cascade amplifier; Differential amplifier high frequency response.

Week 10: The negative feedback equation and its meaning, two-port networks (z,y,h,g,s); The four amplifier feedback configurations; Series/Shunt voltage amplifiers

Week 11: Shunt/series current amplifier; Feedback amplifier stability, phase margin, frequency compensation; the CMOS logic inverter.

Week 12: Logic gate propagation delay, power consumption; Logic NAND and NOR gate implementation; Transistor sizing for arbitrary logic function circuit implementation.

Laboratory Studies:

The lectures are complemented with 5 laboratory experiments evenly spread throughout the term.

Tutorials:

Sample problems will be covered weekly to help with the understanding of the course material on the theoretical side. The hour-long tutorials are intended to be interactive directed at filling the gaps in the students' comprehension of the notions.

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