[sdiy] Through-Zero FM

[Don Tillman]

   > From: Tim Parkhurst <tparkhurst at siliconbandwidth.com>
   > Date: Thu, 16 Dec 2004 15:31:21 -0800
   > 
   > So I'm looking at JH's site (looking for a picture where someone
   > had made a nifty little PCB for use with SMT tempcos... I thought
   > it was JH), and I see he has several VCOs with "Thru-Zero" FM
   > capability. I've seen this term bandied about before (especially
   > with respect to frequency shifters), but I've got to admit I
   > don't really understand what it is or why it would be
   > useful. Anyone care to enlighten me?

See my article:

    "A Quadrature Trapezoid Voltage Controlled Oscillator"
    http://www.till.com/articles/QuadTrapVCO/index.html

  -- Don

-- 
Don Tillman
Palo Alto, California
don at till.com
http://www.till.com