A 5-GHz CMOS double-quadrature receiver for IEEE 802.11a applications

A 5-GHz CMOS double-quadrature front-end receiver for Wireless-LAN application is proposed. In the receiver, a one-stage RLC phase shifter is used to generate quadrature RF signals and an active polyphase filter is designed to reject image signals. It has the advantages of low power dissipation, small chip area, and low sensitivity to parasitic components. Implemented in 0.18 um CMOS technology, the receiver chip can achieve 50.6 dB image-rejection with the power dissipation of 22.4 mW at 1.8-V voltage supply.