Featured Research

from universities, journals, and other organizations

New Technique Cuts Computer Circuit Energy Needs, Maintains Speed

Date:
February 11, 1999
Source:
Penn State
Summary:
Researchers from Penn State, the University of South Florida and the University of Texas at El Paso have developed and demonstrated a new method for reducing computer circuits' energy requirements -- by more than one-half in some applications-- without cutting down on overall operating speed.

University Park, Pa. --- Researchers from Penn State, the University of South Florida and the University of Texas at El Paso have developed and demonstrated a new method for reducing computer circuits' energy requirements -- by more than one-half in some applications-- without cutting down on overall operating speed.

Related Articles


The new approach holds promise for laptop and other personal computing device users worried about their batteries running down, manufacturers who want to make more complex circuits that won't melt in full operation, and wireless communication equipment developers that need dedicated circuits with lower power demands.

The method was described in January at the 12th International Conference on VLSI Design in a paper, "Energy Efficient Datapath Synthesis Using Dynamic Frequency Clocking and Multiple Voltages." The authors are: Dr. Vamsi Krishna, University of South Florida; Dr. N. Ranganathan, The University of Texas at El Paso; and Dr. Vijaykrishnan Narayanan, assistant professor of computer science and engineering, Penn State.

Narayanan says their approach is based on combining the use of multiple voltages with a new concept, dynamic frequency clocking (DFC), which schedules energy resources on a flexible basis, according to the operations active within a circuit in a particular cycle. Energy is conserved by grouping operations in the most energy efficient patterns based on their critical path delay or the time it takes to complete the operation.

For example, Narayanan says, consider a circuit that includes three adders and a multiplier. Adders have a smaller critical path delay than multipliers. Grouping one of the fast adders with the slower multiplier allows the researchers to slow the adder down to the speed of the multiplier without slowing the overall process. To slow the adder down, the researchers supply it with a lower frequency and voltage which conserves energy. Higher voltages make signals propagate down wires faster but require more energy.

The researchers have, so far, performed simulations of their approach for some benchmark circuits particularly useful for signal and image processing computer architectures. They found that, with a suitable choice of voltage levels, their approach produces an average energy saving of 53.5 percent versus the standard, static, clocking scheme and single supply voltages.

The operation units used in the test case were three adders/subtractors and three multipliers. The voltage for the adders/subtractors could be 5.0V, 3.3V or 2.4V. The voltages for the multipliers could be either 5.0V or 3.3V. However, the authors note in their paper that their algorithm can be applied to any other combination of resource and time constraints.

In their paper, the authors note, "DFC is useful for signal and image processing applications where the complexity of operations varies. Certain procedures in such applications require only logic functions, while others require only additions and certain others multiplication or division."

The authors conclude," The results show good potential in energy minimization and can be used for a wide range of portable applications." Currently the research team is investigating using multi-cycling and chaining in conjunction with their approach for further performance improvements.


Story Source:

The above story is based on materials provided by Penn State. Note: Materials may be edited for content and length.


Cite This Page:

Penn State. "New Technique Cuts Computer Circuit Energy Needs, Maintains Speed." ScienceDaily. ScienceDaily, 11 February 1999. <www.sciencedaily.com/releases/1999/02/990211072509.htm>.
Penn State. (1999, February 11). New Technique Cuts Computer Circuit Energy Needs, Maintains Speed. ScienceDaily. Retrieved October 30, 2014 from www.sciencedaily.com/releases/1999/02/990211072509.htm
Penn State. "New Technique Cuts Computer Circuit Energy Needs, Maintains Speed." ScienceDaily. www.sciencedaily.com/releases/1999/02/990211072509.htm (accessed October 30, 2014).

Share This



More Matter & Energy News

Thursday, October 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Mind-Controlled Prosthetic Arm Restores Amputee Dexterity

Mind-Controlled Prosthetic Arm Restores Amputee Dexterity

Reuters - Innovations Video Online (Oct. 29, 2014) A Swedish amputee who became the first person to ever receive a brain controlled prosthetic arm is able to manipulate and handle delicate objects with an unprecedented level of dexterity. The device is connected directly to his bone, nerves and muscles, giving him the ability to control it with his thoughts. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Robots Get Funky on the Dance Floor

Robots Get Funky on the Dance Floor

AP (Oct. 29, 2014) Dancing, spinning and fighting robots are showing off their agility at "Robocomp" in Krakow. (Oct. 29) Video provided by AP
Powered by NewsLook.com
Saharan Solar Project to Power Europe

Saharan Solar Project to Power Europe

Reuters - Business Video Online (Oct. 29, 2014) A solar energy project in the Tunisian Sahara aims to generate enough clean energy by 2018 to power two million European homes. Matt Stock reports. Video provided by Reuters
Powered by NewsLook.com
Lowe's Testing Robot Sales Assistants in California Store

Lowe's Testing Robot Sales Assistants in California Store

Buzz60 (Oct. 29, 2014) Lowe’s is testing out what it’s describing as a robotic shopping assistant in one of its Orchard Supply Hardware Stores in California. Jen Markham explains. Video provided by Buzz60
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins