Boots – shoes – and leggings
Patent
1996-03-01
1999-02-02
Teska, Kevin J.
Boots, shoes, and leggings
395500, G06F 9455
Patent
active
058674055
ABSTRACT:
A method and apparatus for simulating the design of a ferroelectric circuit uses a processor (501). The processor (501) executes a simulator (540) from memory (538) to exercise a ferroelectric model (544). The ferroelectric model (544) keeps track of turning points or extrema points (FIGS. 11-17) in a history data file (542). This history data in file (542) is then used with eqs. 3-11 herein to curve model between voltage/charge history points from the file (542) and a current operating voltage/charge point of the ferroelectric device. This curve modeling effectively and efficiently determines the charge stored in a ferroelectric capacitor (FIGS. 7 or 8) as voltage across the ferroelectric capacitor is varied over time and temperature. History data points are selectively removed from the data file (542) to maintain and enable time-efficient determination of charge (Q) in the ferroelectric device over time.
REFERENCES:
Evans et al., "A Ferroelectric Capacitor Simulation Model", IEEE 7th Int'l Sypm Appl. of Ferroelectrics, 1991, p. 692-697.
Clark et al. "Ferroelectric Thin-Film Connections in IC Neural Networks" IEEE 7th Int'l Symp Appl. of Ferroelectrics, 1991, 730-2.
Schwank et al. "Total-Dose Radiation-Induced Degration of Thin Film Ferroelectrics Capacitors", IEEE Trans on Nuclear Sci, vol. 37, No. 6, Dec. 1990 pp. 1703-1712.
Contla et al., "Simple Model For the Design of Polymeric Piezelectric Ultrasonic Transducers", IEEE Conf. on Acoustic Sensing & Imaging (Mar. 1993) pp. 1-6.
Dunn, "A Ferroelectric Capacitor Macromodel & Parameterization Algorithm For Spice Simulation", IEEE Trans on Ultrasonics, Ferroelectrics & Freq. Ctrl, vol. 41 No. 3, May 1994 pp. 360-369.
Jiang Bo
Jones Robert E.
Zurcher Peter
Motorola Inc.
Teska Kevin J.
Walker Tyrone V.
Witek Keith E.
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