Practice Power Consumption (6.5.2) - Digital CMOS Logic Design - Part 1: Principles of Digital CMOS Logic Gates

Practice: Power Consumption

Lesson 6.5.2Digital CMOS Logic Design - Part 1: Principles of Digital CMOS Logic Gates

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6 sample questions

Question 1.
What is static power consumption in CMOS?
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Think about when the circuit is not actively changing state.
Question 2.
What does dynamic power consumption depend on?
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Remember the formula P=αCV²f.
3Question 3.
What is the formula for dynamic power consumption in CMOS?
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Remember the terms we correlated with each variable.
4Question 4.
True or False: Static power consumption in a CMOS circuit is usually higher than dynamic power consumption.
- True
- False
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Consider when each type of power consumption occurs.
Question 5.
Consider a CMOS device with a capacitance of 10pF, operating at 2V, and switching at a frequency of 500kHz with a switching activity of 0.5. Calculate its dynamic power consumption.
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Follow the formula closely and make sure to calculate in the correct units.
Question 6.
How would the dynamic power consumption change if the switching frequency of the circuit is increased to 1 MHz while keeping everything else constant? Explain.
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Look closely at the factors within the dynamic power formula.

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