Featured Research

from universities, journals, and other organizations

Noise Measurement May Boost Cell Phone Performance

Date:
June 27, 2006
Source:
National Institute of Standards and Technology
Summary:
Researchers at the National Institute of Standards and Technology (NIST) and industry collaborators have developed improved methods for accurately measuring very faint thermal noise in electronic circuits. The technique may help improve the signal range, data rate, and battery life of cell phones and other wireless communications devices.

Researchers at the National Institute of Standards and Technology (NIST) and industry collaborators have developed improved methods for accurately measuring very faint thermal “noise”—caused by random motion of electrons—in electronic circuits. The technique may help improve the signal range, data rate and battery life of cell phones and other wireless communications devices.

Low background noise typically translates to better performance in electronics, such as longer ranges and clearer signals or higher information-carrying capacity. However, noise too low to measure means that circuit designers cannot tune the system for optimal performance. The NIST research focuses on CMOS (complementary metal oxide semiconductor) transistors, which are inexpensive and widely used in integrated circuits for wireless devices. Noise levels for CMOS transistors have, until now, been too low to measure accurately in much of their signal frequency range (1 – 10 gigahertz), and as a result CMOS circuits may be poorly matched to wireless transmission systems, resulting in significant signal loss.

In a collaboration with IBM Semiconductor Research and Development Center (Essex Junction, Vt.) and RF Micro Devices (Scotts Valley, Calif.), NIST has developed and demonstrated the capability to reliably measure the noise in CMOS devices before they are cut from silicon wafers and packaged. This is believed to be the first method for on-wafer noise measurements directly linked to national standards for thermal noise power. The new measurement methods were described June 12 at the IEEE Radio Frequency Integrated Circuits Symposium in San Francisco.

The team also demonstrated the use of “reverse” noise measurements—focusing on noise emitted from the input of the transistor when incoming signals are reflected and scattered—as a tool for checking overall noise parameters. This method can improve precision, particularly of the optimal impedance properties needed in transistors to minimize noise, the team found. Reverse noise measurements also may help improve modeling of CMOS transistors.


Story Source:

The above story is based on materials provided by National Institute of Standards and Technology. Note: Materials may be edited for content and length.


Cite This Page:

National Institute of Standards and Technology. "Noise Measurement May Boost Cell Phone Performance." ScienceDaily. ScienceDaily, 27 June 2006. <www.sciencedaily.com/releases/2006/06/060627233942.htm>.
National Institute of Standards and Technology. (2006, June 27). Noise Measurement May Boost Cell Phone Performance. ScienceDaily. Retrieved September 19, 2014 from www.sciencedaily.com/releases/2006/06/060627233942.htm
National Institute of Standards and Technology. "Noise Measurement May Boost Cell Phone Performance." ScienceDaily. www.sciencedaily.com/releases/2006/06/060627233942.htm (accessed September 19, 2014).

Share This



More Matter & Energy News

Friday, September 19, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

MIT BioSuit A New Take On Traditional Spacesuits

MIT BioSuit A New Take On Traditional Spacesuits

Newsy (Sep. 19, 2014) The MIT BioSuit could be an alternative to big, bulky traditional spacesuits, but the concept needs some work. Video provided by Newsy
Powered by NewsLook.com
Virtual Reality Headsets Unveiled at Tokyo Game Show

Virtual Reality Headsets Unveiled at Tokyo Game Show

AFP (Sep. 18, 2014) Several companies unveiled virtual reality headsets at the Tokyo Game Show, Asia's largest digital entertainment exhibition. Duration: 00:48 Video provided by AFP
Powered by NewsLook.com
Apple's iOS8 Includes New 'Killswitch' To Curb Theft

Apple's iOS8 Includes New 'Killswitch' To Curb Theft

Newsy (Sep. 18, 2014) Apple's new operating system, iOS 8, comes with Apple's killswitch feature already activated, unlike all the models before it. Video provided by Newsy
Powered by NewsLook.com
Stocks Hit All-Time High as Fed Holds Steady

Stocks Hit All-Time High as Fed Holds Steady

AP (Sep. 17, 2014) The Federal Reserve signaled Wednesday that it plans to keep a key interest rate at a record low because a broad range of U.S. economic measures remain subpar. Stocks hit an all-time high on the news. (Sept. 17) Video provided by AP
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:
from the past week

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