[SI-LIST] Re: Quick switch

  • From: "Mikhail Matusov" <matusov@xxxxxxxxxxxx>
  • To: <si-list@xxxxxxxxxxxxx>
  • Date: Fri, 30 May 2008 09:55:04 -0400

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
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> http://www.teraspeed.com
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> Teraspeed® is the registered service mark of
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>
>
> 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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