Patent ID: 6265948
Filing Date: 2001-07-24
Classification: H04L

Abstract:
An image suppressing continuous phase frequency shift keying modulator, comprising:a logic-based numerically controlled oscillator adapted to alter an output frequency of an output digital signal based on an input data symbol; anda first logic-based mixer to upconvert an in-phase component of said output digital signal output from said numerically controlled oscillator to a first intermediate frequency signal by mixing with a quadrature phase component of a system clock;a second logic-based mixer to upconvert a quadrature phase component of said output digital signal output from said numerically controlled oscillator to a second intermediate frequency signal by mixing with an in-phase component of said system clock; andcombinatorial means for combining said first intermediate frequency signal and said second intermediate frequency signal to selectively reject an undesired sideband and produce a single modulated output signal at a desired intermediate frequency sideband.