Patent ID: 6240142
Filing Date: 2001-05-29
Classification: H03C,H03D,H04L

Abstract:
A quadrature modulator comprising:a first quadrature splitter for receiving a first sinusoid and providing a first inphase sinusoid and a first quadrature sinusoid;a second quadrature splitter for receiving a second sinusoid and providing a second inphase sinusoid and a second quadrature sinusoid;a first mixer connected to said first quadrature splitter for receiving said first inphase sinusoid, said first mixer also receiving a first data signal and providing a first modulated signal;a second mixer connected to said first quadrature splitter for receiving said first quadrature sinusoid, said second mixer also receiving a second data signal and providing a second modulated signal;a third mixer connected to said first quadrature splitter for receiving said first quadrature sinusoid, said third mixer also receiving said first data signal and providing a third modulated signal;a fourth mixer connected to said first quadrature splitter for receiving said first inphase sinusoid, said fourth mixer also receiving said second data signal and providing a fourth modulated signal;a first summer connected to said first and second mixers;a second summer connected to said third and fourth mixers, and connected to subtract an output from said fourth mixer from an output of said third mixer;a fifth mixer connected to said first summer and to said second quadrature splitter, said fifth mixer receiving said second inphase sinusoid and providing a fifth modulated signal;a sixth mixer connected to said second summer and to said second quadrature splitter, said sixth mixer receiving said second quadrature sinusoid and providing a sixth modulated signal; anda third summer connected to said fifth and sixth mixers, said third summer providing a resultant modulated signal.