Abstract
The design of a low-voltage 2.4GHz voltage controlled oscillator (VCO) employing 3D helical inductors fabricated in the 0.18-mum 1P6M CMOS technology is reported. The LC resonators consist of two 3D helical inductors and varactors. The aim of using 3D inductor is to reduce chip size, the inductance of inductor is designed to be 2nH. and the size of the inductor is 155times155 mum2. At the supply voltage of 1.0V, the VCO core consumes power of 2.6mW and the measured phase noise is -116.8dBc/Hz at 1MHz offset from the oscillation frequency of 2.46GHz. The output frequency can be tuned from to 2.06GHz to 2.5GHz
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