Eye diagram analyzer correctly samples low dv/dt voltages

Details Eye diagram analyzer correctly samples low dv/dt voltages Eye diagram analyzer correctly samples low dv/dt voltages

2005-05-31

2005-05-31

Tsai, Carol S. (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Electrical signal parameter measurement system

C331S00100A

Reexamination Certificate

active

06901339

ABSTRACT:
A sampling transition-detector sets two latches to different values when an input signal comparator referenced to the selected voltage transitions during a sample interval: at the beginning one latch receives one comparison value while at the end the other latch receives an opposite comparison value. A difference (XOR) in latched values indicates a transition through the selected voltage during the sample interval. An additional latch is set by a second input signal comparator whose reference voltage is offset slightly from the selected voltage, It also clocked at the start of the sample interval. If the two latches clocked at the start of the sample interval are different, as indicated by another XOR, then the input was between the reference voltage and its offset counterpart. The OR of the two XORs is the desired indication.

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