RF front-end of direct conversion receiver RFIC for cdma-2000

Abstract

We report on the front-end of a highly integrated dual-band direct-conversion receiver IC for cdma-2000 mobile handset applications. The RF front-end included a CELL-band low-noise amplifier (LNA), dual-band direct-conversion quadrature I/Q down-converters, and a local-oscillator (LO) signal generation circuit. At 2.7 V, the LNA had a noise figure of 1.2 dB and input third-order intermodulation product (IIP3) of 9 dBm. I/Q down-converters had a noise figure of 4-5 dB and IIP3 of 4-5 dBm and IIP2 of 55 dBm. An on-chip phase-locked loop and external voltage-controlled oscillator generated the LO signal. The receiver RFIC was implemented in a 0.35-/spl mu/m SiGe BiCMOS process and meets or exceeds all cdma-2000 requirements when tested individually or on a handset.