CEM3374

[Don Tillman]

   From: "Bjorn Wesen" <bjorn at sparta.lu.se>
   Date: Sun, 26 Oct 1997 13:46:13 +0100

   Sorry my ignorance, but what is the "desired quirk" of an analog VCO that
   would keep one from using a digital dito? I mean, it's easy to make
   something in an FPGA that produces bitstream modulated waveforms, then you'd
   feed that into a lowpass to get the analog waveform back. It would be much
   more expensive than a pre-built chip of course, but you'd loose problems
   like temperature drift.

There really is no "desired quirk" with analog VCOs, but there are
numerous "undesired quirks" of digital VCOs.  

How is your "easy FPGA" going to handle aliasing issues due to the
waveform and aliasing issues due to FM modulation?

   There already exist plenty of digital oscillator chips

Which are these?

  -- Don