Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Current driver
Reexamination Certificate
2001-03-29
2002-04-09
Ton, My-Trang Nu (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Current driver
C327S087000
Reexamination Certificate
active
06369621
ABSTRACT:
FIELD OF THE INVENTION
The present invention is generally related to differential driver circuits, and more particularly to fast LVDS drivers including those having stringent short-to-ground requirements.
BACKGROUND OF THE INVENTION
The next generation low voltage differential signaling (LVDS) transceiver parts being developed are the high speed LVDS repeater type, such as PECL/ECL to LVDS converter type. These transceivers are configured to receive a differential input signal and drive a TIA/EIA-644 compliant LVDS signal. There are several high speed LVDS repeater parts currently on the market, but none which is fully TIA/EIA-644 compliant. The chief technical problem with a high speed repeater (up to 1.36 GBps) is to reduce the rise/fall times into the range in which the maximum speed requirement can be adequately met. Existing TIA/EIA-644 compliant drivers are typically current mode differential drivers which are limited by their architecture to around 600 MBps. Existing Gigibit speed repeaters are generally not TIA/EIA-644 compliant.
Moreover, the high speed repeaters currently on the market do not conform to the short-to-ground requirements called out in the TLA/EIA-644 specification, and therefore are not truly LVDS compatible.
There is desired a Gigibit fast LVDS driver which limits output current for shorts-to-ground.
SUMMARY OF THE INVENTION
The present invention achieves technical advantage as a Gigabit fast LVDS transceiver (
50
) which also limits output current for shorts to ground. The circuit acts to both detect and limit the current in the voltage reference portion of the output. A methodology is used to detect and limit the current which provides a significant improvement in performance over the prior art. The fast LVDS transceiver is particularly adapted to be fully TIA/EIA-644 compliant.
REFERENCES:
patent: 5617046 (1997-04-01), Palara et al.
patent: 5793239 (1998-08-01), Kovacs et al.
patent: 5796276 (1998-08-01), Phillips et al.
patent: 6111431 (2000-08-01), Estrada
patent: 6201421 (2001-03-01), Takeuchi et al.
patent: 6252440 (2001-06-01), Sushihara et al.
patent: 6313662 (2001-11-01), Ide
Carvajal Fernando D.
Tinsley Steven J.
Brady W. James
Nu Ton My-Trang
Swayze, Jr. W. Daniel
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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