Static information storage and retrieval – Systems using particular element – Ferroelectric
Reexamination Certificate
2006-10-03
2006-10-03
Elms, Richard (Department: 2824)
Static information storage and retrieval
Systems using particular element
Ferroelectric
C365S149000, C438S003000
Reexamination Certificate
active
07116572
ABSTRACT:
A ferroelectric reference circuit generates a reference voltage proportional to (P+U)/2 and is automatically centered between the bit line voltages corresponding to the P term and the U term across wide temperature and voltage ranges. To avoid fatiguing the reference ferroelectric capacitors generating (P+U)/2, the reference voltage is refreshed once every millisecond. To eliminate the variation of the reference voltage due to the leakage in the ferroelectric capacitors during this period of time, the reference voltage generated from the reference ferroelectric capacitors is digitized when it is refreshed. The digital value is fixed and converted to an analog value which is then fed into sense amplifiers for resolving the data states. The reference voltage is automatically at the center of the switching (P) and non-switching (U) signals and therefore the signal margin is maximized.
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Chu Fan
Du Xiao-Hong
Sommervold Bob
Sun Shan
Hogan & Hartson L.L.P.
Ramtron International Corporation
Wendler Eric J.
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