The Automated Test Blog

Embedded.com recently published an article by an engineer at On Semiconductor about their use of PXI and LabVIEW for the characterization benches.  In the article, Ray Morgan describes the benefits of this system over previous approaches, saying, among other things that “the PXI platform set a new standard for semiconductor design validation, breaking many of the paradigms and constraints of previous testing methodologies”.

I found the article particularly inersting as it articulates some common challenges I’ve been seeing in semiconductor characterization that I believe PXI and LabVIEW are very well-suited to solve.  We are, in fact, seeing a major uptick in the use of these platforms in applications such as these.  Another technolgy that I believe will be important in these applications is the user-programmable FPGA.  I discussed this trend in a previous post on Protocol Aware ATE.

As recently discussed in a post by Rick Nelson of Test and Measurement World magazine, the Semiconductor Test Consortium (STC) has begun work on defining a Portable Test Instrument Module (PTIM) – a standard plug-in module for performing ancillary measurements on existing semiconductor ATE.  My colleague, Luke Schreier, delivered a presentation at the last STC global meeting that was very well-received which proposed PXI as a suitable specification to build from.   The business case is very compelling – traditional ATE architectures are built to accommodate the densest and highest speed test pins possible – 1 kilowatt of power per board is not uncommon.  This is necessary for the high speed digital electronics needed to test the latest processors, for instance.  When you need to add some audio or RF measurements into the system, however, the infrastructure can be overkill.  Moreover, to fully integrate an instrument into a tester requires expertise of the ATE vendor, so to make these measurements, the vendor may be required to invest significantly in development of measuement functionality already available on the open market, just in other form factors.

It is interesting to me that the semiconductor test industry is recognizing some of the features we designed into the original PXI specification.  In fact, one of the slides we used to use in the early days of PXI showed a set of rack and stack instruments on one side and a “big iron” semiconductor tester on the other, with PXI right in the middle.  The point was that PXI borrowedconcepts from both of these markets – the measurement quality from box instruments, and the card modular form factor and integrated timing and synchronization from semiconductor ATE.  It looks like after 10 years, its finally come full circle.

I was recently invited to give a talk at the VLSI Test Symposium titled “Migration of PXI Instruments into Semiconductor Test“. The session focused on emerging trends in semiconductor ATE and on work that is currently going on in both vendors consortia, to migrate PXI into semiconductor test applications. The presentation covered the key challenges currently facing engineers that are validating and testing increasingly complex devices such as SoCs and SiPs. As I previously blogged, Protocol Aware ATE is a new technique for testing these complex devices at a system level. In the presentation, I also covered existing work to build semiconductor ATE based on PXI, including examples of augmenting existing ATE, creating testers with a PXI measurement core, and work by the Semiconductor Test Consortium on a Portable Test Instrument Module, or PTIM. The PTIM initiative is designed to provide a way to add ancillary measurement capability to existing ATE platforms. The STC has been evaluating various options and has the desire to standardize PTIM on an exiting industry standard. PXI has been proposed as the PTIM platform and is currently being discussed at the Global STC Conference this week in San Diego. This proposal will enable ATE customers and vendors to leverage the large commercial investment in PXI and extend ATE capability by using the 1500 existing PXI modules currently available.