[SI-LIST] Re: [!! SPAM] Re: Quick switch
- From: Scott McMorrow <scott@xxxxxxxxxxxxx>
- To: Mikhail Matusov <matusov@xxxxxxxxxxxx>
- Date: Fri, 30 May 2008 10:47:30 -0400
Yes, that is much better than the older designs. However, if you'll
look at the spec, crosstalk from one differential switch to another is
4.5%. With 3 aggressor switches, total crosstalk can still be above 10%
@ 250MHz.
Scott McMorrow
Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
(401) 284-1827 Business
(401) 284-1840 Fax
http://www.teraspeed.com
Teraspeed® is the registered service mark of
Teraspeed Consulting Group LLC
Mikhail Matusov wrote:
> Scott,
>
> There are some switches designed for the purpose with good grounding. One
> example is Pericom PI3L301D, which I believe is a copycat of a TI device
> with a similar part number...
>
>
> =======================
> Mikhail Matusov
> Senior Hardware Design Engineer
> Square Peg Communications
> Tel.: +1 (613) 271-0044 ext.231
> Fax: +1 (613) 271-3007
> http://www.squarepeg.ca
>
>
>
>
> ----- Original Message -----
> From: "Scott McMorrow" <scott@xxxxxxxxxxxxx>
> To: "steve weir" <weirsi@xxxxxxxxxx>
> Cc: <ravi.potana@xxxxxxxxx>; <si-list@xxxxxxxxxxxxx>
> Sent: Friday, May 30, 2008 9:19 AM
> Subject: [SI-LIST] Re: Quick switch
>
>
>
>> Ravi
>> To follow on with what Steve has said, most FET switch packages do not
>> have adequate package grounding. Since the substrate is normally
>> grounded, this poses a problem, since there is parasitic capacitive
>> coupling between each switch and the substrate. These are fairly easy
>> devices to model in SPICE, and many manufacturers provide accurate
>> models. IBIS models, however, cannot adequately model these devices.
>>
>> regards,
>>
>> Scott
>>
>> Scott McMorrow
>> Teraspeed Consulting Group LLC
>> 121 North River Drive
>> Narragansett, RI 02882
>> (401) 284-1827 Business
>> (401) 284-1840 Fax
>>
>> http://www.teraspeed.com
>>
>> Teraspeed® is the registered service mark of
>> Teraspeed Consulting Group LLC
>>
>>
>>
>> steve weir wrote:
>>
>>> An NFET or CMOS switch in a package has parasitics like any other
>>> device. If you model and work within the limitations of those
>>> parasitics you shouldn't have any unwelcome surprises. If you pretend
>>> that the device is without parasitics you can easily make designs that
>>> run into problems.
>>>
>>> Steve
>>> ravi.potana@xxxxxxxxx wrote:
>>>
>>>
>>>> Hello All,
>>>>
>>>> Please let me know if anyone has used Quick switch (FET based) on clock
>>>> with frequency 125MHz for muxing operations and seeing any SI issues on
>>>> the clock line after passing through the FET Switch.
>>>>
>>>> regards
>>>> Ravi
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>>>>
>>>
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