A low phase noise multi-band LC VCO using a switched differential inductor

This paper presents a low phase noise multi-band LC VCO using a switched differential inductor in a standard 0.18 μm CMOS technology. In the proposed LC VCO, it is achieved multi-bands of 0.9, 1.8, 2.4, and 4.5GHz, and the phase noises of −133, −135, −125, and −127 dBc/Hz at 1MHz offset, respectively. The chip size is 1.0 × 1.1mm2 including pads. The DC power consumption is 16.2mW at 1.8V supply voltage.