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
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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
March 4, 2008 Cameron Charles Slide 2
Question Categories
• Devices• Layout• Building Blocks• Opamps• Important Information
March 4, 2008 Cameron Charles Slide 3
Category: Devices
Q: How does the junction capacitance of a PN junction change with increasing reverse bias?
A: It decreases.
Q: Why?
March 4, 2008 Cameron Charles Slide 4
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.
March 4, 2008 Cameron Charles Slide 5
Category: Pop Culture
Q: How does one say “Hello” in Kazahki?
A: “Jagshemash!”
March 4, 2008 Cameron Charles Slide 6
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.
March 4, 2008 Cameron Charles Slide 7
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.
March 4, 2008 Cameron Charles Slide 8
Category: Pop Culture
Q: Who is this?
A: K-Fed.
Q: What did his moniker change to after Britney dumped him?
A: Fed-ex.
March 4, 2008 Cameron Charles Slide 9
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.
March 4, 2008 Cameron Charles Slide 10
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.
March 4, 2008 Cameron Charles Slide 11
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.
March 4, 2008 Cameron Charles Slide 12
Category: Layout
Q: What does λ represent in our design rules?
A: 2 λ = minimum gate length.
March 4, 2008 Cameron Charles Slide 13
Category: Layout
Q: What does DRC stand for?
A: Design Rule Check.
Q: What does LVS stand for?
A: Layout Versus Schematic.
March 4, 2008 Cameron Charles Slide 14
Category: Personal Life
Q: What did you do last weekend?
A: Studied for the 5720/6720 midterm.
March 4, 2008 Cameron Charles Slide 15
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).
March 4, 2008 Cameron Charles Slide 16
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.
March 4, 2008 Cameron Charles Slide 17
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.
March 4, 2008 Cameron Charles Slide 18
Category: Building Blocks
Q: What is the approximate input impedance of a common-gate amplifier?
A: 1/gm.
March 4, 2008 Cameron Charles Slide 19
Category: Building Blocks
Q: How can we increase the linear range of a differential pair?
A: Reduce the input devices’ gm.
March 4, 2008 Cameron Charles Slide 20
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.
March 4, 2008 Cameron Charles Slide 21
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.
March 4, 2008 Cameron Charles Slide 22
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.
March 4, 2008 Cameron Charles Slide 23
Category: Pop Culture
Q: Who is this guy?
A: McLovin! (from SuperBad)
March 4, 2008 Cameron Charles Slide 24
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”.
March 4, 2008 Cameron Charles Slide 25
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.
March 4, 2008 Cameron Charles Slide 26
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!
March 4, 2008 Cameron Charles Slide 27
Category: Opamps
Q: What is the slew rate of an opamp?
A: The maximum rate at which the output voltage can change.
March 4, 2008 Cameron Charles Slide 28
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.
March 4, 2008 Cameron Charles Slide 29
Category: Politics
Q: Who is the current President of France?
A: Nicolas Sarkozy.
March 4, 2008 Cameron Charles Slide 30
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.
March 4, 2008 Cameron Charles Slide 31
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.
March 4, 2008 Cameron Charles Slide 32
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
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