[SI-LIST] Re: Recommendation for high-speed digital input pro tection?
- From: Geoff Stokes <gstokes@xxxxxxxxx>
- To: "'si-list@xxxxxxxxxxxxx'" <si-list@xxxxxxxxxxxxx>
- Date: Mon, 21 Jul 2003 10:12:43 +0100
Roman (or is this from Mr Nicholls?)
I think if you have an input connection carrying such a fast signal, it
should be correctly terminated in say 50 to 100 ohms direct to ground. ESD
is then no problem. [You might want to protect against lightning, but at
high frequencies that requires a spark device.] You cannot add any
component with significant capacitance to a broadband (untuned) signal, as
you can't usually tune it out, except maybe produce some peaking near the
band edge with a series inductance.
Is the signal a 1.8GHz clocked logic signal? Or does it have some amplitude
modulation?
Geoff
> -----Original Message-----
> From: Bart Bouma [mailto:bart.bouma@xxxxxxxxx]
> Sent: 21 July 2003 08:09
> To: Roman.PRAGER@xxxxxxxxxxxxxx
> Cc: jpnicholls@xxxxxxxx; si-list@xxxxxxxxxxxxx;
> si-list-bounce@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: Recommendation for high-speed digital input
> protection?
>
>
> You might take a look at Califirnia Microdevices.
> They have high speed emi/esd protection filters.
> www.calmicro.com
> bart bouma
>
> ================================================
>
>
>
> Have a look for "antenna guard" from AVX. Maybe this is
> something for you
>
> Roman
>
> ---
> Roman Prager
> FREQUENTIS
> Hardware Development ATC
> A- 1120 Wien, Spittelbreitengasse 34
> Roman.Prager@xxxxxxxxxxxxxx
> Tel. +43/1/81150- 2763=20
> Fax +43/1/81150- 1601
>
>
> >>> "JP Nicholls" <jpnicholls@xxxxxxxx> 07/10/03 04:30pm >>>
> si-list Digest V3 #183
> We have a fast digital connection (1.8Gbps) which is going =20
> to the front panel of a unit. The connection is direct to an FPGA.
> Such "outside world" Connectors are usually protected against =20
> ESD using transorbs or zener diodes on the input lines. At =20
> these gigabit speeds, zeners become capacitors and will distort the =
> signal.
>
> Can anyone recommend a suitable input protection scheme, or =20
> any particular manufacturers products?
>
> Many thanks,
>
> --
> JP Nicholls / jpnicholls@xxxxxxxx=20
>
> Digital Design Engineer
>
> Powerwave UK Ltd
> Embassy House
> Queen's Avenue
> Bristol, BS8 1SB
> United Kingdom
>
>
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