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Midterm Preparation and Final Project Planning in Electronics Course

Attention, students! No more Thursday lectures! The mid-term is in about 3 weeks and will cover everything we've discussed in class and labs. It's time to start thinking about your final projects, with proposals due in 5 weeks. Remember the Trusty LF356 contains around a dozen transistors, while modern CPUs hold billions. Gain insights from Moore's Law, illustrating how transistor counts double every two years. Prepare for concepts like current gain and voltage output in various amplifier scenarios. Stay engaged and don’t hesitate to ask questions!

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Midterm Preparation and Final Project Planning in Electronics Course

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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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