mcdonald@aries.scs.uiuc.edu (Doug McDonald) (04/30/91)
I'm looking to see if someone sells some reasonable approximation to an electrical filter network I need. I know perfectly well how to kludge one together, but is a mess involving several delay lines (I would use lengths of coax.) What I need is a filter with a time response that is about 30 nanoseconds wide FWHM and has either a rectangular time response (or a reasonable trapeziodal approximation) or a Gaussian response. Anybody have any ideas? Doug McDonald (mcdonald@aries.scs.uiuc.edu)
whit@milton.u.washington.edu (John Whitmore) (05/01/91)
In article <1991Apr30.003318.12397@ux1.cso.uiuc.edu> mcdonald@aries.scs.uiuc.edu (Doug McDonald) writes: >What I need is a filter with a time response that is about 30 >nanoseconds wide FWHM and has either a rectangular time response >(or a reasonable trapeziodal approximation) or a Gaussian response. Depending on what bandwidth you want, perhaps you should consider a multi-tap delay line? Terminate it correctly, and just sum over 30 ns worth of taps (with appropriate buffering so your taps aren't loaded). The LCB030Z100, from Allen Avionics, is a 100-ohm delay line with 20 equal-spaced taps, good for 120 MHz bandwidth. Allen Avionics (516) 248-8080 Other manufacturers may have something similar (Hey, I just opened the EEM and flipped to the delay lines section... and AA was first.). Hope this helps. John Whitmore