Abstract
This paper presents a dual-band LC voltage switched VCO in 0.18 μm CMOS technology, which can be regulated between 2.4–2.9 GHz and 4.2–5 GHz frequency band. The proposed LC VCO is realized employing a tunable LC tank, including switched capacitors and differential inductor with switched transistor, which makes the dual-band operation. Also, the LC VCO is implemented with low phase noise performance using two switched inductors at common source nodes. The measured phase noises at 2.4 GHz and 5 GHz are −136 dBc/Hz and −126 dBc/Hz at 1 MHz offset. The chip size is 1 × 1.1 mm2, including pads. The DC power consumption is 8.1 mW at 1.8 V supply voltage.
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