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EP0487808A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Memories with unbalanced loads and with compensation

Assignee: STMicroelectronics SRL
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Filing: 1990-11-19
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Granted: —
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Expires: 2010-11-19
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Abstract

Abstract The sense circuit recognizes the virgin or programmed status of cells in storage devices such as non-volatile memories, of the type with unbalanced loads, and comprises a sense amplifier (SA) having a first input (Y) connected to a number of selectable virgin reference cells (T vr1 , T vr2 ), and a second input (X) connected to a number of selectable matrix cells (T vm , T pm ). According to the invention, a compensatory programmed cell (NP) is connected with its source to ground, with its drain to the first input (Y) of the sense amplifier (SA), and with its gate to a voltage source (V cc ) which is high at least while the sense amplifier reads a selected matrix cell.

Inventors

  • 👤 Luigi Pascucci
  • 👤 Marco Olivo

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-30 06:38
CPC Classifications
G; G11; G11C; G11C16/00; G11C16/02; G11C16/06; G11C16/26; G11C16/28

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 123 words
An improved sense circuit for recognizing the virgin or programmed status of cells in storage devices such as non-volatile memories, of the type with unbalanced loads, comprising a sense amplifier (SA) having a first input (Y) connected to a number of selectable virgin reference cells (T vr1 , T vr2 ), and a second input (X) connected to a number of selectable matrix cells (T vm , T pm ), characterized in that a compensatory programmed cell (NP) is connected with its source to ground, with its drain to the first input (Y) of the sense amplifier (SA), and with its gate to a voltage source (V s ) which is high at least while the sense amplifier reads a selected matrix cell.
Claim 2
Dependent Claim 15 words
The sense circuit of claim 1, characterized in that said voltage source is permanently high.
Claim 3
Dependent Claim 25 words
The sense circuit of claim 1 or 2, characterized in that the high value of said voltage source is the value of the supply voltage.

References Cited (Backward Citations)

EP0347935A2 Cited

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