Folded bit line ferroelectric memory device

Details Folded bit line ferroelectric memory device Folded bit line ferroelectric memory device

1995-05-26

1996-07-30

Nelms, David C.

Static information storage and retrieval

Systems using particular element

Ferroelectric

365149, 36518909, 365210, G11C 1122

Patent

active

055418724

ABSTRACT:
Described herein is a reference voltage circuit which includes, in combination, a bit line and first and second word line reference transistors connected to the bit line and operative to be turned on with a reference pulse simultaneously with the turning on of the word lines in the main memory circuit. First and second ferroelectric capacitors are connected to each of the first and second word line reference transistors, respectively, and to a source of plate line switching voltage, and a first precharging transistor is connected between the first ferroelectric capacitor and ground potential. A second precharging transistor is connected between the second ferroelectric capacitor and a further source of switching voltage, so that the first and second ferroelectric capacitors are polarized in a ONE and ZERO state in the manner identical to the logic states of the ferroelectric capacitors in the main ferroelectric memory circuit. Thus, when the first and second word line reference transistors turn on, the bit line reference voltage is raised above ground potential by the sum of the voltages of the first and second ferroelectric capacitors. This in turn causes the bit line reference voltage, BL, to track the voltage variations of the ferroelectric capacitors in the main memory circuit, thus providing improved margins for the BL and BL complementary signals which are sensed by a plurality of sense amplifiers for the main memory circuit.

REFERENCES:
patent: 4809225 (1989-02-01), Dimmler et al.
patent: 4873664 (1989-10-01), Eaton, Jr.
patent: 4888733 (1989-12-01), Mobley
patent: 5010518 (1991-04-01), Toda
patent: 5086412 (1992-02-01), Jaffe et al.
patent: 5218566 (1993-06-01), Papaliol
patent: 5305273 (1994-04-01), Jinbo
patent: 5424975 (1995-06-01), Lowrey et al.

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