[time-nuts] notch filter for close in phase noise measurement

Chuck Harris cfharris at erols.com
Sun Oct 2 12:38:27 EDT 2016


Simple is nice, but if we cannot talk about the limitations
that come about because of the simplicity, without causing
offense, how can we ever know if simple is good enough?

-Chuck Harris

Adrian Rus wrote:
> Rick,
> Why hunt goose with the cannon? The post is about a simple(r) crystal notch filter, nothing more and nothing less. It is not about notch filters (in general) against quadrature method, nor about number of RF components or about their noise floor limitation.
> It is about this notch filter against other notch filters.
> As per simplicity, to mix 2 oscillators in quadrature one need the second oscillator, the high level mixer, the PLL and the baseband (FFT) analyzer.
> Best,
> Adrian

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