Browse Prior Art Database

Multistable Core Counter Sensing

IP.com Disclosure Number: IPCOM000097637D
Original Publication Date: 1961-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

James, RL: AUTHOR [+2]

Abstract

Core 1 and its associated circuitry act as a blocking oscillator to supply core 2 with constant volt-second pulses P. These pulses P(1) to P(n) change the flux of core 2 from -Br to +Br. Core 2 offers a high resistance during these flux changes. Pulse P(n + 1) causes very little flux change if Br/Bm is approximately equal to 1 and very little resistance is offered to the flow of this pulse.

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Multistable Core Counter Sensing

Core 1 and its associated circuitry act as a blocking oscillator to supply core 2 with constant volt-second pulses P. These pulses P(1) to P(n) change the flux of core 2 from -Br to +Br. Core 2 offers a high resistance during these flux changes. Pulse P(n + 1) causes very little flux change if Br/Bm is approximately equal to 1 and very little resistance is offered to the flow of this pulse.

Previous circuits have allowed the drive current of core 2 to far exceed H when saturation was reached. The excessive drive makes Bm larger and causes the pulse P(n + 1) to switch more flux, thereby reducing the reliability of the counter. This circuit limits the P(n + 1) drive current to a value Id2 which is determined by a resistor R6. As long as core 2 goes through a partial flux change, diode D2 conducts. When core 2 saturates and no longer offers a high resistance to Ic, diode D2 cuts off and is limited by the resistor R6. The output voltage can be used to turn on a transistor to reset core 2, thereby giving an output and reset on every P(n + 1) pulse.

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