Electronic digital logic circuitry – Reliability – Fail-safe
Reexamination Certificate
2005-08-09
2005-08-09
Chang, Daniel D. (Department: 2819)
Electronic digital logic circuitry
Reliability
Fail-safe
C326S083000, C327S545000
Reexamination Certificate
active
06927599
ABSTRACT:
A system and method are described for receiving differential currents in a current mode circuit. When conditions occur where the receiver inputs are floating, undriven, shorted together, or one or both shorted to ground, the output of the system remains stable. Diode connected MOS transistors receive the unequal currents, and current mirrors amplify the received currents. Those amplified mirrored currents are differentially amplified and converted into voltage signals suitable of typical computer and logic systems. The current mode differential nature of the invention provides high common mode current and voltage noise immunity. A threshold for the unequal currents helps provide high differential current and voltage noise immunity.
REFERENCES:
patent: 6288577 (2001-09-01), Wong
patent: 6320406 (2001-11-01), Morgan et al.
patent: 6650149 (2003-11-01), Wong
patent: 03242035 (1991-10-01), None
patent: 11295354 (1999-10-01), None
patent: 2002257869 (2000-09-01), None
Texas Instruments Incorporated, SN65LVDS32B, SN65LVDT32B, SN65LVDS3486B, SN65LVDT3486B, SN65LVDDS9637B, SN65LVDT9637B High-Speed Differential Receivers, Oct. 2000 SLLS440A Product Reference, Revised May 2001, pp. 1-19.
MAXIM, Low-Jitter, 800Mbps, 10-Port LVDS Repeaters with 100Ω Drive, Application Notes for the MAX9153/MAX9154, Revised Oct. 2001, pp. 1-11.
Gingerich, Kevin, Wired-Logic Signaling With M-LVDS: High Performance Linear-Interface, Application Report SLLA119 for Texas Instruments, dated Oct. 2002, pp. 1-14.
International Search Report and the Written Opinion of the International Searching Authority for International Application No. PCT/US2004/037144, dated Mar. 9, 2005.
Ju Jianhong
Pradhan Pravas
Cesari and McKenna LLP
Chang Daniel D.
Fairchild Semiconductor Corporation
Paul, Esq. Edwin H.
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