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98-Comp-A1: December 2017

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

  1. Question 1 Two-Level Soft Limiter (Antiparallel Diode-Battery Branches)
  2. Question 2 MOSFET Common-Gate Amplifier (Current-Source Biased)
  3. Question 3 Active Low-Pass Filter with Input Offset
  4. Question 4 BJT Common-Emitter Amplifier with an Ideal Current-Source Emitter
  5. Question 5 RC-Ladder Phase-Shift Oscillator (Virtual-Ground Feedback)
  6. Question 6 CMOS 3-Input NOR/NAND Gate Sizing
  7. Question 7 Charge-Redistribution Successive-Approximation ADC

Start with Question 1 →

98-Comp-A1, Electronics — National Exams, December 2017. Open-book, 3 hours; the paper's own NOTES/marking-scheme block states "FIVE (5) questions constitute a complete exam paper: the first 5 questions as they appear in the answer book will be marked," but all seven 20-mark questions are answered below as a complete study resource (per the standing "answer all M" rule). Unless stated otherwise, diode drops $V_D=0.7\text{V}$.

Reference texts: Sedra & Smith, Microelectronic Circuits (diode limiters, MOSFET common-gate amplifiers, active-RC matched-feedback filters and offset, BJT common-emitter amplifiers with current-source biasing, RC-ladder sinusoidal oscillators, CMOS static logic sizing, charge-redistribution SAR ADCs) — the single reference text covering every question on this paper.