Abstract
This thesis presents the design of a fully integrated quad-band frequency synthesizer, which includes a switched-inductor VCO, programmable frequency divider, phase-frequency detector, charge pump, and 3-wire interface. The target frequency range of the synthesizer covers the four frequency bands specified by IEEE 802.11a/b/g standards which are the ISM band, UNII-1, UNII-2, and UNII-3 band. The VCO adopts a novel inductor switching network that provides a large switched frequency range with low phase noise and low power consumption. A multi-modulus prescaler with division number 512~1023 is proposed to achieve maximum 6GHz operation frequency. The fully integrated frequency synthesizer is implemented in TSMC 0.18 CMOS process. The measured frequency tuning ranges in the lower and upper bands are from 1.94GHz to 2.41GHz and 4.4GHz to 5.16GHz respectively. The PLL phase noise in the lower band is less than -114 dBc/Hz at 1MHz offset frequency. The total chip area is 1.083 x 1.083 and the power consumption is 20mW.