[time-nuts] filtering a 10Mhz frequency standard?

[Timeok]

see also:
http://www.timeok.it/files/10_mhz_bandpass_filter.pdf
--
Luciano P. S. Paramithiotti
IZ5JHJ


--------- Original Message --------
From: Discussion of precise time and frequency measurement
<time-nuts at febo.com>
To: Discussion of precise time and frequency measurement
<time-nuts at febo.com>
Subject: Re: [time-nuts] filtering a 10Mhz frequency standard?
Date: Dec 13, 2011 10:29 PM

> If you are going to buffer the output, why does the filter have to be 
> passive? Did I miss something here? Today 10MHz is in the realm of 
> active filters. [Hey, not that I made an active filter at 10MHz.]
> 
> Sensitivity is a function of the denominator. The only advantage to a 
> LPF over a BPF is the BPF has to be centered at 10MHz, while you could 
> bump the corner of the LPF to a higher frequency so there is less 
> sensitivity at 10MHz This presumes you are only getting rid of harmonics 
> and not spurs.
> 
> For lowest component sensitivity, leap frog designs are best. But in 
> continuous time designs, they require many op amps per pole.
> 
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