Browse Prior Art Database

Programmable Reference Plane

IP.com Disclosure Number: IPCOM000039959D
Original Publication Date: 1987-Aug-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Mello, AA: AUTHOR

Abstract

A programmable reference plane (PRP) permits any input/output (I/O) pin on a substrate/module to be individually connected to the reference plane for testing purposes. The PRP works in the following manner. The PRP consists of a thin copper plate 1 (Fig. 1) containing multiple drilled holes 2 into which removable pin sockets 3 (Fig. 2) are inserted. All the drilled holes 2 in the copper plate 1 are filled with pin sockets 3 so that all the substrate/module I/O pins will be electrically shorted to the reference plane. The shorting action takes place due to the construction of the pin socket 3. As shown in Fig.

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Programmable Reference Plane

A programmable reference plane (PRP) permits any input/output (I/O) pin on a substrate/module to be individually connected to the reference plane for testing purposes. The PRP works in the following manner. The PRP consists of a thin copper plate 1 (Fig. 1) containing multiple drilled holes 2 into which removable pin sockets 3 (Fig. 2) are inserted. All the drilled holes 2 in the copper plate 1 are filled with pin sockets 3 so that all the substrate/module I/O pins will be electrically shorted to the reference plane. The shorting action takes place due to the construction of the pin socket 3. As shown in Fig. 2,

(Image Omitted)

the pin socket 3 has a continuous spring contact 4 which makes electrical contact to the I/O pin (not shown) on the inside of the socket 3 and also makes electrical contact between the outside of the socket 3 and the inside of the holes 2 (Fig. 2) within the copper plate 1 (Fig. 1). When a measurement of a signal line of a substrate/module is to be made, the pin socket is physically removed from the PRP. Because the pin socket is no longer shorting out the I/O pin, measurement equipment can now be connected between the I/O pin and the reference plane and a measurement can be taken. Measurements can be made to determine the resistance, breakdown voltage, capacitance, and inductance between the I/O pin and the reference plane. The number of I/O pins and which I/O pins are to be electrically shorted to the reference plane are programmable. They can easily be changed by simply inserting or removing sockets into or from the copper plane. This flexible configuration permits capacitance measurements of signal lines which have layout connections between them. When the standard substrate/module capacitance measurement fixtures are used, all the signal lines, except th...