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May 2006
Permittivity, Permeability, Loss Tangent of some Materials
Friday, 26 May 2006 8:33 P GMT-06
I while ago I found a very interesting source describing the measurement of the permittivity, permeability, and loss tangent of some common microwave materials. Digging around a little from this URL, I found the base site for Pbar.
Category: High Speed Digital Design
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Digital Controlled Power Supplies
Friday, 26 May 2006 8:16 P GMT-06
I saw an article in the recent issue of EDN magazine talking about digitally controlled power supplies. In most digital systems there are many different voltage levels needed for different parts. For example on a recent design I worked on
Category: Digital System Architecture
Slew Rate in High Speed Digital Communication Systems
Thursday, 18 May 2006 8:43 P GMT-06
Normally in high speed digital design we think in terms of rise time of signals. A closely related parameter is slew rate, the maximum rate of change of a voltage signal with respect to time. One commonly used rule of thumb for relating r
Category: High Speed Digital Design
Air Products and Chemicals (APD)
Thursday, 18 May 2006 6:14 A GMT-06
I came across this company in an article on the Yahoo Finance site. The article described the importance of water as a resource over the next 20 years. Air Products and Chemicals was listed as a company that provides products in the waste
Category: Nanotechnology Investing
Free Technical Books Available on the Web
Saturday, 6 May 2006 7:59 P GMT-06
A site called FreeTechBooks contains links to many free technically oriented books. The books can be downloaded or viewed online. There are many books on computer programming and software engineering. There are also quite a few math
Sonicare Toothbrush and Inductive Charging
Friday, 5 May 2006 8:47 P GMT-06
I recently started using a Philips Sonicare Toothbrush. The first time I went to charge it I noticed that there was no metal contacts between the charger and the toothbrush. This toothbrush is charged through inductive charging. Bas
Category: Energy
SI Time Synchronous Logic Timing Source
Tuesday, 2 May 2006 8:20 P GMT-06
Synchronous digital logic requires a clock signal. Clocks can be generated by any circuit that has a time constant such as a simple RC circuit with some driving stimulus and conditioning. Traditionally, the best quality clocks in terms of
Category: Digital System Architecture