Difference: WaferTesting (5 vs. 6)

Revision 62011-11-03 - AndrewBlue

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Descriprtion of the water testing of ASICS at Glasgow

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The setup uses a Cascade semi automatic probe station, with a custom built probe card. The probe card is connected to a PCB driver card, which sends signals and data to and from the PC. 2 NI cards are used for signalling, voltage sourced for power, multimeters for measuring the DACs and an adapted verstion of SCTDAQ is used for control software

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Hardware

TTi TSX	TTi CPX 2000	Agilent 34401A	Agilent 34401A

2.5V for ABCn

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Meter for ABCn multiplexer ouput

Meter for monitoring output of the ABCn analogue regulator

Driver Card

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Connections

2 64 pin twist & flat cables

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- To 2nd multimeter

Probe Card

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The custom cantilever epoxy probe card, made by Rucker and Kolls, Milpitas, CA, has 122 probes.

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The card has also been shortened to minimize the trace lengths and all LVDS pairs are terminated with 100 ohm resistors at the probe ring.

Probe Station

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Cascade Microtech model S300 probe station
The machine, which has a 12” chuck, can accommodate the 8” ABCN-25 wafers.

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Software

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Root 5,26
Visual Studio Express 2008

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For a chip to be considered as good, it must have no more than one bad (dead, stuck or untrimmable) channel.

Instructions

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In root, .x Wafter.cpp
Loads STGUI.cpp

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If 3 Digital fails in a row, wafer testing will fail

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