22-Elec-B5 Advanced Electronics, December 2015: worked solutions

Paper format. National Exams, December 2015 — 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. In schematics ground and chassis are common; op-amps are ideal and supplies are ±15 V unless stated otherwise. Candidates are urged to state any interpretation assumptions 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. 4 (diodes / shunt and series regulators), Ch. 7 (transistor amplifiers), Ch. 10 (frequency response, open-circuit time constants), Ch. 11 (feedback), Ch. 12 (output stages), Ch. 17 (tuned amplifiers).
B. Razavi, Fundamentals of Microelectronics, 2nd ed. — Ch. 8 (bias and small-signal models), Ch. 11 (frequency response, Miller's theorem), Ch. 12 (feedback topologies).
P. R. Gray, P. J. Hurst, S. H. Lewis & R. G. Meyer, Analysis and Design of Analog Integrated Circuits, 5th ed. — 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 figures were recovered. Every circuit on this paper carries data that exists only in the drawing (which branch a component sits in, which transistor terminal the source drives). Where a drawing is ambiguous or under-specified, the reading used is stated explicitly in a Check callout inside that question rather than being buried in the arithmetic.

22-Elec-B5 Advanced Electronics: December 2015