A Fully Integrated 2.4 GHz Mismatch-Controllable RF Front-end Test Platform in 0.18Ám CMOS

Zahra sadat Ebadi and Resve Saleh
University of British Columbia


The design and implementation of a prototype integrated 0.18Ám direct conversion receiver RF front-end for 2.4 GHz ISM band are described. The developed front-end provides user control of I/Q mismatch and includes a low-noise amplifier (LNA), two mixers and a voltage-controlled oscillator (VCO). It can be used as test vehicle for evaluation of various I/Q mismatch compensation methods implemented in the back-end. Also, it can be used to improve the I/Q amplitude imbalance, which results in dramatic increase in image rejection ratio (IRR). The prototype was fabricated using TSMC 0.18μm CMOS technology. This design includes Low noise amplifier (LNA), two mixers (Quadrature down conversion) and quadrature VCO. The I and Q path mixers can operate regularly, or they can be controlled externally to introduce a known mismatch or to compensate the estimated mismatch The circuit is designed in TSMC 0.18μm standard CMOS. It achieves a conversion gain of 40 dB, and a noise figure of 9.8 dB. The circuit dissipates 25 mW and occupies an active area of 2.5 mm2