Integrated band voltage controlled oscillator and mixer with LNA for wireless communications

Abstract

A simple low phase noise and wide tuning range voltagecontrolled oscillator (VCO) and mixer with charge injection designed for 10 GHz band application. The proposed oscillator adopts a complementary cross-coupled pair LC-VCO circuit with only one symmetrical inductor and implemented in TSMC 0.18-um CMOS process. At the supply voltage of 1.8 V, measured results achieve a tuning range of 9.6 to 11.08 GHz, corresponding to 13.9 %, a phase noise under -115.1 dBc/Hz at a 1 MHz offset frequency from 10.02 GHz with a tuned control voltage from 0 to 1.7 V and an output power of -2.231 dBm at 50-termination and at 10.02 GHz. The proposed broadband CMOS double-balance mixer for wireless receiver is presented. Measurement of the CMOS mixer is performed using an integrated fixture. In the communicated low-band, input return loss is higher than 8.5 dB. The proposed VCO, without the need of any off-chip device, is well suitable for the networking integration of wireless systems.