Category Archives: Filter

A notch filter for phase noise measurment

Posted on 1 February, 2015 by Thomas S. Knutsen

Measuring phase noise is difficult, due to the large difference between the signal and the noise.  Here I will outline the method I use to determine the noise of a oscillator and show the basic bandpass – notch filter used … Continue reading →

Posted in Filter, Phase Noise, Uncategorized | Leave a comment

Any benefit to grounding crystal cases?

Posted on 9 December, 2014 by Thomas S. Knutsen

An while ago, I was asked about if there was any benefit to ground the crystal case when using them in ladder filters. I provided an quite simplified analysis and a VNA picture. After some more thinking about it I … Continue reading →

Posted in Crystal, Filter, VNA | Leave a comment