Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!dali.cs.montana.edu!milton!whit
From: whit@milton.u.washington.edu (John Whitmore)
Newsgroups: sci.electronics
Subject: Re: odd filter wanted
Message-ID: <1991Apr30.232437.9223@milton.u.washington.edu>
Date: 30 Apr 91 23:24:37 GMT
References: <1991Apr30.003318.12397@ux1.cso.uiuc.edu>
Organization: University of Washington, Seattle
Lines: 21

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