Electrical transmission or interconnection systems – With nonswitching means responsive to external nonelectrical... – Temperature responsive
Patent
1990-03-15
1991-09-17
Heyman, John S.
Electrical transmission or interconnection systems
With nonswitching means responsive to external nonelectrical...
Temperature responsive
307518, 328 55, 328133, 377 20, 377 56, H03K 514, H03K 5153
Patent
active
050497669
ABSTRACT:
In a delay measuring circuit (10), an input clock signal (13) is applied to a multitapped delay line (14), the output taps of which are connected to a switch (26) which selects one of the switch inputs for connection to a phase comparator (34) which compares the input clock signal (13), delayed in a delay device (38) to compensate for the delay inherent in the switch (26), with the output of the switch (26). The input clock signal is also applied to a counter (22), and when the phase comparator (34) detects a phase match, the counter value is stored in a latch (32), the counter (22) is reset to a predetermined value, and the counting procedure resumed. The latch (32) thus always stores a value dependent on the delay of an individual delay cell (16-l to 16-N). This stored value can be applied to various uses, such as in a timing watchdog circuit or for generating accurate delays.
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Kruithof Richard
van Bokhorst Hendrik
van Driest Hans
Hawk Jr. Wilbert
Heyman John S.
Jewett Stephen F.
NCR Corporation
Sessler Jr. Albert L.
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