A high performance dual band/dual mode CMOS RF transceiver for WiMAX and WLAN systems

A Dual Mode WiMAX/WLAN CMOS RF transceiver for the 2.5 and 3.5 GHz frequency bands is presented comprising one transmitter and two receivers. Current consumption of the direct conversion transceiver is 94/115 mA in TX and 83/105 mA in RX mode (2.5/3.5 GHz, 1 RX path active). Unwanted carrier and sideband leakage in transmit path can be calibrated using a dedicated downconversion mixer in a feedback loop configuration. The transmitter output power can be controlled over a dynamic range of 45 dB in 1 dB steps. Due to low PLL phase noise and high transmitter linearity an EVM of <- 38 dB has been achieved at -2 dBm output power. Noise figure of the receiver is 3.4/4 dB and EVM is -38/-36 dB in the 2.5/3.5 GHz frequency bands.