Monthly Archives: November 2012

Crest Factors for QAM Signals

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?

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

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