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Bitline Monitor

IP.com Disclosure Number: IPCOM000043349D
Original Publication Date: 1984-Aug-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Fitzgerald, BF: AUTHOR [+5]

Abstract

The bitline monitor provides a relative measurement of signal and noise on the bitline of a high density random-access memory (RAM) without disturbing its operation. It is a single-device field-effect transistor (FET) with its gate connected to a bitline and its drain and source connected in two different ways. In the first method, the drain is connected to Vh on the chip and the source is connected to metal for an external resistor to ground, making a source follower, following the bitline. In the second method, the source is connected to ground or substrate potential and the drain is connected to metal for an external probe to which is attached a current amplifier. In the first method, any enhancement-mode threshold device is appropriate. In the second method, any enhancement or depletion-mode device is appropriate.

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Bitline Monitor

The bitline monitor provides a relative measurement of signal and noise on the bitline of a high density random-access memory (RAM) without disturbing its operation. It is a single-device field-effect transistor (FET) with its gate connected to a bitline and its drain and source connected in two different ways. In the first method, the drain is connected to Vh on the chip and the source is connected to metal for an external resistor to ground, making a source follower, following the bitline. In the second method, the source is connected to ground or substrate potential and the drain is connected to metal for an external probe to which is attached a current amplifier. In the first method, any enhancement- mode threshold device is appropriate. In the second method, any enhancement or depletion-mode device is appropriate. Two devices are required on the chip to monitor both halves of a bitline associated with a sense amplifier. Because it introduces no external noise to the bitline, previously unknown sources have been detected.

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