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Disclosed is a structure that makes it possible to determine which capacitors, in an array of capacitors connected in parallel on a multichip computer module, are electrically open.
English (United States)
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Capacitor With Integrated Rc Network for Multichip Modules
Disclosed is a structure that makes it possible to determine which capacitors,
in an array of capacitors connected in parallel on a multichip computer module,
are electrically open.
Arrays of capacitors are used to reduce power supply noise on multichip
computer modules. To determine which capacitors, if any, are electrically open,
a series RC network may be integrated into each capacitor. When the module
voltage distribution network is driven by a high-frequency current source, power
is dissipated only in the RC networks of those capacitors that are electrically
connected. A thermal image of the module reveals which capacitors are not
heated up and thus electrically open.
The figure shows the plate construction of a parallel plate capacitor. The
plate is modified, through removal of conductor or material composition, to have
a region of high resistance. At the end of this high resistance region is a small
conductor area that forms a capacitor. The high resistance region forms the
resistor of the RC network and the small conductor area forms the capacitor of
the RC network. The RC network is in parallel with the capacitance of the
unmodified plate area. The plate is electrically connected to the appropriate
power supply of the module through the tab.