Quadrature detection in FM

Quadrature detection of FM signals is a well known technique that has been used for a number of years. It uses phase shifting and multiplication of signals to detect FM modulation. A recent whitepaper by the techteam at Signal Processing Group Inc., describes this type of detection and presents an analysis for the more technically minded. The paper can be accessed at the "Engineer's Corner", in the SPG website located at http://www.signalpro.biz.