Chip design of a high performance LC-VCO and mixer charge-injection signal processing for WiMAX communication and internet application

A high performance current-reused CMOS LC-voltage-controlled oscillator (LC-VCO) for WiMAX communication and internet application is fabricated in TSMC 0.18-μm CMOS process. The proposed VCO applies the complementary cross-coupled technique and uses differentially tuned accumulation MOS varactors. Measured results achieve 27.86% frequency tuned range when biased between 0-1.8 V, tunable output frequency from 2.81 to 3.71 GHz, output power of -5.54 dBm and phase noise of -122 dBc/Hz at 1 MHz offset from lower frequency of 2.816 GHz, and good value of FOM (Figure of Merit) of -180.8 dBc/Hz. The broadband CMOS double-balance mixer for wireless is presented. The broadband mixer is fabricated with the 0.18 μm CMOS process. Measurement of the CMOS mixer is performed, the input return loss is higher than 8.5 dB. The chip area including pads is only 0.488 mm² and the power dissipation including buffers is 13.5 mW.