Patent ID: 6605989
Filing Date: 2003-08-12
Classification: H03D

Abstract:
An FM demodulator using a single input signal apparatus, comprising:a first I-Q splitter with a constant group delay apparatus receiving the input signal to generate a first in phase output signal and a first quadrature output signal; a second I-Q splitter with a constant group delay apparatus receiving said first in phase output signal to generate a second in phase output signal and a second quadrature output signal; a first multiplier stage receiving said first in phase output signal and said second quadrature output signal to generate a first output signal; a second multiplier stage receiving said first quadrature output signal and said second in phase output signal to generate a second output signal; a differential stage receiving said first output signal and said second output signal to generate a third output signal; and a low pass filter receiving said third output signal to generate a demodulated signal.