A quad-band W-CDMA transceiver IC–direct conversion architecture with fractional frequency divider

A quad-band (0.8, 1.7, 2, and 1.4 GHz) wideband code division multiple access (W-CDMA) transceiver, which uses a divide-by-2.5 frequency divider in local parts of a direct-conversion architecture, has been developed. Using the fractional-2.5 frequency divider reduces the fractional bandwidth of the voltage-controlled oscillator and avoids injection locking of the local RF synthesizer perfectly. This transceiver achieved 3% error-vector magnitude and—46 dB ACLR, which satisfy the margin given in standard specifications. © 2012 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.