# Category Archives: Electronics

## Schmitt Trigger Design Math

Introduction I have a home project that requires me to design a Schmitt trigger circuit. There are numerous places on the web where you can find design equations for the Schmitt trigger constructed using an open-drain comparator. Unfortunately, these design … Continue reading

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## Mathcad Solution to an LVPECL to LVDS Matching Problem

Introduction A circuit question walked into my cube the other day. An engineer in another group was working his way through an application note and he found the presentation unclear — I agreed with him. The application note provided an … Continue reading

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## Rigging Cables is Really Important

I have been rather frustrated lately with the number of field failures I have encountered that are related to the humble cable tie (Figure 1 – Source). There are several problems related to cable ties. They are easy to over-tighten … Continue reading

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## Example of Error Calibration

Introduction I was reviewing a test report today for an optical receiver with an integrated power measurement sensor. This sensor is not particularly accurate — its accuracy was specified as within ± 3 dB of true. This is not good … Continue reading

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## A PCB Thermal Computation Example

Introduction I am doing some self-training on electronic thermal analysis. As part of my self-training ritual, I often work through vendor application notes. This post will show how I work through an application note using Mathcad. You might think that … Continue reading

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## Australian Phone Line Impedance Math

Introduction I am doing some work with international phone circuits and I noticed that the Australian government has test procedures that model the characteristic impedance of the phone line using a resistor/capacitor circuit (see Figure 1). In the US, we … Continue reading

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## An Example of Misusing Thermal Resistances

In my previous post, I provided some definitions of thermal resistances and thermal characteristics. In this post, I want to show the problem that got me interested in this subject. An engineer misused the numbers and got answers that did … Continue reading

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## Compact Thermal Models for Electrical Components

Introduction I am an electrical engineer and not a mechanical engineer. As such, I depend on electronic packaging professionals to provide me answers to my thermal questions at work. However, I am curious about how the packaging folks estimate the … Continue reading

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## Determining the Bandwidth of A Pulse

Introduction I was reading an article in PhotonicsSpectra magazine about the use of a laser radar system to assist pilots in detecting wires while flying low and I saw two commonly used bandwidth estimation formulas that most engineers do not … Continue reading

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## Another Glamour Shot from the World of Engineering

Things are starting to get cold now in Minnesota and all nature’s creatures are looking for a nice warm place to stay for the winter — including me. Today’s photo shows a frog who found one of my optical network … Continue reading

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