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From: mbutts@mentor.com (Mike Butts)
Newsgroups: rec.ham-radio,sci.electronics
Subject: Re: New cheap 200 kHz ADC: good for digital receiver?
Message-ID: <1989Sep19.172521.1722@mentor.com>
Date: 19 Sep 89 17:25:21 GMT
References: <1989Sep19.171259.1670@mentor.com>
Organization: engr
Lines: 26

From article <1989Sep19.171259.1670@mentor.com>, by mbutts@mentor.com (Mike Butts):
> Imagine how fast, cheap ADCs and DSPs could cause a revolution in receiver
> design (especially when we get cheap ADCs and DSPs that can handle several
> MHz IFs, and direct digital synth chips to match):
> 
>   Antenna ---> Mixer ---> LPF/gain --> ADC -----> DSP -----> DAC -----> audio
>                  ^                                |
>                  |                                |
>               DDSynth                             \------> data
> 
> A few real RF stages + cheap digital VLSI = high-performance receiver?

If one takes this one step further, to a time of 80 MHz wide dynamic range ADC
chips (2000? 2010?):

   Antenna ---> LPF/gain --> ADC -----> DSP -----> DAC -----> audio
                                         |
                                         |
                                         \------> data

To heck with superhet, just digitize the HF band and process from there!
-- 
Michael Butts, Research Engineer       KC7IT           503-626-1302
Mentor Graphics Corp., 8500 SW Creekside Place, Beaverton, OR 97005
!{sequent,tessi,apollo}!mntgfx!mbutts         mbutts@pdx.MENTOR.COM
Opinions are my own, not necessarily those of Mentor Graphics Corp.