5.2.1 - Threshold Voltage (VthV_{th}) Variation
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Practice Questions
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What does Vth stand for?
💡 Hint: Think about what voltage makes a transistor switch on.
Name one source of Vth variation.
💡 Hint: Consider what might change during the fabrication process.
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Interactive Quizzes
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What is the effect of increased doping concentration on Vth?
💡 Hint: Think about what happens when a material gets 'more crowded' with impurities.
True or False: Thicker gate oxide decreases control over the channel.
💡 Hint: Consider how the gate needs to effectively influence the channel for the transistor to switch.
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Challenge Problems
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Suppose a CMOS circuit has an average Vth of 0.5V. If doping concentration increases by 20%, predict the new Vth and discuss the implications for the circuit's performance.
💡 Hint: Use the relationship between doping and Vth to inform your prediction.
Design a simple circuit that incorporates redundancy to combat Vth variation and explain how it would mitigate performance losses.
💡 Hint: Consider how having backups in a system can improve reliability.
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