[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
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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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