[time-nuts] notch filter for close in phase noise measurement
adrian.rus at broadhurst.ro
Sun Oct 2 12:48:27 EDT 2016
Your point is correct. I shall revert with numbers. Indeed, there are plenty of limitations. The intrinsic Cristal noise and the behaviour of the crystal under large signal are among the most worrisome.
It was incorrect opose the methode (at all) against the other known methodes.
Sent from my BlackBerry 10 smartphone on the Orange network.
From: Chuck Harris
Sent: Sunday, October 2, 2016 19:40
To: Discussion of precise time and frequency measurement
Reply To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] notch filter for close in phase noise measurement
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?
Adrian Rus wrote:
> 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.
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