Title :
A 5GHz-band SiGe-MMIC quadrature modulator using a circular polyphase filter for 1Gbps transmission
Author :
Nakajima, Kensuke ; Suematsu, Noriharu ; Murakami, Keishi ; Takagi, Tadashi ; Nakase, Hiroyuki ; Isota, Yoji ; Tsubouchi, Kazuo
Author_Institution :
Inf. Technol. R&D Center, Mitsubishi Electr. Corp., Kamakura, Japan
Abstract :
A 5GHz-band SiGe-MMIC direct conversion quadrature modulator using a circular polyphase filter for high data rate is described. High I/Q vector accuracy is achieved using a circular polyphase filter with a completely symmetric layout as a 90 degrees LO power divider. By combining high cut-off frequency baseband amplifiers and broad-band unit mixers, a fabricated quadrature modulator shows the EVM of 3.3% rms at 5.5 GHz using 64-QAM OFDM signals with the channel bandwidth of 204 MHz, which corresponds to the data rate of 1.161 Gbps.
Keywords :
Ge-Si alloys; MMIC; microwave filters; modulators; 1 Gbit/s; 1.161 Gbit/s; 204 MHz; 5 GHz; 5.5 GHz; MMIC quadrature modulator; QAM OFDM signals; SiGe; amplifiers; circular polyphase filter; mixers; power divider; Baseband; Cutoff frequency; Distributed parameter circuits; Information filtering; Information filters; OFDM modulation; Radio frequency; Resistors; Transceivers; Transmission lines;
Conference_Titel :
Microwave Conference, 2005 European
Print_ISBN :
2-9600551-2-8
DOI :
10.1109/EUMC.2005.1610092
