[SI-LIST] Re: [!! SPAM] Re: Quick switch

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
>>>> Please do not print this email unless it is absolutely necessary.
>>>>
>>>> The information contained in this electronic message and any attachments 
>>>> to this message are intended for the exclusive use of the addressee(s) 
>>>> and may contain proprietary, confidential or privileged information. If 
>>>> you are not the intended recipient, you should not disseminate, 
>>>> distribute or copy this e-mail. Please notify the sender immediately and 
>>>> destroy all copies of this message and any attachments.
>>>>
>>>> WARNING: Computer viruses can be transmitted via email. The recipient 
>>>> should check this email and any attachments for the presence of viruses. 
>>>> The company accepts no liability for any damage caused by any virus 
>>>> transmitted by this email.
>>>>
>>>> www.wipro.com
>>>>
>>>> ------------------------------------------------------------------
>>>> To unsubscribe from si-list:
>>>> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>>>>
>>>> or to administer your membership from a web page, go to:
>>>> http://www.freelists.org/webpage/si-list
>>>>
>>>> For help:
>>>> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>>>>
>>>>
>>>> List technical documents are available at:
>>>>                 http://www.si-list.net
>>>>
>>>> List archives are viewable at:
>>>> http://www.freelists.org/archives/si-list
>>>> or at our remote archives:
>>>> http://groups.yahoo.com/group/si-list/messages
>>>> Old (prior to June 6, 2001) list archives are viewable at:
>>>>  http://www.qsl.net/wb6tpu
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>         
>>>
>>>       
>> ------------------------------------------------------------------
>> To unsubscribe from si-list:
>> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>>
>> or to administer your membership from a web page, go to:
>> http://www.freelists.org/webpage/si-list
>>
>> For help:
>> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>>
>>
>> List technical documents are available at:
>>                http://www.si-list.net
>>
>> List archives are viewable at:
>> http://www.freelists.org/archives/si-list
>> or at our remote archives:
>> http://groups.yahoo.com/group/si-list/messages
>> Old (prior to June 6, 2001) list archives are viewable at:
>>  http://www.qsl.net/wb6tpu
>>
>>
>>     
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
> or to administer your membership from a web page, go to:
> http://www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
>
> List technical documents are available at:
>                 http://www.si-list.net
>
> List archives are viewable at:     
>               http://www.freelists.org/archives/si-list
> or at our remote archives:
>               http://groups.yahoo.com/group/si-list/messages
> Old (prior to June 6, 2001) list archives are viewable at:
>               http://www.qsl.net/wb6tpu
>   
>
> .
>
>   


------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field


List technical documents are available at:
                http://www.si-list.net

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu

Other related posts: