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MIT OCW 6.002 Annotations
! Annotated [Lecture 6 - Nonlinear Analysis|http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-002-circuits-and-electronics-spring-2007/video-lectures/embed06/] * Creates a device designed to send a signal over a garage door sensor * Unfortunately, the thing sounds terribly, because it transmits non-linearly. The waveform gets distorted. Demo starts around 38:15 [Lecture 7 - Incremental Analysis|http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-002-circuits-and-electronics-spring-2007/video-lectures/embed07/] * Fixes problem with Lecture 6's circuit. (Student solutions involved going digital, which is over-solving the problem in this case.) * Non-linear curves are linear in a small enough segment. So what you do is "squish" and "bump". ** Squish = Attenuate the signal so that it has a smaller range ** Bump = Raise the minimum signal so that the swing is higher up on the response curve of the component * Then you just amplify on the other end. Really neat. * AKA Small-signal method [Lecture 8 - Dependent sources and amplifiers|http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-002-circuits-and-electronics-spring-2007/video-lectures/embed08/] * Reminder about circuit analysis: ** Composition (Thevenin/Norton analysis) can often simplify ** Node method is always there when all else fails. The "Workhorse" * Amplification (aka Gain, Increase in signal strength, etc.), motivating examples: ** Greater noise immunity of stronger signal ** Cell phone, Antenna -> Low-Noise Amplifier ** Digital signal amplification (keeping it within tolerances * Voltage-Controlled Current Source (VCCS), CCCS, CCVS, VCVS; Examples: ** Independent Current Source: Current source + a resistor, simply V{sub}R{/sub} = IR (24:00) ** Dependent Current Source (VCCS): Voltage source + Current source, I = f(V) (25:00) *** + Simplified circuit drawing for VCCS (27:00) ** V{sub}0{/sub} = V{sub}S{/sub} - kR{sub}L{/sub}/2 * (V{sub}I{/sub} - 1){sup}2{/sup} ** (see 36:48) ** Very important equation for 6.002 ** == an amplifier ** Curve examination (45:00) ** Real-life departure from equation (49:00) [Lecture 9 - MOSFET amplifier large signal analysis - part 1|http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-002-circuits-and-electronics-spring-2007/video-lectures/embed09/] * Review ends at ~9:00 * VCCS, e.g. MOSFET [http://panoptic.com/rking/file/up/mosfet-vccs.png] ** V{sub}GS{/sub} < V{sub}T{/sub}, D-S = like open circuit ** V{sub}DS{/sub} < V{sub}GS{/sub} - V{sub}T{/sub} ** Resistive behavior, "SR Model" ** Digital *** Graphs @ 18:00, mentions, "A straight line is resistor-like behavior" ** V{sub}DS{/sub} >= V{sub}GS{/sub} - V{sub}T{/sub}, D-S = like current source: I{sub}D{/sub} = k/2 * (V{sub}GS{/sub}-V{sub}T{/sub}){sup}2{/sup} *** Shows curve for higher V{sub}GS{/sub}, MOSFET saturates *** (Youtube comment says: "For a MOSFET, the saturation region is the region where the FET acts like a current source. It is the opposite name used for a BJT transistor. In a BJT this same region is called the linear region.") * MOS Amp ([34:00|http://www.youtube.com/watch?v=Nijya-QJ45Y#t=34m], diagram complete near [37:30|http://www.youtube.com/watch?v=Nijya-QJ45Y#t=37m30s]) [Lecture 9 - MOSFET amplifier large signal analysis - part 2|http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-002-circuits-and-electronics-spring-2007/video-lectures/lecture-9-part-2/]
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Last changed: 2010/11/08 16:22