A WiMAX Receiver with Variable Bandwidth of 2.5 - 20 MHz and 93 dB Dynamic Gain Range in 0.13-μm CMOS Process

A low-IF receiver for WiMAX applications has been designed and fabricated in TSMC 1P8M 0.13-μm CMOS process. It contains an on-chip single-ended low noise amplifier, balun, double-balanced mixers, and an analog baseband which consists of programmable gain amplifiers and a fifth-order Butterworth channel selection filter. The programmable gain amplifiers provide 0-65 dB gain range in ldB step and less than 0.4 dB gain error. The bandwidth of the channel selection filter is reconfigurable from 2.5 MHz to 20 MHz for different requirements in WiMAX applications. The receiver has 4.6 dB noise figure and consumes 50.4 mW with a 1.2 V power supply.