Featured Research

from universities, journals, and other organizations

Josephson Synthesizer Circuit Demonstrated

Date:
January 30, 2002
Source:
National Institute Of Standards And Technology
Summary:
NIST researchers recently demonstrated sine-wave synthesis on three superconducting integrated circuit chips using palladium-gold barrier junctions. This is a major step toward the goal of developing a waveform synthesizer—using Josephson junctions—which would provide precisely defined output voltages (up to one volt), frequencies (up to one gigahertz) and waveforms of any arbitrary shape.

NIST researchers recently demonstrated sine-wave synthesis on three superconducting integrated circuit chips using palladium-gold barrier junctions. The demonstration chips were used to make comparisons with conventional alternating current (AC) voltage standards at the part-per-million level, and provided 0.1 volt and 5 megahertz sine-wave outputs.

Related Articles


This is a major step toward the goal of developing a waveform synthesizer—using Josephson junctions—which would provide precisely defined output voltages (up to one volt), frequencies (up to one gigahertz) and waveforms of any arbitrary shape. Such a system would have practical application as an AC voltage standard source and for calibrating high-performance test and measurement instruments.

The research so far has led to a circuit with the largest direct current (DC) output voltage per junction to date using two series-coupled 3,750-junction arrays (for a total of 7,500 junctions). Constant voltage steps were measured on this circuit across a broad range of frequencies from 3 to 18 gigahertz. Also, due to the improved microwave filters incorporated in the circuits, a different circuit with 1,000 junctions was driven at bit stream drive frequencies more than a factor of two higher than any previous Josephson array circuit. This is significant because higher drive frequency directly corresponds to higher output voltage.

This progress has provided confidence that circuits can be fabricated for use with a fixed-speed, 10 gigabits-per-second, low-cost bit stream generator that is under construction.


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. "Josephson Synthesizer Circuit Demonstrated." ScienceDaily. ScienceDaily, 30 January 2002. <www.sciencedaily.com/releases/2002/01/020130073759.htm>.
National Institute Of Standards And Technology. (2002, January 30). Josephson Synthesizer Circuit Demonstrated. ScienceDaily. Retrieved December 21, 2014 from www.sciencedaily.com/releases/2002/01/020130073759.htm
National Institute Of Standards And Technology. "Josephson Synthesizer Circuit Demonstrated." ScienceDaily. www.sciencedaily.com/releases/2002/01/020130073759.htm (accessed December 21, 2014).

Share This


More From ScienceDaily



More Matter & Energy News

Sunday, December 21, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Building Google Into Cars

Building Google Into Cars

Reuters - Business Video Online (Dec. 19, 2014) Google's next Android version could become the standard that'll power your vehicle's entertainment and navigation features, Reuters has learned. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
AP Review: Nikon D750 and GoPro Hero 4

AP Review: Nikon D750 and GoPro Hero 4

AP (Dec. 19, 2014) What to buy an experienced photographer or video shooter? There is some strong gear on the market from Nikon and GoPro. The AP's Ron Harris takes a closer look. (Dec. 19) Video provided by AP
Powered by NewsLook.com
Double-Amputee Becomes First To Move Two Prosthetic Arms With His Mind

Double-Amputee Becomes First To Move Two Prosthetic Arms With His Mind

Buzz60 (Dec. 19, 2014) A double-amputee makes history by becoming the first person to wear and operate two prosthetic arms using only his mind. Jen Markham has the story. Video provided by Buzz60
Powered by NewsLook.com
Navy Unveils Robot Fish

Navy Unveils Robot Fish

Reuters - Light News Video Online (Dec. 18, 2014) The U.S. Navy unveils an underwater device that mimics the movement of a fish. Tara Cleary reports. Video provided by Reuters
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