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22-Elec-B5 Advanced Electronics: December 2017

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

  1. Question 1 Bipolar Cascode Current Source — Output Resistance and Output Compliance
  2. Question 2 Op-Amp with a Grounded-Gate MOSFET in the Feedback Path — Transfer Law and Function
  3. Question 3 Common-Emitter Amplifier — Sizing the Three Capacitors for a 100 Hz Lower Corner
  4. Question 4 Common-Source Amplifier — Mid-Band Gain With and Without the Source Bypass, and the New $f_H$
  5. Question 5 Two-Stage Series–Shunt Feedback Amplifier — Feedback Factor, Loop Gain and Closed-Loop Gain

Start with Question 1 →

Paper format. National Exams December 2017, 16-Elec-B5 Advanced Electronics — 3 hours, CLOSED BOOK, one approved Casio or Sharp calculator. Five questions, all to be answered, 20 marks each (100 marks total). In schematics ground and chassis are common; op-amps are ideal and supply rails are ±15 V unless stated otherwise. Candidates are instructed to state any interpretive assumption inside the answer, and to provide block diagrams and schematics wherever an essay-format response needs them.

Reference texts. A. S. Sedra and K. C. Smith, Microelectronic Circuits, 8th ed. (Ch. 7 transistor amplifiers, Ch. 8 cascodes and current mirrors, Ch. 10 frequency response, Ch. 11 feedback); B. Razavi, Fundamentals of Microelectronics, 2nd ed. (Ch. 9 cascode stages and current mirrors) and Design of Analog CMOS Integrated Circuits, 2nd ed. (Ch. 6 frequency response); R. C. Jaeger and T. N. Blalock, Microelectronic Circuit Design, 5th ed. (Ch. 17 low-frequency response); P. R. Gray, P. J. Hurst, S. H. Lewis and R. G. Meyer, Analysis and Design of Analog Integrated Circuits, 5th ed. (Ch. 8 feedback).

How each answer is laid out. Every calculation question states its data, the quantity sought, the circuit as drawn on the paper, a one-line strategy, then numbered steps with the governing relation, the substitution and the intermediate result. Boxed values are the answers a marker looks for, and each question closes with a results table and a concept note.