What is a controlled impedance line? For one thing, the term has to do with Printed Circuit Board (PCB) traces and layouts, which get more complex with higher frequency signals. Generally, you need not worry much about controlling impedance in traces unless you are working with signals at or above 50 MHz. However, most of […]
Chest-mounted electronics do a more accurate job of counting heart beats than do optical sensors on the wrist. That’s one of the conclusions to come out of a close look at this sport watch aimed at runners. Leland Teschler Executive Editor A sport watch from Garmin called the Forerunner 220 is basically a runner’s watch […]
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By Roger Allan, contributing writer There’s good news for power supply system designers. Silicon-based power devices are making performance advances in diode, transistor, and field-effect transistor (FET) functions….