I'm sure there are some readers who know more about this than I do, but
I haven't seen any responses. So I'll post what I know.

A Sinc wave is a non-causal waveform. That means that it starts before
the excitation impulse. A perfect sinc wave starts at t = minus
infinity, reaches its peak at t = 0, and extends to t = plus infinity.
So only a truncated or windowed wave of some sort is possible. But even
a truncated one is non-causal. That means you can't make it from any
kind of passive components like an LC filter -- you need some sort of delay.

I think the only way you'll be able to generate even a truncated or
windowed wave is with a digital filter. I believe an IIR (infinite
impulse response) as opposed to FIR (finite impulse response) will be
necessary, but I'm not terribly well acquainted with digital filtering
techniques so will have to defer to others on that point. The filter
would look something like ones used in digital signal processing (DSP),
so you might look at references dealing with DSP for some clues.

Roy Lewallen, W7EL

wrote:
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