Madhu Siddalingaiah is an independent consultant for developing wireless, embedded and enterprise systems. He has authored several books and delivered more than 100 presentations at conferences and organizations worldwide. He received a BS in physics from the University of Maryland, College Park, Md. Email address: madhu@madhu.com
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June 7, 2007[Ideas For Design] Use Current-Mirror Biasing To Avoid Squegging In RF Oscillators
If you've ever designed an RF oscillator, you've probably encountered squegging. Sometimes called "motor boating," squegging causes oscillators to start and stop at frequencies much lower than the frequency of interest. Viewed on an oscilloscope, squegging looks like bursts of oscillations. On a spectrum analyzer, it looks like a Christmas tree. In some designs, such as super-regenerative receivers or wildlife radio tags, this might be a desirable side effect. In most cases,...
