Electronics > RF, Microwave, Ham Radio

What to use for an array of very high Q resonators?

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mawyatt:
Another technique for creating very high "Q" tunable filters were called Commutating Filters. They are based upon commutating a set of "N" simple RC Low Pass Filters with switches that cycle thru the "N" RC LPFs at a clock rate Ck. This produces a net resultant narrow bandpass filter at frequency Ck/N, with a 3dB bandwidth of 2*LPF/N, and can produce exceptionally high filter "Qs".  We utilized this technique way back in ~1980 to find and isolate specific "tones" at MW frequencies.

Best,

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