It depends on what kind of accuracy you need.

You could do this analog wise by building a filter that has fast cutoff and
linear phase in the passband, and then
applying a very short pulse to it.

A bessel filter is easy to design and has somewhat this characteristic.
Better would be a phase compensated chebeshev design, but I don't think you
will find that in a table!

If you look at these filter's responses with an oscilloscope, they will look
very Sinc like.

Cliff



wrote in message
ups.com...
Dear All,
I want to synthesize a SINC wave with main lobe width = 100ns,
Is it possible to use a LC filter response or
a DDS or a similar approach mey be?
Can anyone help me?
Thanks