Circuitry for synchronizing a multiple channel circuit tester
 Quickly synchronizing adjustable delay circuits for a multiple channel tester by using a timing pulse that has reached the end of a given path in the tester to trigger the following timing pulse of a timing generator, thereby providing oscillating timing pulses having an associated frequency related to the propagation delay associated with the particular path, comparing the associated frequency with a reference frequency and adjusting a delay provided in the path until the associated frequency matches a desired frequency. 
Teradyne, Inc.
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H03K G01R H03K
inventional inventional inventional
Jacqueline N. Joseph F. Lawrence Jiann-Neng
Brenner Wrinn Heller Chen