Pulse or digital communications – Cable systems and components
Patent
1997-02-10
1999-01-05
Chan, Jason
Pulse or digital communications
Cable systems and components
375285, 375296, 455114, 455115, 332159, 332123, H04N 710
Patent
active
058570012
ABSTRACT:
A digital data waveform precompensated for off-chip cable attenuation includes peaks with exponential tails at signal transitions. A driver output stage generating the waveform includes an output transistor pulling the output to a peak voltage level when an input goes high. After a delay, a transistor closes a feedback loop containing a resistive load, exponentially changing the voltage level of the output to a final voltage level. A complementary output transistor pulls the output to a ground voltage level when the input goes low, with a transistor closing a feedback loop containing a resistive load for exponential change of the output to a final voltage level. The separate resistive paths equalize the time constant of the exponential tails despite a difference in the gate capacitances of the output transistors. The received waveform after cable attenuation exhibits pulse shapes closer to the predefined pulse shapes on which a receiver is designed to operate.
REFERENCES:
patent: 3980826 (1976-09-01), Widmer
patent: 5058131 (1991-10-01), Thacker
patent: 5204880 (1993-04-01), Wurster et al.
patent: 5253272 (1993-10-01), Jaeger et al.
patent: 5263049 (1993-11-01), Wincn et al.
patent: 5299230 (1994-03-01), Jaeger et al.
Cecchi Delbert Raymond
Preuss Curtis Walter
Chan Jason
Dillon Andrew J.
International Business Machines - Corporation
Tran Congvan
Venglarik Daniel E.
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