Most of us never think about the workings of the electronic devices use everyday. The ubiquitous integrated circuit finds a place in so many appliances across the board, that it's no longer a source of wonder. However, we mustn't forget the true miracle of this important component. For the overwhelming majority of us in our modern world, our lives revolve around the electronic chip. The circuits that make up electronic devices are probably some of the most complex networks known to man. Regular failure analysis of these electronic circuits is crucial to ensuring that they maintain their current levels of reliability. In fact, there's no doubt that the sophisticated levels of testing which are applied to modern electronic chips are largely responsible for their phenomenal success.

Many things can go wrong with an integrated circuit. In this article, we look at the ways and means by which we detect errors in the circuitry. These failures are particularly difficult to diagnose and localize because of the complex interactions by which the errors manifest themselves. The symptom of failure in the electronics might show itself somewhere down the line rather than actual the physical location where it's caused. Because of this, it requires a highly experienced and professional failure analyst to effectively uncover these issues and problems.

Failure Analysis of Electronic Circuits

Infrared thermography is the failure analysis technique which is used for detecting flaws in electronic circuitry. It's based around the principle that incorrectly performing circuits give off an unusual amount of heat. Do to the small currents involved, this extra heat needs to be detected using an extremely sensitive process. For this, we can use either liquid crystals or florescent micro thermal imaging.

It was something like this. A small amount of liquid crystal is spread along the area where the error is suspected to have occurred. It is applied in as thin a layer as possible. We can do this by rotating the chip quickly and allow the centrifugal force to spread it out. Once we have applied the liquid with the desired consistency, we can fire up the circuit. The liquid crystals have been designed in such a way that a certain amount of heat at a particular point will render it opaque. This can be picked up by sensitive instruments and we can isolate the heat producing element.

Florescent imaging, is almost the same except that instead of providing a single spot of heat, we can produce instead a heat map. It's more complicated, but diverges more useful information for the failure analysis of electronic circuits. These are just some of the methods which failure analysis engineers use to isolate faults in integrated circuit circuitry. And it is methods such as this which work under the hood to provide us with the current levels of durability that we have come to expect from our electronics today.

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