[sdiy] Ring Mod (was Re: Hadamard Transform Network)

[Neil Johnson]

Hi Tom,

> Let me summarise from last time we had this conversation: strictly 4-quadrant multipliers aren't "ring mods", but many people use "ring mod" universally to apply to both. This is either sloppy and incorrect usage, or a widening of the definition of the term depending on your point of view.

Or more precisely:
  4-quadrant modulators are a type of product modulator
  ring modulators are a type of product modulators
  4-quadrant modulators are not ring modulators

For the best performance out of a ring modulator you need to drive it
with a very good bipolar square wave to minimise unwanted sidebands.

Neil
-- 
http://www.njohnson.co.uk