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Article #10270Re: A question about the Nyquist theorm
From: Bob Jewett
Date: Tue, 19 Feb 1991 21:44
Date: Tue, 19 Feb 1991 21:44
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1087 bytes
> > Just to nit-pick, it should be "GREATER then twice the bandwidth of the > > signal", not twice the highest frequency. > > Wow, that's great! So I only need to sample my 10 Hz bandwidth signal > which is centered at 1 MHz at 20 Hz! Yes, that's almost true. You also have to worry about how quickly the sidebands and unwanted signals roll off, and about folding the components of the signal of interest on top of each other. The same considerations apply to standard IF mixers as well. A practical sampled system with margins might be: center of IF = 1MHz+50Hz, sampling rate = 200Hz. This could be done with crystal filters. Bob
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!sdd.hp.com!hplabs!hpl-opus!jewett From: jewett@hpl-opus.hpl.hp.com (Bob Jewett) Newsgroups: sci.electronics Subject: Re: A question about the Nyquist theorm Message-ID: <65200009@hpl-opus.hpl.hp.com> Date: 19 Feb 91 21:44:23 GMT References: <91046.095459F0O@psuvm.psu.edu> Organization: HP Labs, High Speed Electronics Dept., Palo Alto, CA Lines: 14