US 6,586,960 B2Granted

Measuring device for testing unpacked chips

AssigneeInfineon Technologies AG

InventorsBernd Klehn, Bernhard Knuepfer

Life of this patent

Estimating the term…

Loading patent…

Abstract

A measuring device has a needle-board circuit board carrying a large number of contact-making needles for contacting connecting areas on an IC circuit. The measuring device has lines for feeding test signals at a high clock frequency to the contact-making needles, and for carrying measured signals away from the contact-making needles. The needles have a shank part with a length L2 and a tip part 14 adjacent thereto with a length L1. For optimally transmitting signals in terms of impedance, the lines are formed as dual-transmission conductor tracks, the shank parts of the contact-making needles each contact a section of the conductor tracks, and the overall length of the contact-making needles satisfies: L1+L2<λ/2, where λ is the maximum wavelength of the signal that is transmitted via a respective line.

Claims13

Dependent claims

A measuring device for testing unpacked chips, comprising:

a needle-board circuit board carrying a plurality of contact-making needles for making contact with connecting areas on an IC circuit;
said needle-board circuit board having lines for feeding test signals having a clock frequency that is at least in a megahertz range to said plurality of said contact-making needles, said lines also for carrying measured signals away from said plurality of said contact-making needles;
each one of said plurality of said contact-making needles including a shank part having a length l2 and a tip part having a length l1, said tip part being adjacent said shank part;
each one of said lines having a section making contact with said shank part of a respective one of said plurality of said contact-making needles;
said lines being formed as dual-transmission conductor tracks on said needle-board circuit board;
each one of said plurality of said contact-making needles having an overall length such that l1+l2<λ/2;
and
λ being a maximum wavelength of a signal transmitted via a respective one of said lines.

5 more elements

Dependencies are inferred from the claim text.