Power–delay product
In digital electronics, the power–delay product (PDP) is a figure of merit correlated with the energy efficiency of a logic gate or logic family.[1] Also known as switching energy, it is the product of power consumption P (averaged over a switching event) times the input–output delay or duration of the switching event D.[1] It has the dimension of energy and measures the energy consumed per switching event.
In a CMOS circuit the switching energy and thus the PDP for a 0-to-1-to-0 computation cycle is CL·VDD2. Therefore, lowering the supply voltage VDD lowers the PDP.[1]
Energy-efficient circuits with a low PDP may also be performing very slowly, thus energy–delay product (EDP), the product of E and D (or P and D2), is sometimes a preferable metric.[1]
In CMOS circuits the delay is inversely proportional to the supply voltage VDD and hence EDP is proportional to VDD. Consequently, lowering VDD also benefits EDP.[1]
See also
- Voltage scaling
- Switching power
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Steinbach, Bernd, ed (2014-04-01). "Chapter 4.1. Low-Power Design Techniques for State-of-the-Art CMOS Technologies". Recent Progress in the Boolean Domain (1 ed.). Newcastle upon Tyne, UK: Cambridge Scholars Publishing. pp. 187–212. ISBN 978-1-4438-5638-6. https://books.google.com/books?id=_pwxBwAAQBAJ. Retrieved 2019-08-04. [1] (455 pages)
Further reading
- Fundamentals of Solid-State Electronics (1 ed.). World Scientific. 1991-07-11. ISBN 978-9-81020637-6. https://books.google.com/books?id=vC8vNFCUgkUC&pg=PA581.
- Electronic Devices and Integrated Circuits. Prentice-Hall Of India Pvt. Limited. 2008. ISBN 978-8-12033192-1. https://books.google.com/books?id=2aqtlybkFE0C&pg=PA383.
- Designing CMOS Circuits for Low Power. European Low-Power Initiative for Electronic System Design. Springer US. 2002-10-31. ISBN 978-1-40207234-5. https://books.google.com/books?id=86oXI7MWw8AC&pg=PA85.
- Low Power Design in Deep Submicron Electronics. NATO ASI Series. 337. Kluwer Academic Publishing. 1997-06-30. ISBN 0-7923-4569-X. https://books.google.com/books?id=1orS8Ab0Mv0C&pg=PA219.
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