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# Cryogenic 1's Counter

IP.com Disclosure Number: IPCOM000098624D
Original Publication Date: 1959-Jun-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 27K

IBM

Sein, JJ: AUTHOR

## Abstract

Assume that the number of 1's in a register having n flip-flops must be counted. For a three stage register, it takes unit current through three turns to make a first superconductive leg A resistive, a unit of current through two turns to make a second superconductive leg B resistive, and a unit of current through a single turn to make a third superconductive leg C resistive. Each leg has a parallel path associated with it, each path containing an output coil. When all three flip-flops contain 1's, the first leg A is driven resistive, causing the passage of d.c. through coil D, to indicate three 1's. In the other two pairs of legs, the output coils are not energized because both legs (A' & B; B' & C) of each pair are resistive. When two parallel legs are resistive, the d. c.

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Cryogenic 1's Counter

Assume that the number of 1's in a register having n flip-flops must be counted. For a three stage register, it takes unit current through three turns to make a first superconductive leg A resistive, a unit of current through two turns to make a second superconductive leg B resistive, and a unit of current through a single turn to make a third superconductive leg C resistive. Each leg has a parallel path associated with it, each path containing an output coil. When all three flip-flops contain 1's, the first leg A is driven resistive, causing the passage of d.c. through coil D, to indicate three 1's. In the other two pairs of legs, the output coils are not energized because both legs (A' & B; B' & C) of each pair are resistive. When two parallel legs are resistive, the d. c. current splits between them, resulting in less than the required current in an output coil.

When only two 1's are present, the first leg A is not switched, but the second
(B) is switched to produce an output signal in its output coil E. The third pair (B' &
C) of legs does not produce an output signal because of the division of current between the two legs B' & C.

When only one 1 is present in a flip-flop, only the third superconductive leg C is driven resistive and an output signal is produced in a coil F parallel to the third leg.

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