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Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?

To: Craig Freeman who wrote (68591)	8/12/1999 1:21:00 AM
From: Bill Jackson	Read Replies (2) \| Respond to of 1579107

Craig, I suspect they use tantalum electrolytics here and there on the MOBO with some ceramic plate caps close in and the multilayer board helps too. After all at 600 Mhz when a surge starts it stops half a clock later. In addition they have some caps right on the CPU(in many fast designs), real close to the action. If all the cap[acitance was at the power supply the lead inductance and resistance would never react in time to feed such a load and you would have a logic dropout as the local rail voltage cratered. In fact you can use this to make a very short pulse with two rails that differ by say 1" are fed with identical short pulses, one + the other - and where they meet you have a oscillator that runs until the voltage dies. So it gets voltage for the distance differential of 1" times the propagation velocity along the trace. Not long. pulse train is very short. Used for very short range radar that penetrates walls and dry ground. www.llnl.gov under micropower pulse radar if you are interested. Bill