Monthly Archives: November 2012

Crest Factors for QAM Signals

Posted on 26-November-2012 by mathscinotes

Quote of the Day If you want to succeed you should strike out on new paths, rather than travel the worn paths of accepted success. — John D. Rockefeller Introduction I need to do a quick calculation of the Crest … Continue reading →

Posted in Electronics | 22 Comments

Trapezoids Better Than Sinusoids?

Posted on 22-November-2012 by mathscinotes

Sinusoids hold a revered place in electrical engineering -- they should. However, I do encounter quite a few trapezoids in telecom power systems. During a meeting the other day, I was asked "Why do we use trapezoidal waveforms for Alternating Current (AC) signals like ringer voltages and remote power systems." It was a good question. I have written about the trapezoidal waveform before, but I have never explained why the trapezoid is used so frequently. Continue reading →

Posted in Electronics | 7 Comments

Design Review of Four Transistor Current Source

Posted on 20-November-2012 by mathscinotes

One of the engineer's in my group asked if I had any information on how a four transistor current source works. I decided that to pull together a quick Mathcad worksheet. The Wikipedia refers to this current source configuration as … Continue reading →

Posted in Electronics | 3 Comments