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Politics : Formerly About Advanced Micro Devices
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To: Bill Jackson who wrote (82278)12/7/1999 10:13:00 PM
From: Elmer  Read Replies (2) of 1576132
 
Re: "Mani, You could probably use Ohm's law. After all with more than 20 million transistors they will not all go on at the same time and then off with the clock so you will get an avaeraged effect and I bet if you hooked up a gigahertz scope to the part you would not see anything more than a little grass that represents the power supply surges of those nanosecond transitions that are all averaged out. Since it all ends up as ohmic heating I think you would be within 1% of the truth. The calorimetric method you suggest would be less accurate and would take more time and would be used for heat sink designs to see what it steady states at for different speeds and voltages. A series of experiments in a test jug with a special on chip thermal probe would probably be used for this."

Bill this is all nonsense. If you are going to produce 20Million (AMD) to 100Million (Intel) Processors a year how are you going to guarantee the power dissipation to your customers and do it in the same test you are using to guarantee processor operation and performance and you only have a few seconds to do all of it? Answer: you're going to average the current and compare it to the Icc spec published in your data sheet. That's what you guarantee because that's the only way you can measure it in a production environment. We'd all love to hook up scopes but just try it on 100 million parts and see if you meet your quotas. Modern testers average current.

EP
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