Abbreviations
TE = thermal equilibrium
MOS = metal-on-silicon
MOSFET = metal-oxide-semiconductor field-effect transistor
BJT = bipolar junction transistor
CMOS = complementary metal-oxide-semiconductor
CS = common source
OCTC = open circuit time constant
LEC # | TOPICS | KEY DATES |
---|---|---|
1 | Introduction to semiconductors, doping, generation/recombination, TE carrier concentrations. Carrier dynamics and transport: drift. | Problem set 1 out |
2 | Excess populations and minimum carrier lifetime, photoconductivity. Non-uniform concentrations and diffusion. Fick’s first and second laws. | |
3 | The five basic equations. Device structures in TE: carriers and electrostatic potential; the 60 mV rule. Poisson’s equation (PE). |
Problem set 1 due Problem set 2 out |
4 | P-n junctions in thermal equilibrium and under reverse bias, the depletion approximation (DA), comparison to PE solution. | |
5 | Review reverse biased junctions. Consider forward bias and the special case of minority carrier injection into quasineutral regions. |
Problem set 2 due Problem set 3 out |
6 | Forward biased p-n junctions: carrier injection, i-v characteristics (ideal and real; forward and reverse). Engineering carrier injection. | |
7 | Bipolar junction transistors: two coupled diodes, terminal characteristics, regions of operation |
Problem set 3 due Problem set 4 out |
8 | Solar cells and LEDs (light emitting diodes). | Problem set 4 due |
Exam 1 (Lec #1-7) | Problem set 5 out | |
9 | MOS capacitors: the DA applied to two-terminal MOS capacitor accumulation, depletion, and inversion; V_{FB}, V_{T}, Q_{A}, and Q_{N} | |
10 | The three-terminal MOS capacitor. MOSFETs: begin gradual channel approximation (GCA) using DA and ignoring subthreshold carriers. |
Problem set 5 due Problem set 6 out |
11 | Complete GC/DA model for i_{DS}: saturation, channel length modulation. Output characteristics; regions of operation. | |
12 | Subthreshold operation of MOSFETs. Development of model; compare to full numerical solution. Compare to/contrast with BJTs. |
Problem set 6 due Problem set 7 out |
13 | Linear equivalent circuits for MOSFETs and BJTs at low and high frequency; transconductance of subthreshold MOSFETs. | |
14 | Logic inverter basics. Introduction to CMOS: transfer characteristics, noise margins, optimal device sizing. |
Problem set 7 due Problem set 8 out |
15 | CMOS analysis, continued: switching delays, power dissipation, speed/power trade-offs. | Problem set 8 due |
16 | CMOS analysis, continued: subthreshold leakage, scaling rules, and where it is all going. | |
Exam 2 (Lec #9-15) | Problem set 9 out | |
17 | Linear amplifier basics: performance metrics, current source biasing, current mirrors, mid-band range, two-port representation. | |
18 | Single-transistor building block stages: common-source, common-gate, and common-drain (follower) stages; characteristics and features. |
Problem set 9 due Problem set 10 out |
19 | Differential amplifiers: large signal transfer characteristics; small signal analysis using common- and difference-mode inputs. | |
20 | Multi-stage amplifiers I: cascading diff stages; current source biasing; output stages. |
Problem set 10 due Design problem out |
21 | Multi-stage amplifiers II: active loads, biasing for maximum gain, input and output swings. | |
22 | Multi-stage amplifiers III: examples, stage selection, speciality stages, looking at a commercial op-amp schematic. Begin frequency response. | |
23 | Frequency response of CS amplifiers, the Miller effect. Intrinsic frequency limitations of MOSFETs. Biasing to maximize speed, power trade-off. | Design problem due |
24 | OCTC method for estimating frequency response. Subthreshold amplifiers for ultra-lower power electronics, frequency performance. | |
25 | MOS imagers. Semester wrap-up; life after 6.012. |