High sensitivity superconductive digitizer
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 21, 1993
Grant Date -
N/A
app pub date -
Jul 22, 1992
filing date -
Jul 22, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A high-sensitivity superconductive digitizer (10) which utilizes a dc superconducting quantum interference device (SQUID) (38) to convert an input current or magnetic flux into a frequency signal which is converted by a counter (60) into a digital representation of the input. This measurement requires that the SQUID (38) be operated in a linear region of its periodically varying output. To insure locking the system into a fixed point in the periodic signal, a digital flux-locked loop is employed which utilizes a digital integrator (70) and digital to analog converter (72) in a feedback loop. A waveform generator (46) produces a dithering modulation waveform in the SQUID (38) and an up-down counter (60) finds difference signals between alternating waveforms. This difference signal is then fed to a digital integrator (70) and converted to analog by a digital to analog converter (72) and fed back to the SQUID in a feed-back loop to lock the SQUID (38) to a fixed operating point.) The analog to digital converter (10) of the present invention offers very high sensitivity with low power dissipation and very high speed.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully