Electronics for communication engineers by John Markus; Vin Zeluff; Electronics

By John Markus; Vin Zeluff; Electronics

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They learn quickly enough though! One common use for wirewound resistors seems to be as the load for a converter. I also use that configuration when doing thermals to simulate the customer’s system and for noise and ripple measurements. But rarely do I use it for anything else. I would strongly suggest you get yourself a good electronic load. But do remember to set it to CC mode (constant current mode). Because a resistor (or an electronic load set to CR mode) is just too benign. For example, rarely does it reveal any fundamental start-up issues.

Only to discover they were embarrassingly wrong to start with? And that could have happened for any of the following equally impressive reasons; a) the handwriting was almost illegible, b) the formula was missing a factor of 2, c) the units were wrong, d) the math manipulation went awry when we transferred the terms to the other side of the equality sign, or e) you wrote 20% tolerance where you actually meant ±20%, that is, a 40% tolerance band. In 2005 it became grindingly obvious that there was a certain spot on Seattle’s monorail where tram cars trying to simply pass each other by had to stop to take samples of exterior paint from each other.

Depending upon where the offending PCB section is located, we could get voltage spikes being applied to the pins of the IC. This could affect pin thresholds and cause erratic behavior. For example, if the IC has a clock pin, this could produce severe jitter in the switching waveform, which in turn could produce other measurable effects. The good thing is that these inductive spikes usually do not have much associated energy, and therefore tend to get absorbed partially by real or parasitic capacitances nearby and/or get dissipated in adjacent resistances.

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