Abstract: An apparatus and method is provided of recovering a frequency modulated signal having a first component of the frequency modulated signal at a zero-RF spectral location and a second component of the frequency modulated signal at a zero-RF spectral location in quadrature relationship to the first component. The method includes the steps of: upconverting and summing the first and second components to produce a reference signal (100), time delaying the first and second components, upconverting and summing the delayed, upconverted first and second components to produce a delayed reference signal (101) in quadrature relationship to the reference signal; limiting the reference and delayed signal (102); and exclusive or-ing (103) the limited reference and limited delayed signal.