Eye opening monitor

Details Eye opening monitor Eye opening monitor

1982-04-30

1984-05-15

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 52, 375 76, 329112, H03K 1332

Patent

active

044492235

ABSTRACT:
An eye opening monitor for a binary waveform such as provided as the video output of a demodulator. At the decision sample time, the video is compared to -V.sub.th and +V.sub.th reference voltages to determine if it falls in the range defined therebetween. If it does, a counter is reset. Because the carry-out pulses of the counter are used to produce -V.sub.th and +V.sub.th, the range defined therebetween is decreased by the additional time required to count to the carry-out after the counter is reset. The loop stabilizes with the range from -V.sub.th and +V.sub.th being quantitatively indicative of the eye opening. A voltage derived from V.sub.th is visually displayed.

REFERENCES:
patent: 3214700 (1965-10-01), Hook
patent: 3225213 (1965-12-01), Hinrichs
patent: 3509279 (1970-04-01), Martin
patent: 4034340 (1977-07-01), Sant' Agostino

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