Harris Semiconductor actually made these chips, to control the power factor,
or something like this, around 10 to 12 years ago.  I remember them, because
I had some samples and was looking at building some motor control circuits,
but they did not handle 3 phase motors at the time.

They must have dropped it because  search turns up nothing.  I might still
have the data sheet hiding someplace.  I'll look for it sometime this month
or next.


And, I was looking for the data sheets for it, and did come across quite a
few interesting app notes on some stuff ppl have been discussing...


                                Current Feedback Amplifier Theory and
Applications
   AN9621


                                Crystal Filter Yields Pure Sine Waves (1
page) AN9815

   AN9334
                 HA7210
                                Improving Start-up Time at 32kHz for the
HA7210 Low
                                Power Crystal Oscillator

   AN9513
                 HFA1103
                                Component Video Sync Formats
   AN9514
                 HFA1103
                                Video Amplifier with Sync Stripper and DC
Restore


                                Derive Pure Sine Waves From Digital Signals
(2 pages)
                                AN9780
   AN9787
                                An Intuitive Approach to Understanding
Current Feedback
                                Amplifiers (4 pages) AN9787


  Linear Tech Briefs

   TB334
                 Packaging,
                 (General Logic)
                               Guidelines for Soldering Surface Mount
Components to
                               PC Boards