Title :
Broadband quadrature-modulator with parallel switchable quadrature-generation
Author :
Tiiliharju, E. ; Halonen, K.
Author_Institution :
Electron. Circuit Design Lab., Finland
fDate :
4/15/2004 12:00:00 AM
Abstract :
A new polyphase filtering topology is proposed which uses parallel switchable RC networks for accurate broadband 90° phasing. A 0.13 μm CMOS prototype IC using the proposed quadrature-generation network in a direct-conversion quadrature-modulator achieves a measured image rejection ratio of -39 dBc or better in 0.6-2.5 GHz.
Keywords :
CMOS integrated circuits; MMIC frequency convertors; RC circuits; UHF frequency convertors; modulators; network topology; prototypes; radio transmitters; switched filters; 0.13 micron; 0.6 to 2.5 GHz; CMOS prototype IC; broadband quadrature modulator; direct conversion quadrature-modulator; image rejection ratio; parallel switchable RC networks; parallel switchable quadrature-generation network; polyphase filtering topology;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20040338
