Performance enhancement of a WCDMA/HSDPA+ receiver via minimizing error vector magnitude

Abstract

SNR enhancement of a 6-band WCDMA/ HSDPA+ directconversion transceiver supporting 21 Mbps High Speed Downlink Packet Access Evolved (HSDPA+) in a single CMOS die is evaluated in this paper. The paper mainly focuses on enhancing SNR performance of a WCDMA/HSDPA+ receiver by minimizing the error vector magnitude (EVM) with the digital compensations of the amplitude and group delay variations of the analog channel selection filter, and bandwidth optimization in the cases of the absence and presence of the adjacent channel interferers (ACIs). The measurement results show that the receiver achieves RX EVM below 3% and 4%, respectively, for WCDMA QPSK and HSDPA+ 64-QAM signals across a very wide input signal power range in all bands, and negligible SNR degradation in the presence of the ACIs.