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 3.5GHz frequency bands is presented comprising one transmitter and two receivers. Current consumption of the direct conversion transceiver is 94/115mA in TX and 83/105mA in RX mode (2.5/3.5GHz, 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 45dB in 1dB steps. Due to low PLL phase noise and high transmitter linearity an EVM of <-38dB has been achieved at -2dBm output power. Noise figure of the receiver is 3.4/4dB and EVM is -38/-36dB in the 2.5/3.5GHz frequency bands.