Browse Prior Art Database

Space Transformer for Use in an Electronic Test System

IP.com Disclosure Number: IPCOM000081903D
Original Publication Date: 1974-Aug-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 82K

Publishing Venue

IBM

Related People

Bove, R: AUTHOR [+3]

Abstract

The space transformer depicted in the drawing may be used in conjunction with a buckling beam probe structure of the type disclosed in U. S. Patent No. 3,806,861. The transformer structure provides an easily expandable AC contacting system. The space transformer transforms electrical connections from the tester, which are relatively spaciously spaced, to the highly dense array of electrical contacts of a probe structure. The probe structure electrical contacts may be spaced on a grid of 0.25 mm centers. The AC environment of the electrical paths within the space transformer are controlled in this construction.

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Space Transformer for Use in an Electronic Test System

The space transformer depicted in the drawing may be used in conjunction with a buckling beam probe structure of the type disclosed in U. S. Patent No. 3,806,861. The transformer structure provides an easily expandable AC contacting system. The space transformer transforms electrical connections from the tester, which are relatively spaciously spaced, to the highly dense array of electrical contacts of a probe structure. The probe structure electrical contacts may be spaced on a grid of 0.25 mm centers. The AC environment of the electrical paths within the space transformer are controlled in this construction.

Referring to Fig. 1, the space transformer is composed of several multilayered printed-circuit boards 1. To obtain the desired AC characteristics, each board is fabricated to have a signal line pattern 2, dielectric planes 3 and a ground plane 4. The boards 1 are sandwiched together to provide stripline transmission characteristics, whereby constant impedance is obtained. A typical signal line land pattern is shown in Fig. 2, and illustrates spaciously spaced signal lines 2 transformed in spacing. As seen from Fig. 1, where the lines are closely spaced, conductive wires 5 are bonded to the signal lines 2. The wires 5 are fed through the space transformer die 7, potted with epoxy 8 and the lower surface of the space transformer is ground planar. The ends of wires 5 are plated at 9 for good contact resist...