Title :
Digital quadrature IF modulator using single-bit DACs
Author :
Huang, Ruimin ; Ling, Chaodong ; Wang, Jiaxian
Author_Institution :
Sch. of Inf. Sci. & Eng., Huaqiao Univ., Xiamen, China
Abstract :
This paper introduces a quadrature intermediate frequency modulator implemented digitally by two digital sigma delta modulators (DSDMs). The output bit streams from in-phase (I) and quadrature (Q) modulators are combined by a multiplexer similar to the Gilbert-cell structure. This novel structure can realize two-step-up transmitter without using costly multipliers and multi-bit digital-to-analog converters that are required in the conventional structure.
Keywords :
digital-analogue conversion; frequency modulation; multiplexing equipment; multiplying circuits; sigma-delta modulation; transmitters; Gilbert-cell structure; digital quadrature IF modulator; digital sigma delta modulator; in-phase modulator; multibit digital-to-analog converter; multiplexer; multipliers; output bit streams; quadrature intermediate frequency modulator; quadrature modulator; single-bit DAC; two-step-up transmitter; Radio frequency; Transceivers;
Conference_Titel :
ASIC (ASICON), 2011 IEEE 9th International Conference on
Conference_Location :
Xiamen
Print_ISBN :
978-1-61284-192-2
Electronic_ISBN :
2162-7541
DOI :
10.1109/ASICON.2011.6157291
