Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Signal level or switching threshold stabilization
Reexamination Certificate
2005-01-18
2005-01-18
Tan, Vibol (Department: 2819)
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Signal level or switching threshold stabilization
C326S026000, C326S027000, C327S170000, C327S391000
Reexamination Certificate
active
06844755
ABSTRACT:
Methods and systems for maintaining desired circuit and/or signal characteristics, such as impedance matching characteristics and rise and fall time characteristics, over a range of PVT variations. In an embodiment, a PVT compensating circuit senses one or more circuit and/or signal characteristics at an output pad or terminal. When the one or more circuit and/or signal characteristics are affected by PVT variations in the IC and/or load, the PVT compensating circuit controls a variable output drive to maintain the one or more circuit and/or signal characteristics within a desired or predetermined range. The PVT compensating circuit is designed to compensate over a range of PVT variations. In an embodiment, the PVT compensating circuit senses a rate of voltage change over time (i.e., dV/dt), of an output signal at the output terminal. During state transitions of the output signal, the output signal is adjusted as needed to maintain a desired, or pre-determined, rate of voltage change. The invention further provides impedance matching characteristics.
REFERENCES:
patent: 5719509 (1998-02-01), Chan
patent: 5877647 (1999-03-01), Vajapey et al.
patent: 6060907 (2000-05-01), Vishwanthaiah et al.
patent: 6137322 (2000-10-01), Ten Eyck
patent: 6144218 (2000-11-01), Smith et al.
patent: 6177819 (2001-01-01), Nguyen
patent: 6184730 (2001-02-01), Kwong et al.
patent: 6552583 (2003-04-01), Kwong
patent: 6583644 (2003-06-01), Shin
patent: 6670821 (2003-12-01), Ajit
patent: 20010026178 (2001-10-01), Itoh et al.
patent: 40 18 754 (1991-12-01), None
European Search Report from European Patent Application No. 03250012.6, 4 pages, mailed Mar. 26, 2003.
Choy, C.S. et al., “A Low Power-Noise Output Driver with an Adaptive Characteristic Applicable to a Wide Range of Loading Conditions,”IEEE Journal of Solid-State Circuits, vol. 32, No. 6, pp. 913-917 (Jun. 1997).
Huchzermeier, J., “Sauber und schnell schalten Dynamic Output Control ermöglicht verbesserte Schalteigenschaften bei hohen Geschwindigkeiten,”Electronik, vol. 48, N . 20, pp. 50-54, 56 and 58 (Oct. 5, 1999).
CMOS Integrated Circuits, B-Series, Solid State Scientific, Inc., pp. 16-17 (Nov. 1976).
Broadcom Corporation
Sterne Kessler Goldstein & Fox PLLC
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