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Lecture K

Lecture K. No lectures on Thursdays anymore! Yeah! Mid-term in ~3 weeks. Covers all materials we covered up that date (lectures and labs) Start thinking about your final projects! (Proposal due in 5 weeks). Our Trusty LF356 contains about a dozen transistors (BJTs and FETs).

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Lecture K

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  1. Lecture K • No lectures on Thursdays anymore! Yeah! • Mid-term in ~3 weeks. Covers all materials we covered up that date (lectures and labs) • Start thinking about your final projects! (Proposal due in 5 weeks)

  2. Our Trusty LF356 contains about a dozen transistors (BJTs and FETs)

  3. Modern CPUs and GPUs contain well over 1 billion transistors. Some memory chips even several 10 billions (mostly FETs)! (Sorry. No circuit diagram for this one…)

  4. Moore’s Law Curve shows ‘Moore’s Law’: Transistor count doubling every two years

  5. Analogy of current in n and p-doped semiconductors Electrons carry the current. n-doped Traffic jam! Current cannot flow. un-doped (“intrinsic”) Energy “Holes” carry the current. p-doped Momentum

  6. L1 Based on the VCE vs. IC plot on the board, what is the current gain hfe? • 1 • 10 • 100 • 200 • 1000

  7. L2 What is Vout for an emitter follower? IB RE Vin 10 V - 0.6 V Vin + 0.6 V Vin – 0.6 V

  8. L5 What is Vout for a common emitter amplifier? Vcc- hfeRC IB Vin - hfeRC IB Vcc- RC IB Vin - RC IB I donno.

  9. For the (properly biased) input voltage signal shown below, which of the following choices best represents the output voltage signal for the circuit at right?

  10. Vin is a 1 kHz signal with peak-to-peak amplitude of 1 V. • A > B > C • B > A > C • B > C > A • B > A = C • C > A > B Rank the three circuits according to the peak-to-peak amplitude of Vout.

  11. For Vin as shown, rank outputs 1, 2, and 3 according to peak-to-peak amplitude from largest to smallest • 1 > 2 > 3 • 1 > 2 = 3 • 2 = 3 > 1 • 2 > 3 > 1 • 3 > 2 = 1

  12. Suppose a 1-kΩ resistor is added to the circuit as shown at right. When the resistor is added, the peak-to-peak amplitude of output 1 (for the same input signal) will: • Increase • Decrease • Remain the same • Not enough information

  13. Vin is a 1 kHz signal with peak-to-peak amplitude of 1 V. • A > B > C • B > A > C • B > C > A • B > A = C • C > A > B Rank the three circuits according to the peak-to-peak amplitude of Vout.

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