Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1982-05-06
1984-11-06
Griffin, Robert L.
Pulse or digital communications
Spread spectrum
Direct sequence
370100, H04L 704
Patent
active
044816472
ABSTRACT:
An input apparatus for a logic analyzer is disclosed which receives a plurality of logic signals from a probe, the plurality of logic signals being received at different points in time, the input apparatus being capable of generating a corresponding plurality of logic signals in response thereto, the time of generation of the corresponding plurality of logic signals substantially coinciding with the time of generation of a corresponding reference logic signal. The input apparatus comprises a plurality of tapped delay lines corresponding to the plurality of received logic signals. A controller controls the amount of time delay for each delay line associated with each received logic signal. The controller continues this control function until the time of generation of the corresponding plurality of logic signals substantially coincides with the time of generation of the corresponding reference logic signal. The controller provides the control function by comparing the time of receipt of one of the plurality of logic signals with the time of receipt of a reference logic signal and controlling the amount of time delay of the associated delay line until the time of generation of the corresponding logic signal substantially coincides with the time of generation of the corresponding reference logic signal.
REFERENCES:
patent: 3118111 (1964-01-01), Miller
patent: 3204228 (1965-08-01), Eckert, Jr.
patent: 3327299 (1967-06-01), Johnson
patent: 3660647 (1972-05-01), Pryor, Jr.
patent: 3961270 (1976-06-01), Ullmann et al.
patent: 4218654 (1980-08-01), Ogawa et al.
Gombert Glenn J.
Palmquist Steven R.
Bouchard John H.
Chin Stephen
Griffin Robert L.
Tektronix Inc.
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