Two loop superconducting sigma-delta analog-to-digital converter

Details Two loop superconducting sigma-delta analog-to-digital converter Two loop superconducting sigma-delta analog-to-digital converter

1991-12-12

1993-03-30

Logan, Sharon D.

Coded data generation or conversion

Analog to or from digital conversion

With particular solid state devices

341143, H03M 300

Patent

active

051988151

ABSTRACT:
A two-loop superconducting sigma-delta analog-to-digital converter includes a first superconducting inductor to which the analog signal is applied. A resistor converts to current in the first inductor to a voltage which is applied to a second superconducting inductor. The current in the second inductor, which increases quadradically with time, is applied to an overdamped Josephson junction which kicks back a single quantum voltage pulse each time its critical current is exceeded. This pulse reduces the current in the second inductor and serves as a digital ONE output. The pulses are also applied to an underdamped Josephson junction in a feedback pulse generator which latches at its gap voltage for the remainder of a half cycle of an ac bias current. This provides a voltage source for the primary of a superconducting transformer having a mutual inductance which produces sufficient flux in the secondary to cause a SQUID to generate in response to each pulse from the quantizer a selected number of feedback pulses which are applied to the first inductor.

REFERENCES:
patent: 4315255 (1982-02-01), Harris et al.
patent: 4983971 (1991-01-01), Przybysz et al.
patent: 5019818 (1991-05-01), Lee
patent: 5140324 (1992-08-01), Przybysz et al.
James C. Candy, A Use of Double Integration in Sigma Delta Modulation, 1985 IEEE Transactions on Communications, vol. Com 33, No. 3, Mar. 1985, pp. 249-258.
V. K. Kaplunenko et al., Experimental Study of the RSFQ Logic Elements, IEEE, Trans. on Mugn., Vo. MAG-25, pp. 861-864, Mar., 1989.

Affiliated with

Also associated with

Rating

Two loop superconducting sigma-delta analog-to-digital converter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Two loop superconducting sigma-delta analog-to-digital converter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Two loop superconducting sigma-delta analog-to-digital converter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1284223