Method and apparatus for increasing operating frequency of a system for testing electronic devices
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United States of America Patent
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-
Feb 1, 2011
Grant Date -
Dec 11, 2008
app pub date -
Aug 19, 2008
filing date -
Jan 7, 2005
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A test system includes a communications channel that terminals in a probe, which contacts an input terminal of an electronic device to be tested. A resistor is connected between the communications channel near the probe and ground. The resistor reduces the input resistance of the terminal and thereby reduces the rise and fall times of the input terminal. The channel may be terminated in a branch having multiple paths in which each path is terminated with a probe for contacting a terminal on electronic devices to be tested. Isolation resistors are included in the branches to prevent a fault at one input terminal from propagating to the other input terminals. A shunt resistor is provided in each branch, which reduces the input resistance of the terminal and thereby reduces the rise and fall times of the input terminal. The shunt resistor may also be sized to reduce, minimize, or eliminate signal reflections back up the channel.
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