Title :
A quad band WCDMA transceiver with fractional local divider
Author :
Kamizuma, Hiroshi ; Yamawaki, Taizo ; Akamine, Yukinori ; Maeda, Koji ; Tanaka, Satoshi ; Hikasa, Kazuhiko
Author_Institution :
Hitachi Central Res. Lab., Hitachi
Abstract :
We developed a quad band (1, 6, 9, and 11) WCDMA transceiver with digital interface. The developed transceiver uses a 2/5 divider in the local part of the direct conversion architecture. Using the 2/5 divider, reduces the number of local synthesizers to only one in the architecture and avoid VCO pulling phenomena of the local synthesizer perfectly. This transceiver achieved 3% EVM and -46 dB ACLR, which is enough of a margin for standard specifications.
Keywords :
code division multiple access; transceivers; voltage-controlled oscillators; VCO; direct conversion architecture; fractional local divider; quad band WCDMA transceiver; Digital modulation; Frequency conversion; Frequency synthesizers; Multiaccess communication; Phase modulation; Phase shifters; Radiofrequency integrated circuits; Signal generators; Transceivers; Voltage-controlled oscillators; direct conversion; fractional divider; local synthesizer; multi-band; multi-mode; phase shifter;
Conference_Titel :
VLSI Circuits, 2008 IEEE Symposium on
Conference_Location :
Honolulu, HI
Print_ISBN :
978-1-4244-1804-6
Electronic_ISBN :
978-1-4244-1805-3
DOI :
10.1109/VLSIC.2008.4585966
