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Browse Prior Art Database

Detector for Magnetic Memory

IP.com Disclosure Number: IPCOM000092495D
Original Publication Date: 1966-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Vanderslice, WB: AUTHOR

Abstract

The circuit receives signals at input terminal 2 that have either a positive or negative polarity to represent 1 and 0 logic values. At output terminal 3, the circuit produces one of two voltage levels according to the polarity of the input signal. The circuit particularly detects signals produced by a magnetic memory.

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Detector for Magnetic Memory

The circuit receives signals at input terminal 2 that have either a positive or negative polarity to represent 1 and 0 logic values. At output terminal 3, the circuit produces one of two voltage levels according to the polarity of the input signal. The circuit particularly detects signals produced by a magnetic memory.

Transistors 4...6 have their emitter terminals coupled by resistor R7. T5 has its base connected to receive a strobe input. Except during a read operation, the strobe input level of T5 is high enough to turn it on and thus turn off T4 and T6. During a read operation, T5 is turned off and T4 and T6 function as a differential amplifier.

Resistor R9 and capacitor C10 couple the base terminal of T4 to receive the signal at terminal 2. C10 isolates T4 from direct voltages at terminal 2. A shorted transmission line 12 connects the base of T4 to ground. During a write operation, voltages associated with the bit currents appear at terminal 2. One function of line 12 is to restore the base of T4 to ground before each read operation.

T6 has tunnel diode D8 connected in its collector circuit. The common connection point of D8 and the collector terminal forms output terminal 3. T6 has its base connected to ground so that it turns off in response to a positive polarity input signal and it conducts at a high current level in response to a negative polarity input signal. When T6 conducts at a low current level, D8 operates in a low-voltage state and thus signifies a positive polarity signal at input 2. When T6 conducts at a high level, D8 is triggered into a high-voltag...