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From: cdc@uafhcx.uucp (C. D. Covington)
Newsgroups: comp.dsp
Subject: Re: Hilbert Transformer
Message-ID: <4837@uafhp.uark.edu>
Date: 27 Jun 90 20:19:27 GMT
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> >     I would say the analog version would be difficult to come by.  
> 
> Not quite. There is a simple (and, very insensitive to component 
> tolerances) iterative method in the analog world for successively 
> approximating quadrature shifts known as a Phase Sequence Filter.  

     I really haven't done much with phase shifting in the analog world.  The
point I was making was that you would have to constrain the bandwidth in some
way.  I guess that's what you mean by 'iterative', perhaps a ladder of some
kind.
                                                d. covington