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3 cards from this section. Quick, good the night before a test.
What is subthreshold conduction?
Think about the conditions for current flow in transistors.
Why is subthreshold operation useful?
Consider applications that require battery efficiency.
What happens when the gate-source voltage is below the threshold voltage?
Think about what subthreshold conduction means.
True or False: Subthreshold operation can lead to significant power savings in low-power devices.
Consider the applications of subthreshold operation.
A subthreshold CMOS device operates at a threshold voltage of 0.4 V and the thermal voltage is 26 mV. If the gate-source voltage is set to 0.3 V and I0 is known to be 2 µA, calculate the subthreshold current ID.
Ensure you’re applying the correct voltage values in the exponential equation.
Evaluate the performance implications of using subthreshold conduction in a wearable device expected to operate for weeks on a small battery.
Think about the balance between performance and power efficiency.
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