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analog-questions.md

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Analog Questions

A large portion of these questions are based off of the 18-220 Analog course from Carnegie Mellon. You can find the course notes for the class here.

Basics

  • How do you find the equivalent resistance of a circuit?
  • How do you find the equivalent capacitance of a circuit?
  • What a Thevenin and Norton equivalents, why do we use them?
  • How does a capacitor work?
  • How does an inductor work?

Transistors

  • A diode is made from a P and N type, explain how these two regions build a diode
  • How does a transistor work and why would you use one in a circuit?
  • What is the difference between a BJT and a MOSFET?
    • Why are MOSFETs more common in modern circuits?
  • Explain the 3 main parts of a MOSFET, the gate, source and drain.
  • What does it mean for a MOSFET to be on?
  • What do we say a MOSFET behaves like a VCCS (voltage-controlled current source) in saturation?
  • Design the following digital gates with MOSFETS:
    • NOT
    • OR
    • AND
    • XOR
  • Explain why a CMOS is advantageous to a MOSFET.
  • What are some applications of a MOSFET?

Power, Capacitance and Inductance

  • What is an RC circuit, and how do you solve it? What are some applications for it?
  • What is an RL circuit, and how do you solve it? What are some applications for it?
  • Why would you use an RC vs an RL circuit?
  • What is a full-wave rectifier?
  • What is a way to regulate current, why do we need to do this in certain circuits?
  • What is a way to regulate voltage, and why do we need to do this in certain circuits?
  • What is parasitic capacitance/inductance?
  • What is a transformer, and why are they useful?
    • What is an ideal transformer, and what are the assumptions for it?
    • What are non-ideal transformer properties?
  • Know the following switching power converters:
    • Buck Converter
    • Boost Converter
    • Flyback (Buck-Boost) Converter
  • Draw an LC oscillator -- how does it behave?
  • Draw an overdamped, critically damped, and underdamped time response for an RLC circuit.

Op-Amps

  • What are op-amps and why do we use them?
    • What is a transfer function in the context of an op-amp?
    • What is an ideal op-amp? Explain what it means for a non-ideal op-amp:
      • Nonzero input current
      • Finite input resistance
      • Finite output impedance
  • Draw an inverting and noninverting op-amp
  • Draw a differential op-amp
  • What are the assumptions for an ideal op-amp?

Signal Processing

  • How does RFID technology work?
    • Draw the circuit for an RFID scanner and tag
  • Draw a LPF (Low Pass Filter)
  • Draw a High Pass Filter
  • What is a Bode plot and what can it tell us?
    • Be able to take a transfer function and draw the Bode plot for it
  • What is the Shannon-Nyquist sampling theorem?
  • What is aliasing?

Designing circuits

  • Explain what parasitic capacitance is and how to handle it. Also understand it in the context of:
    • Where it might occur
    • Why we can't always increase clock speed
  • Design a circuit that allows an Arduino to control a 12V RGB LED strip