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Fused Decoupling Capacitor With Test Electrode

IP.com Disclosure Number: IPCOM000034692D
Original Publication Date: 1989-Apr-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 2 page(s) / 64K

Publishing Venue

IBM

Related People

Zalesski, A: AUTHOR

Abstract

A test electrode allows the detecting of decoupling capacitors having open fuses soldered in parallel with many other capacitors on a printed circuit board. The fused decoupling capacitor with a test electrode is described in the following. (Image Omitted) The fused decoupling capacitor (Fig. 1) with test electrode consists of capacitors Cl and C2, and a fuse built in an enclosure. One electrode of each capacitor is connected to the fuse. The decoupling capacitor can be commoned with the electrode of the two capacitors. Capacitor Cl is used as a decoupling capacitor. Capacitor C2 is used only for sensing decoupling capacitors with open fuses connected in parallel in large arrays. Capacitance C2 can be much lower than the decoupling capacitance of Cl.

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Fused Decoupling Capacitor With Test Electrode

A test electrode allows the detecting of decoupling capacitors having open fuses soldered in parallel with many other capacitors on a printed circuit board. The fused decoupling capacitor with a test electrode is described in the following.

(Image Omitted)

The fused decoupling capacitor (Fig. 1) with test electrode consists of capacitors Cl and C2, and a fuse built in an enclosure. One electrode of each capacitor is connected to the fuse. The decoupling capacitor can be commoned with the electrode of the two capacitors. Capacitor Cl is used as a decoupling capacitor. Capacitor C2 is used only for sensing decoupling capacitors with open fuses connected in parallel in large arrays. Capacitance C2 can be much lower than the decoupling capacitance of Cl. When AC voltage is applied to the capacitance array, the capacitors with open fuses can be detected by measuring the AC voltage between test electrodes T (Fig. 2) and electrode A, to which capacitor fuses are connected. This voltage is significantly higher for capacitors with open fuses than for capacitors with good fuses. There are several ways the test electrode can be introduced, such as metallizing an appropriate surface of the capacitor which will develop the highest sense signal. One implementation of this technique is accomplished using fused tantalum capacitors. The fuses are connected to the decoupling capacitor electrode which is placed under the surface of the...