"Current Source"

This quarterly, subscriber-based newsletter is delivered in print version to Speeding Edge customers. The newsletter is an an adjunct to "Right the First Time, A Practical Handbook on High Speed PCB Design." The newsletter was created as a result of a number of requests for additional information as well as questions regarding some of the technical information contained in the book. The issues of the newsletters are designed to be 'living' documents placed in three ring binders that are readily on hand at designer's and engineer's desks.

Summary of Current Source-Volume 3- Issue 1

• What constitutes a differential pair and how does it operate.
• When and why are differential pairs used; and why differential pairs are not used for all digital signal paths.
• Length matching and choosing terminating resistor values.
• AC coupling capacitors -- their operation; their size and when they are needed; how they should be placed, whether they cause signal degradation and whether there are any downsides to adding them to a differential pair.
• Tightly coupling differential pairs is discussed followed by how differential pairs should be routed and where do return currents flow.
• Broadside routing of differential pairs and why it is a bad idea.
• Power delivery requirements of differential pairs; linear vs. switching power supplies and the use of separate Serdes supplies.
• Commonly-held myths that surround differential signaling including whether routing vias cause signal degradation in differential paths and if right-angle bends cause signal integrity problems with high-speed differential pairs.
• The future of differential pairs; a discourse on the new sources of signal integrity problems that may arise as differential speeds increase; and summaries of design rules that do and don't apply to differential signals routed in a PCB.

Pricing and Availability

"Current Source" is available now. It is offered as a subscription for $60 per year or $20 per issue. A special promotion is being offered at $130 for "Right the First Time" and a "Current Source" subscription through the end of 2004. This can be purchased directly off of the company´s website, by fax at 707-568-3504 or by telephone at 707-568-3983.

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