First realize that VHDL has nothing to do to your question. Neither do the
FPGAs. Your question probably belongs to the comp.dsp newsgroup, but before
you post it there I would recommend you to do some more homework.

/Mikhail


"viswanath" <daita@eng.usf.edu> wrote in message
news:791e9679.0405171229.4a846cc5@posting.google.com...
> Hi,
> I have to design a low pass filter in VHDL. How can one go about
> designing such a filter when the medium is event driven and time
> domain based??
> How should one decide on the filter characteristics if we just know
> the symbol time rate.
> If I am using standard VHDL and not AMS is it possible for me to
> design such a filter which is used in the recovery loops of receiver?
> Most of the references on filter and digital communications refer to
> frequency domain analysis. How can I go around this problem?
> If the input is a pulse then a low pass filter is an integrate and
> dump. However if I have a sampled sine wave how could I design a low
> pass filter? Could you please reply and let me know?
> I would grealty appreciate your reply.
> Looking forward to your replies,
> Thanks
> Viswanath
> PS: I would be needing a filter after the mixing of two sine waves to
> filter out the higher frequency components

Hi, 
I have to design a low pass filter in VHDL. How can one go about
designing such a filter when the medium is event driven and time
domain based??
How should one decide on the filter characteristics if we just know
the symbol time rate.
If I am using standard VHDL and not AMS is it possible for me to
design such a filter which is used in the recovery loops of receiver?
Most of the references on filter and digital communications refer to
frequency domain analysis. How can I go around this problem?
If the input is a pulse then a low pass filter is an integrate and
dump. However if I have a sampled sine wave how could I design a low
pass filter? Could you please reply and let me know?
I would grealty appreciate your reply. 
Looking forward to your replies,
Thanks
Viswanath
PS: I would be needing a filter after the mixing of two sine waves to
filter out the higher frequency components