A Low Power CMOS VCO for IEEE 802.11a Applications

A low power consumption CMOS complementary cross-coupled LC-tank voltage-controlled oscillator (VCO) is presented. The low power consumption VCO has been implemented with tsmc 0.18μm 1P6M CMOS technology. A pseudo-resistance transistor is utilized to reduce the DC bias current under a fixed supply voltage. The circuit consumes 2.58mA from a 1.6V power supply which saves up to 27% power compared with the conventional one. Furthermore, the proposed circuit which has oscillated frequency from 5.14GHz to 6.25GHz obtains 19.5% of tuning range. The phase noise achieves - 116dBc/Hz at 1MHz offset frequency. The designed VCO can cover the frequency range of both 5.15GHz-5.35GHz and 5.725GHz-5.825GHz which is suitable for IEEE 802.11a receiver.