Electronic digital logic circuitry – Interface – Current driving
Reexamination Certificate
2002-03-27
2003-07-08
Tokar, Michael (Department: 2819)
Electronic digital logic circuitry
Interface
Current driving
C326S030000, C326S083000, C326S082000, C327S108000, C327S087000, C327S067000, C330S253000, C330S258000, C341S156000, C341S159000
Reexamination Certificate
active
06590422
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to low voltage differential signaling (LVDS) structures.
2. Description of the Related Art
LVDS is a data signaling technology that provides differential current signals for high-rate data transmission. Because noise is generally equally coupled onto differential signal paths, it is substantially rejected by a remote receiver which differentially receives the LVDS signals. Accordingly, LVDS differential transmission is less susceptible to common-mode noise than typical single-ended transmission techniques. Because LVDS drivers generate low-level differential current signals, their power consumption is reduced from conventional single-ended transmission systems and is almost flat regardless of the data rate.
LVDS technology is currently standardized in the ANSI/TIA/EIA-644 Standard of the Telecommunications Industry Association/Electronics Industries Association (TIA/EIA) and in the IEEE 1596.3 Standard of the Institute for Electrical and Electronics Engineering (IEEE).
Although its low-noise, low-power characteristics make LVDS particularly suited for driving remote receivers, currently-available LVDS systems generally fail to provide means to easily accommodate different loads and readily realize selected differential currents and voltages with these loads while still maintaining a standardized common-mode level.
BRIEF SUMMARY OF THE INVENTION
The present invention is directed to LVDS drivers and analog-to-digital (ADC) systems which facilitate easy alteration (e.g., replacement of a selectable resistor R
sel
) of differential current levels and differential voltages in response to altered loads. In addition, these drivers and systems maintain common-mode levels in the loads which are unaffected by alterations in the loads and their associated differential current and voltage levels. These features are realized with feedback signals from high-resistance feedback resistors that are coupled across LVDS circuit bridges.
REFERENCES:
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patent: 5977796 (1999-11-01), Gabara
patent: 6005438 (1999-12-01), Shing
patent: 6111431 (2000-08-01), Estrada
patent: 6246262 (2001-06-01), Morgan et al.
patent: 6369621 (2002-04-01), Tinsley et al.
patent: 6404374 (2002-06-01), Yu et al.
Jordanger, Rick, “A Comparison of LinBiCMOS and CMOS Process Technology in LVDS Integrated Circuits”, Texas Instruments, Application Report SLLA065, Mar. 2000.
Analog Devices Inc.
Koppel, Jacobs Patrick & Heybl
Tan Vibol
Tokar Michael
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