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

paul swed paulswedb at gmail.com
Wed Dec 14 10:02:16 EST 2011


Boy thats nice and simple. Shame I juts placed a order for parts could have
added a few 10.7 xformers to the order.

On Wed, Dec 14, 2011 at 9:55 AM, Timeok <timeok at timeok.it> wrote:

> 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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