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EET Stuff: EMI, XOBX CPU's, etc..


I haven’t done this in a while, but here are some cool documents:

Lost Link Bandwidth – How to get it Back

Link bandwidth can be a slippery animal. Without careful thought on the front end of the design, attenuation, reflections and system noise can quickly turn a planned 10 Gbits/s link into one with a much less throughput. With a thoughtful approach to the entire signal path and inclusion of well-chosen equalization techniques coupled with extensive simulation, much of the bandwidth can be regained before it has a chance to disappear.

The impact of signal reflections: Part 2 in the series on lost-link bandwidth

Reflections in the net are the most difficult signal perturbations to control in an interface. Line losses can be managed through a combination of transmit and receive equalization techniques. Crosstalk and skew can be managed through good routing practices and careful connector selection and pin out.

EMI from the Ground Up: DM and CM noise in Switching Power Supplies

Now we turn our attention to a real power supply to see for ourselves where all the buzz is really coming from. First consider what would happen if the input bulk capacitor of the power supply had been a perfect capacitor: i.e. with zero effective series resistance (ESR)

EMI from the Ground Up: Maxwell to CISPR

Sooner or later, every power supply designer finds this out for himself —- that if anything has the potential to cause a return to the drawing board at the very last moment, it is either a thermal issue, a safety related issue, or a stubborn EMI problem.

Low on-resistance, one key for the perfect switch

The following discusses the key parameters of CMOS analog switches, their benefits and their suitability in many diverse applications. While no switch is perfect for all applications, a perfect switch can be found for every application.

EMI Effects on Board-Level Designs Part 2 – Measurements and Limits of Conducted EMI

We will stick to the conventional descriptions and definitions, before we talk about the differences that arise when applying these concepts to power conversion. Conducted emissions fall into two basic categories: Differential mode (DM), also called symmetric mode or normal mode and Common mode (CM), also called asymmetric mode or ground leakage mode.

EMI Effects on Board-Level Designs Part 3 – Safety concerns for practical EMI line filters

We can now look at a typical power supply line filter shown in Figure 2_1. Its overall purpose is to control conducted emissions, and therefore it has two stages (as highlighted) —- one for differential mode and one for common mode. Let us make some observations

IBM in, Intel out of Xbox?

IBM and Microsoft announced a technology sharing agreement that one analyst said could result in IBM providing the processor silicon for Microsoft’s next-generation game platform, displacing Intel from the Xbox 2.