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September 08, 2011


John Dunn

SPICE was nowhere around during the described events, Mark.

The entire process was based on measurmeents (the resistance readings), observations (current waveforms) and discussions with Motorola, RCA and among ourselves.

Joel Koltner

When it comes to digital logic gates, it's only in fairly recent times that some manufacturers have begun specifying *minimum* propagation delays... and yet there are many designs in existence that rely on some certain (often unknown) minimum delay, and it's then not uncommon to see these designs fail when die shrinks case the gates to be faster.

I am in full agreement with the idea that one needs to be close attention to data sheet specs, perform simulations, etc., but in the real world sometimes your design choices are to use a part relying on an unspecified parameter (such as minimum propagation time) or else be forced to add so much additional circuitry so as to make a product inviable.

And keep in mind that while SPICE is a great tool, it's a very uncommon SPICE model that accurately models *all* corners of a device's behavior properly! (Go check out some of your favorite op-amp models some time -- many of them will happily exceed their power supply voltages at their outputs...)

Barton Wilson

It is true that companies, especially semi-conductor companies, will not be able to replicate the make of a product in the course of time. But there is always room for improvement. That is why a lot of semi-conductor companies adapt to innovation and embrace new systems. This development will help create new products that will pass the standards of their stakeholders, clients, and consumers.

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