Static information storage and retrieval – Systems using particular element – Capacitors
Patent
1987-03-30
1989-03-07
Moffitt, James W.
Static information storage and retrieval
Systems using particular element
Capacitors
365194, 365205, 365210, G11C 1124, G11C 700
Patent
active
048112909
ABSTRACT:
A dynamic random access memory including a sense amplifier having MOSFETs, which constitute a flip-flop, and an activating MOSFET. A memory cell includes a switching MOSFET and a capacitor having a grooved structure. A dummy cell includes a switching MOSFET and capacitor having a planar structure. The activating MOSFET has its gate coupled to a gate bias generator, which comprises a reference capacitor group consisting of planar type capacitors having a nearly constant capacitance, irrespective of the influence of process parameters, and a monitoring capacitor group consisting of capacitors having the same grooved structure and the same capacitance as the memory cell capacitor. The reference capacitor group, and the monitoring capacitor group are pre-charged. When the sensing operation starts, the reference capacitor group and the monitoring capacitor group are short-circuited, so that a charge reallocation is executed between these groups. When a word line driver functions, the gate of the switching MOSFET of the memory cell is open, thus transferring data of the memory cell capacitor and dummy cell capacitor onto bit line BL and BL. The voltage of the node between the reference and monitoring capacitor groups, which are short-circuited, is applied to the gate of the activating MOSFET of the sense amplifier after a predetermined time delay.
REFERENCES:
patent: 4421996 (1983-12-01), Chuang et al.
Lynch, Boll: Optimization of the Latching Pulse for Dynamic Flip-Flop Sensors, in: IEEE Journal of Solid-State Circuits, vol. SC-9, No. 2, Apr. 1974, pp. 49-54.
H. Masuda et al: "A 5V-Only 64K Dynamic RAM Based on High S/N Design", IEEE J. Solid State Circuits, SC-15, pp. 846-854 (1980).
Kabushiki Kaisha Toshiba
Moffitt James W.
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