ECE/CS 5720/6720 Super Trivia Game Shoccharles/ece5720/Lectures/Gameshow.pdfSuper Trivia Game Show...

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ECE/CS 5720/6720 ECE/CS 5720/6720 Super Trivia Game Show Super Trivia Game Show Hosted by Prof. Cameron Charles Hosted by Prof. Cameron Charles March 4, 2008

Transcript of ECE/CS 5720/6720 Super Trivia Game Shoccharles/ece5720/Lectures/Gameshow.pdfSuper Trivia Game Show...

Page 1: ECE/CS 5720/6720 Super Trivia Game Shoccharles/ece5720/Lectures/Gameshow.pdfSuper Trivia Game Show Hosted by Prof. Cameron Charles March 4, 2008 March 4, 2008 Cameron Charles Slide

ECE/CS 5720/6720ECE/CS 5720/6720Super Trivia Game ShowSuper Trivia Game Show

Hosted by Prof. Cameron CharlesHosted by Prof. Cameron Charles

March 4, 2008

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Question Categories

• Devices• Layout• Building Blocks• Opamps• Important Information

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Category: Devices

Q: How does the junction capacitance of a PN junction change with increasing reverse bias?

A: It decreases.

Q: Why?

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Category: Devices

Q: If VT = 0.5 V, what operating region is this NMOS device in?

A: Triode.

Q: Which terminal is the source on this NMOS device?

A: Terminal 1.

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Category: Pop Culture

Q: How does one say “Hello” in Kazahki?

A: “Jagshemash!”

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Category: Devices

Q: If VT = 0.5 V, what operating region is this PMOS device in?

A: Saturation.

Q: Which terminal is the source on this PMOS device?

A: Terminal 2.

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Category: Devices

Q: What large signal device parameter is influenced by the Body Effect?

A: The threshold voltage.

Q: Does it go up or down?

A: Up.

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Category: Pop Culture

Q: Who is this?

A: K-Fed.

Q: What did his moniker change to after Britney dumped him?

A: Fed-ex.

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Category: Devices

Q: Explain the mechanism behind Channel Length Modulation.

A: The channel gets shorter, increasing W/L and increasing ID.

Q: What would rds be for a transistor with no Channel Length Modulation?

A: Infinite.

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Category: Devices

Q: Which is the largest among the different small signal device capacitances?

A: CGS (the gate-source capacitance).

Q: In which operating region is this capacitance at a maximum?

A: Saturation.

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Category: Politics

Q: Which of these men is the current Prime Minister of Canada?

A: On the right.

Q: What is his name?

A: Stephen Harper.

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Category: Layout

Q: What does λ represent in our design rules?

A: 2 λ = minimum gate length.

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Category: Layout

Q: What does DRC stand for?

A: Design Rule Check.

Q: What does LVS stand for?

A: Layout Versus Schematic.

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Category: Personal Life

Q: What did you do last weekend?

A: Studied for the 5720/6720 midterm.

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Category: Building Blocks

Q: What is the output resistance of a standard current mirror?

A: rds.

Q: How about a cascode current mirror?

A: gm(rds2).

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Category: Building Blocks

Q: In what situation would you use a common-source amplifier?

A: When you want high gain and can tolerate a high output impedance.

Q: How about a common-drain amplifier?

A: When you need a low output impedance.

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Category: Grammer and Syntax

Q: Which of these phrases uses correct grammer:• “I’m doing well.”• “I’m doing good.”

A: The first one.

Q: Why?

A: “well” is an adverb, “good” is an adjective.

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Category: Building Blocks

Q: What is the approximate input impedance of a common-gate amplifier?

A: 1/gm.

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Category: Building Blocks

Q: How can we increase the linear range of a differential pair?

A: Reduce the input devices’ gm.

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Category: Cycling

Q: Who holds the record for most Tour de France victories?

A: Lance Armstrong.

Q: Was he correct in dumping Sheryl Crow?

A: No, that was a huge blunder.

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Category: Building Blocks

Q: What is the definition of Common Mode Rejection Ratio?

A: Differential gain divided by common-mode gain.

Q: Would we like it to be high or low?

A: High.

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Category: Opamps

Q: In what situations do we need the third stage (output buffer) in the opampdiscussed in class?

A: When driving a low impedance load.

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Category: Pop Culture

Q: Who is this guy?

A: McLovin! (from SuperBad)

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Category: Opamps

Q: How does the Miller Effect help us when compensating an opamp?

A: It allows us to use a smaller physical capacitor and also performs “pole splitting”.

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Category: Opamps

Q: How does systematic offset voltage arise in an opamp?

A: When the transistors in the second stage are biased to have different drain currents.

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Category: Feats of Strength

Q: Which of these canyons is the hardest to ride up on a bike:• Emigration• Big Cottonwood• Little Cottonwood• Millcreek

A: Little Cottonwood Canyon: 9.6 miles and 3300 vertical feet of suffering!

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Category: Opamps

Q: What is the slew rate of an opamp?

A: The maximum rate at which the output voltage can change.

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Category: Opamps

Q: Which zeros are worse for stability: RHP or LHP, and why?

A: RHP, since they reduce both the gain and the phase.

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Category: Politics

Q: Who is the current President of France?

A: Nicolas Sarkozy.

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Category: Opamps

Q: Why do we include RC in our opampcompensation?

A: To move the RHP zero into the LHP and increase the phase margin.

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Category: Opamps

Q: What are corner simulations, and when would you run them?

A: Simulations to make sure that your design will work across all transistor speeds, run them when finalizing your design before fabrication.

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Category: Personal Life

Q: What is the best part of your day on Tuesdays and Thursdays?

A: Attending Dr. Charles’ scintillating lectures.

Q: What the heck does “scintillating” mean?

A: to sparkle intellectually; brilliant and witty