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Terminal Circuit for Combined Drive and Sense Conductors in Core Storage Apparatus

IP.com Disclosure Number: IPCOM000095670D
Original Publication Date: 1964-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Pricer, WD: AUTHOR [+2]

Abstract

Two conductors 1 and 2 pass through a respective column of cores in a core storage apparatus. One end of each of the conductors is connected to the output of bit driver 3. The other ends of the conductors are connected to a terminal circuit including a transmission line transformer. The latter ends of the conductors are connected to the respective ends of primary 6 of the transformer. Secondary 7 of the transformer is center-tapped and the center tap is grounded. The ends of secondary 7 are connected through a respective resistor 4 and 5 to respective ends of primary 6. The end of secondary 7 connected to resistor 5 also connects through resistor 8 and sense amplifier 9 to ground. Resistors 4 and 5 are matched to the impedances of conductors 1 and 2, respectively.

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Terminal Circuit for Combined Drive and Sense Conductors in Core Storage Apparatus

Two conductors 1 and 2 pass through a respective column of cores in a core storage apparatus. One end of each of the conductors is connected to the output of bit driver 3. The other ends of the conductors are connected to a terminal circuit including a transmission line transformer. The latter ends of the conductors are connected to the respective ends of primary 6 of the transformer. Secondary 7 of the transformer is center-tapped and the center tap is grounded. The ends of secondary 7 are connected through a respective resistor 4 and 5 to respective ends of primary 6. The end of secondary 7 connected to resistor 5 also connects through resistor 8 and sense amplifier 9 to ground. Resistors 4 and 5 are matched to the impedances of conductors 1 and 2, respectively. Resistor 8 is chosen correctly to terminate the transformer secondary.

In operation, a bit signal produced by bit driver 3 passes through both conductors 1 and 2, and through the respective part of secondary 7 to ground. This is because the potential drops across resistors 4 and 5 are equal and the transformer acts as an open circuit. A sense signal generated in one of windings 1 and 2 causes the potential drops across resistors 4 and 5 to be unequal. The path through the transformer thus becomes a short-circuit to the path through the appropriate resistor 4 or 5. Thus, the sense signal passes through matching resistor 8...