Comparator with application in data communication

Details Comparator with application in data communication Comparator with application in data communication

1992-06-23

1995-01-31

Wambach, Margaret Rose

Communications: electrical

Digital comparator systems

330258, 330259, 327 67, 327 65, 327513, 327545, G06F 702

Patent

active

053862074

ABSTRACT:
A comparator that may be used in data communications transmission lines, in particular, an Ethernet Twisted-Pair line. The comparator accepts as input the differential voltage from the transmission lines. The comparator uses feedback circuitry to monitor particular voltages within the comparator and adjust them as necessary to mitigate the effect of bias offset within the comparator that may result from, for instance, temperature driven device parameter variations. The comparator also minimizes the effect of power supply noise. The feedback circuitry ensures that as the comparator input differential voltage approaches zero (i.e., when the comparator outputs should switch from a high voltage to a low voltage or vice versa), the input of a comparator output amplifier is situated in the middle of the high gain region of the output amplifier, ready to quickly trigger switching of the comparator output when the comparator input differential voltage crosses zero volts. In one embodiment, the feedback circuitry comprises an operational amplifier and two resistive-capacitive structures.

REFERENCES:
patent: 4105942 (1978-08-01), Henry
patent: 5008632 (1991-04-01), Sutterlin
patent: 5077496 (1991-12-01), Wolczanski
patent: 5187448 (1993-02-01), Brooks et al.

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