System level analysis of a direct-conversion WiMAX receiver at 5.3 GHz and corresponding mixer design

The growing demand for WiMAX integrated circuits has motivated the system level analysis of a direct-conversion receiver at 5.3 GHz and the corresponding mixer circuit design. The specifications set by the IEEE WirelessMAN 802.16 protocol are met. The corresponding mixer circuit is designed using MOSFETs in a 0.25μm SiGe BiCMOS technology. Inductive resonance technique is used to succeed optimum conversion gain, as well as minimum noise figure and maximum linearity. The double-balanced Gilbert Cell mixer experiences a conversion gain of 8.5 dB, a noise figure of 5.4 dB and a input 3^rd order intercept point of 3 dBm, while consuming 12.5 mW. The mixer’s overall performance is exceptional compared to other published work.