Static information storage and retrieval – Systems using particular element – Ferroelectric
Patent
1997-12-08
2000-01-18
Nelms, David
Static information storage and retrieval
Systems using particular element
Ferroelectric
365149, 365 65, G11C 1122
Patent
active
06016266&
ABSTRACT:
An object of the present invention is to provide a semiconductor device having a ferroelectric capacitor wherein the ferroelectric capacitor is difficult to get bad electric property. In a capacitor unit CbU for load, a bridge circuit is made including a ferroelectric capacitor Cb for load, transistors Q1, Q2, Q3 and Q4. The both ends of the bridge circuit is connected with a bit line /BL1 and the ground G, respectively. A line SWS is connected with the gates of both transistors Q1 and Q3 and further is connected with the gate of both transistors Q2 and Q4 via an inverter 104. A switch-signal generating circuit 102 shifts the level of switch signal for the line SWS whenever the number of leading edges of the line GCP reaches a predetermined number. According the shifted switch signal, the direction of the capacitor Cb for load in its bridge circuit is changed. That can prevent the capacitor Cb for load from getting a bad electric property.
REFERENCES:
patent: 5508954 (1996-04-01), Mihara et al.
patent: 5530668 (1996-06-01), Chern et al.
patent: 5546342 (1996-08-01), Nakane et al.
patent: 5726930 (1998-03-01), Hasegawa et al.
patent: 5754466 (1998-05-01), Arase
Nelms David
Nguyen Tuan T.
Rohm & Co., Ltd.
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