Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1978-08-21
1980-04-01
Anagnos, Larry N.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307358, 307DIG3, 365175, 365208, H03K 518, H03K 520, G11C 706
Patent
active
041963636
ABSTRACT:
Disclosed is an improved sense amplifier/bit driver circuit including first and second transistors connected in a current mirror configuration. A bit line connected to a plurality of memory cells is connected to the collector of the first of the two transistors while the second of the transistors provides an output at its collector. A current source is connected to the base regions of both the first and second transistors for supplying current when a bit line is to be selected. Current flow through the second transistor is supplied to additional circuitry including a driver circuit, a clamping circuit and a zero filter circuit. Also disclosed is a reference voltage generator which accurately tracks the sense amplifier circuit and provides a reference voltage at or near the midpoint between a binary 1 and binary 0 level. The sense amplifier substantially senses current rather than voltage and also acts as a high power over driven bit driver.
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Chang, "Low Barrier SBD Pull-Down Driver Current Switch," IBM Tech. Discl. Bull., vol. 20, No. 2, pp. 601-603, 7/1977.
Taub, "Current-Threshold Circuit," IBM Tech. Discl. Bull., vol. 17, No. 3, pp. 750, 8/1974.
Daniels, "Current Detector," IBM Tech. Discl. Bull., vol. 17, No. 10, pp. 2963-2964, 3/1975.
Malaviya, "High Speed Sense Amplifier With Low Impedance," IBM Tech. Discl. Bull., vol. 20, No. 4, pp. 1464-1465, 9/1977.
Anagnos Larry N.
Galanthay Theodore E.
International Business Machines - Corporation
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