Low-Power System Design at TU München

Flashcards and summaries for Low-Power System Design at the TU München

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Exemplary flashcards for Low-Power System Design at the TU München on StudySmarter:

What is the motivation behind Low Power solutions?

Exemplary flashcards for Low-Power System Design at the TU München on StudySmarter:

What makes power management a critical design issue?

Exemplary flashcards for Low-Power System Design at the TU München on StudySmarter:

What is Dennard scaling?
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Exemplary flashcards for Low-Power System Design at the TU München on StudySmarter:

What is the main challenge at very small transistor sizes?

Exemplary flashcards for Low-Power System Design at the TU München on StudySmarter:

What is the thermal design power?

Exemplary flashcards for Low-Power System Design at the TU München on StudySmarter:

What is dark silicon?

Exemplary flashcards for Low-Power System Design at the TU München on StudySmarter:

What is dynamic power consumption? What are the reasons for it?
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Exemplary flashcards for Low-Power System Design at the TU München on StudySmarter:

What is static power consumption? What are the reasons for it?

Exemplary flashcards for Low-Power System Design at the TU München on StudySmarter:

Which currents dominate the CMOS inverter in locking, switching and in conducting state?

Exemplary flashcards for Low-Power System Design at the TU München on StudySmarter:

Define SOC, DOD, SOH and EOL in battery context

Exemplary flashcards for Low-Power System Design at the TU München on StudySmarter:

What are the two main factors in battery aging?
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What is a common charging protocol?

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Exemplary flashcards for Low-Power System Design at the TU München on StudySmarter:

Low-Power System Design

What is the motivation behind Low Power solutions?
- Prolong battery life - Smaller battery for portable devices - Lower temperature of the device - Lower electric bills

Low-Power System Design

What makes power management a critical design issue?
- Markt demands to maintain working temperature at acceptable level. Thermal design power requirement.

Low-Power System Design

What is Dennard scaling?
- As transistors get smaller, power density stays constant (capacitance, voltage and current decrease)

Low-Power System Design

What is the main challenge at very small transistor sizes?
Leakage current

Low-Power System Design

What is the thermal design power?
Maximum amount of heat on a chip that can be dissipated during any workload.

Low-Power System Design

What is dark silicon?
Amount of circuitry that can not be powered-on at the nominal operating voltage for a given thermal design power (TDP) constraint.

Low-Power System Design

What is dynamic power consumption? What are the reasons for it?
Current flow from Vdd to GND when logic transition occurs -> Switching power, short-circuit power, glitch power

Low-Power System Design

What is static power consumption? What are the reasons for it?
Current flow from Vdd to GND regardless of logic transition, DC current, Leakage power

Low-Power System Design

Which currents dominate the CMOS inverter in locking, switching and in conducting state?
Locking: Subthreshold current, gate tunneling Switching: Hot Carrier injection Conducting: Gate tunneling

Low-Power System Design

Define SOC, DOD, SOH and EOL in battery context
State of Charge = Depth of Discharge = percentage of available charge State of Health = Percentage of available capacity End of Life = unusable level of SOH, around 70 or 80%

Low-Power System Design

What are the two main factors in battery aging?
Calendar Aging- Aging during storage, due to temperature and average SOC Cycle Aging- Aging is increased when battery is cycled, Battery temperature, discharge current, SOC swing

Low-Power System Design

What is a common charging protocol?
Constant Current Constant Voltage

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