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A fully integrated voltage-controlled oscillator (VCO) for IEEE 802.11a WLAN transceivers is proposed and implemented in 0.18 μm CMOS technology with 1.8 V supply voltage. The VCO core adopts the topology of complementary cross-coupled differential inductance-capacitance (LC) tank. The VCO operates from 4.56 to 4.77 GHz with the varactor control voltage (Vtune) changing from 0.3 to 1.5 V and has a gain (Kv) of 175 MHz/V. A phase noise of -122.3 dBc/Hz at 1 MHz offset frequency is demonstrated for an oscillation frequency of 4.56 GHz. The average power consumption of this VCO is 30.24 mW.
Date of Conference: 20-23 Oct. 2008