Title :
Direct-conversion quadrature modulator MMIC design with a new 90/spl deg/ phase shifter including package and PCB effects for W-CDMA applications
Author :
Wu, Jian-Ming ; Han, Fu-Yi ; Horng, Tzyy-Sheng ; Lin, Jenshan
Author_Institution :
Dept. of Electr. Eng., Nat. Sun Yat-Sen Univ., KaohsiungNational
fDate :
6/1/2006 12:00:00 AM
Abstract :
This paper presents a wideband code-division multiple-access direct-conversion quadrature modulator monolithic-microwave integrated-circuit (MMIC) design that employs a new technique to generate the 90deg phase shift with low implementation loss. From the bare-chip measurement, this new 90deg phase shifter has been proven with an amplitude and phase error less than 0.6 dB and 0.8deg, respectively, within the applied frequency range from 1.85 to 1.98 GHz. The package and printed circuit board (PCB) interconnects are also analyzed using the three-dimensional electromagnetic simulation tool and transformed into the equivalent-circuit elements for co-simulation with the designed quadrature modulator MMIC. The degradation of error vector magnitude and sideband suppression due to the package and PCB can be well predicted and verified by measurements. Although the proposed 90deg phase shifter has a remarkable advantage over the others in implementation loss, it is quite susceptible to the package and PCB effects and needs more design efforts to deal with those effects
Keywords :
MMIC phase shifters; UHF integrated circuits; UHF phase shifters; circuit simulation; code division multiple access; equivalent circuits; integrated circuit interconnections; modulators; printed circuits; quadrature amplitude modulation; 1.85 to 1.98 GHz; 3D electromagnetic simulation tool; MMIC design; PCB effects; PCB interconnects; UHF; W-CDMA; bare-chip measurement; direct-conversion quadrature modulator; equivalent-circuit elements; error vector magnitude; monolithic-microwave integrated-circuit design; phase shifter; printed circuit board interconnects; sideband suppression; wideband code division multiple access; Electromagnetic measurements; Frequency measurement; MMICs; Modulation coding; Multiaccess communication; Packaging; Phase measurement; Phase modulation; Phase shifters; Wideband; Package and printed circuit board (PCB) effects; phase shifter; quadrature modulator;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2006.874866