A current-reuse quadrature VCO for wireless body area networks

This paper presents implementation of a low-power quadrature voltage controlled oscillator (QVCO) for medical implant communication service (MICS) applications. The proposed QVCO adopts a parallel-coupling scheme to combine two current-reuse VCOs (P-QVCO). The proposed QVCO has been implemented in 180 nm RF CMOS technology. Simulation results show that the P-QVCO consumes 2.6 mA from 1.2 V supply and achieves very low phase noise of -140 dBc/Hz@1MHz when the carrier frequency is 400 MHz.