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 C_L·V_DD². Therefore, lowering the supply voltage V_DD 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 V_DD and hence EDP is proportional to V_DD. Consequently, lowering V_DD also benefits EDP.^[1]

See also

• Voltage scaling
• Switching power

References

1. Gaudet, Vincent C. (2014-04-01) [2013-09-25]. "Chapter 4.1. Low-Power Design Techniques for State-of-the-Art CMOS Technologies". Written at Freiberg, Germany. In Steinbach, Bernd [in German] (ed.). Recent Progress in the Boolean Domain (1 ed.). Newcastle upon Tyne, UK: Cambridge Scholars Publishing. pp. 187–212. ISBN 978-1-4438-5638-6. Retrieved 2019-08-04. (xxx+428 pages)

Further reading

• Sah, Chih-Tang (1991-07-11). Fundamentals of Solid-State Electronics (1 ed.). World Scientific. ISBN 978-9-81020637-6.
• Singh, Brahmadeo Prasad; Singh, Rekha (2008). Electronic Devices and Integrated Circuits. Prentice-Hall Of India Pvt. Limited. ISBN 978-8-12033192-1.
• Soudris, Dimitrios; Piguet, Christian; Goutis, Costas, eds. (2002-10-31). Designing CMOS Circuits for Low Power. European Low-Power Initiative for Electronic System Design. Springer US. ISBN 978-1-40207234-5.
• Nebel, Wolfgang; Mermet, Jean, eds. (1997-06-30). Low Power Design in Deep Submicron Electronics. NATO ASI Series. Vol. 337. Kluwer Academic Publishing. ISBN 0-7923-4569-X. ISSN 0168-132X. {{cite book}}: |work= ignored (help)