A smartphone processor, operating at supply voltage 1 V and switching frequency
ID: 3716465 • Letter: A
Question
A smartphone processor, operating at supply voltage 1 V and switching frequency 1 GHz, has dynamic power consumption of 0.5 W when it is being actively used, and zero when it is not active. It also has static (or leakage) power consumption of 10 mW (10e-3 W). The phone is actively used for 5 minutes out of every hour.
(Remember that 1 watt = 1 joule / second)
How much energy is consumed by dynamic power during a typical hour? ________ joules
How much energy is consumed by static power in an hour? ________ joules
How much total energy is consumed in an hour? ________ joules
Now suppose the engineering team manages to redesign the processor so that it runs at a lower voltage of 0.5 V and at a lower frequency of 0.5 GHz. Assume the capacitive load was unchanged.
What is the dynamic power consumption of this redesigned processor? ________ W
If the phone is still actively used for only 5 minutes out of every hour, how much energy is consumed by dynamic power in an hour? ________ joules
The correct answers are 150, 36, 186, 0.062|0.063, 18.6|18.9, | means between this range. Please show me how you got these answers.
Explanation / Answer
Solution:
0.5 W is burning
In joule
0.5 * (1*10) = 5 joule/sec
In one hour 5 min is actively used
which will make it
5*60 = 300 sec will take
300-5*10^8 = 150 Jules
rest of the 55 minutes is inactive= 55*60 = 3300
10 * 10^(-3) * 10 * 3300 = 33 Joules
Total = 183 Joules
Now suppose the engineering team manages to redesign the processor so that it runs at a lower voltage of 0.5 V and at a lower frequency of 0.5 GHz. Assume the capacitive load was unchanged.
What is the dynamic power consumption of this redesigned processor? ________ W
0.125 W
If the phone is still actively used for only 5 minutes out of every hour, how much energy is consumed by dynamic power in an hour? ________ joules
2.5*15 = 37.5
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