Study Guide for Quiz 2

The second quiz will consist of problems based on material from the lectures and HWs, similar to the first quiz. The material covers topics in lecture from Week 3 up to Week 5. This quiz will also be on-line, open-book, and open-notes.

Topics covered and specific items to review (see Webster 4^th Ed. and the lecture notes):

Active circuits, amplifiers, and signal processing [Ch. 3]:

1. Power supplies: you do not need to memorize the circuit diagram, only be familiar with the components and their functions
2. Op-amp analysis [Sec. 3.1-3.4]: ideal op-amp analysis, use KCL. Non-ideal characteristics
3. Filters [Sec. 3.10]: op-amp circuits, using impedances instead of resistances
4. Input and output impedance [Sec. 3.14]: calculate each for a given circuit. See the Quiz 1 material, but now including op-amps
5. Comparators [Sec. 3.5], timers [Sec. 3.16] and digital circuits: only components/devices given in lecture. This includes the 2 modes of the 555 circuit, you do not need to memorize the wiring configurations or timing equations, but should know the function of each (monostable and astable) and how they are used, and what the output would look like, and if you saw the circuit with components, know which external components are used in the timing equations

Origin of biopotentials [Ch. 4]:

6. Electrical activitity of excitable cells [Sec. 4.1]: Cell membranes, ion transport, and permeability of ions through membranes. Nernst potential and Goldman-Hodgkin-Katz resting potential (you do not need memorize the equations or constants in the equations, just know how to use it). Action potentials, and myelinated axons.
7. Volume conduction [Sec. 4.2]: Current monopoles and dipoles (no need to remember the equations).
8. Electrocardiogram [Sec. 4.6]: P wave, QRS complex, T wave. Atrial and ventricular depolarization and repolarization.
9. Other biopotentials [Sec. 4.4, 4.5, 4.7, 4.8]: EEG, ECoG, ENG, EMG, ERG, EOG: fundamentals of where these potentials originate and where/how they are measured.

Biopotential electrodes [Ch. 5]:

10. The electrode-electrolyte interface [Sec. 5.1] and polarization [Sec. 5.2]: Half-cell potential, and total (polarization) potential with the different overpotentials (no need to memorize the equation but know how to use it).
11. Polarizable and non-polarizable electrodes [Sec. 5.3]: The Ag/AgCl non-polarizable electrode.
12. Electrode behavior and circuit models [Sec. 5.4]: equivalent circuit of the electrode, and its DC and AC operation.
13. The electrode-skin interface [Sec. 5.5]: no need to memorize the equivalent circuit diagram but know how to use and analyze its behavior for different values of the parameters.

If you are asked to 'sketch' the value of a voltage or current, this would mean make a graph with axis scales, typically as a function of time (unless directed otherwise). If the questions just says to "find" a voltage or current or other quantity, that would mean to derive an equation or numerical value for the variable in question.