Passive redundant digital data receiver with schmitt-trigger

Details Passive redundant digital data receiver with schmitt-trigger Passive redundant digital data receiver with schmitt-trigger

2006-06-27

2006-06-27

Bayard, Emmanuel (Department: 2611)

Pulse or digital communications

Receivers

C375S257000, C375S350000, C375S229000, C375S285000, C379S386000, C379S159000, C327S036000, C327S020000, C324S166000, C455S021000, C333S118000, C174S250000

Reexamination Certificate

active

07068734

ABSTRACT:
A passive coupling structure constructed using printed circuit board traces is used to separate the low and high frequency components of an incoming digital signal. The low and high frequency components of the signal are sent to separate receivers on an integrated circuit. The low frequency receiver may be a conventional level based receiver. The high frequency receiver is a Schmitt-trigger with hysteresis around a DC level or two comparators with separate reference voltages. The outputs of these receivers are combined to produce a receiver output that has increased reliability and noise immunity.

REFERENCES:
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patent: 4868872 (1989-09-01), Roberts et al.
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patent: 2003/0221863 (2003-12-01), Marshall et al.
patent: 2004/0066860 (2004-04-01), Bois et al.
“Schmitt trigger”; http://en/wikipedia.org/wiki/Schmitt—trigger; “Schmitt trigger—Wikipedia, the free encyclopedia”; pp. 1-2.
“Comparator”; http://en/wikipedia.org/wiki/Comparator; “Comparator—Wikipedia, the free encyclopedia”; p. 1.
“Hysteresis and the Schmitt Trigger”; http://www.ee.ttu.edu/lab/robot/hyster.htm; pp. 1-3.
Lancaster et al. (CMOS Cookbook; Schmitt Triggers; pp. 265-to-269; 2nd, Edition; 1992).

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