Title :
A 71∼86GHz, 2.5Gbps high performance millimeter-wave direct up-conversion quadrature modulator
Author :
Long, Miao ; Zhi-Gong, Wang
Author_Institution :
Inst. of RF-& OE-ICs, Southeast Univ., Nanjing, China
Abstract :
An ultra-wide bandwidth and high performance up-conversion quadrature modulator operating at 71 GHz ~ 86 GHz has been designed based on OMMIC GaAs 0.2 ¿m pHEMT technology. The core circuit is the monolithic I-Q vector modulator employing two bi-phase cold-pHEMT amplitude modulators. By optimizing and tuning, the results show the excellent performance at the whole bandwidth. With no baseband predistortion, 64QAM modulation can be produced at 500 MBps with EVM better than 8%. The communication capacity can reach 2.5 Gbps except for some coding redundancy. To date, this represents the highest reported ability for direct multilevel carrier modulation using monolithic technology.
Keywords :
III-V semiconductors; MMIC; gallium arsenide; high electron mobility transistors; modulators; GaAs; bi-phase cold-pHEMT amplitude modulators; coding redundancy; core circuit; direct multilevel carrier modulation; millimeter-wave direct up-conversion quadrature modulator; monolithic I-Q vector modulator; Amplitude modulation; Bandwidth; Baseband; Circuit optimization; Gallium arsenide; Millimeter wave circuits; Millimeter wave communication; Millimeter wave technology; PHEMTs; Predistortion;
Conference_Titel :
Solid-State and Integrated-Circuit Technology, 2008. ICSICT 2008. 9th International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-2185-5
Electronic_ISBN :
978-1-4244-2186-2
DOI :
10.1109/ICSICT.2008.4734802
