22-Elec-B5 Advanced Electronics, May 2016: worked solutions

Paper format. National Exams, May 2016 — 07-Elec-B5 Advanced Electronics. Three hours, CLOSED BOOK; any non-communicating calculator permitted. Answer all FIVE (5) questions; all questions are worth 20 marks each. Ground and chassis are common in every schematic; op-amps are ideal and supplies are ±15 V unless a question states otherwise. Candidates are urged to state any interpretation assumption inside their answer — this solution does so in the shaded Check callouts.

Reference texts.

A. S. Sedra & K. C. Smith, Microelectronic Circuits, 8th ed. — Ch. 7 (transistor amplifiers and the small-signal models), Ch. 8 (current mirrors and the cascode), Ch. 10 (frequency response, Miller's theorem, open-circuit time constants), Ch. 11 (feedback topologies and the effect on port resistances), Ch. 12 (class-A/B output stages), Ch. 17 (tuned amplifiers).
B. Razavi, Fundamentals of Microelectronics, 2nd ed. — Ch. 9 (cascode stages; Example 9.9, p. 405 is cited by name in Question 3), Ch. 11 (frequency response), Ch. 12 (feedback).
P. R. Gray, P. J. Hurst, S. H. Lewis & R. G. Meyer, Analysis and Design of Analog Integrated Circuits, 5th ed. — Ch. 3 (single-stage amplifiers), Ch. 7 (frequency response), Ch. 8 (feedback).
C. K. Alexander & M. N. O. Sadiku, Fundamentals of Electric Circuits, 7th ed. — Ch. 14 (resonance, bandwidth and quality factor).

Check — how the schematics below were obtained. Every question on this paper carries load-bearing data that exists only in the drawing (which branch a reactance sits in, which terminal a source drives, whether a bypass capacitor is present). Where the drawing is under-specified, the reading adopted is stated in a Check callout inside that question rather than being buried in the arithmetic.

22-Elec-B5 Advanced Electronics: May 2016