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Soft Error Rate Reduction in Bucket Sense Amplifiers

IP.com Disclosure Number: IPCOM000044092D
Original Publication Date: 1984-Nov-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Thoma, EP: AUTHOR

Abstract

A bucket sense amplifier is rendered less sensitive to leakage-induced failures (such as are caused by alpha particles or silicon defects) by keeping the internal device nodes shorted as long as possible during inactive time intervals. A pair of transistors is added to shunt the sense nodes of all sense amplifiers to the common latch node. Further, capacitive coupling is provided to the latch node to insure that the bucket devices are off during inactive time intervals. The shunting devices and capacitive coupling prevents the bucket transistors from conducting charge during inactive time intervals. Transistors 7 and 8 perform the above-described shunting function. The capacitive coupling is provided by capacitor C3. At the beginning of an active cycle, nodes 1, 2, and 3 have a voltage level of approximately VH-0.4 volt.

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Soft Error Rate Reduction in Bucket Sense Amplifiers

A bucket sense amplifier is rendered less sensitive to leakage-induced failures (such as are caused by alpha particles or silicon defects) by keeping the internal device nodes shorted as long as possible during inactive time intervals. A pair of transistors is added to shunt the sense nodes of all sense amplifiers to the common latch node. Further, capacitive coupling is provided to the latch node to insure that the bucket devices are off during inactive time intervals. The shunting devices and capacitive coupling prevents the bucket transistors from conducting charge during inactive time intervals. Transistors 7 and 8 perform the above- described shunting function. The capacitive coupling is provided by capacitor C3. At the beginning of an active cycle, nodes 1, 2, and 3 have a voltage level of approximately VH-0.4 volt. Bit lines 14 and 15 have a voltage level of VH minus the threshold voltage of bucket devices T9 and T10. Node VA is at approximately 12 volts, and the Restore node is at VH volts. The Amplify, Set Latch, and VSB nodes are at ground. As the cycle begins, VSB charges to VH volts, thus coupling nodes 1, 2, and 3 to approximately VH volts. Subsequently, node VA is discharged from 12 volts down to VH volts, thus turning off devices T7 and T8. As a result, nodes 1 and 2 are no longer clamped and the circuit is ready to sense signals on bit lines 14 and 15. Sensing is begun by coupling nodes 1 and 2 more positive, whi...