A band-switching wide-band CMOS LC QVCO for multi-standard applications

A band-switching wide-band CMOS LC QVCO is designed. With a newly proposed LC tank, it achieves very wide tuning ranges in two separate bands: 1.94-3 GHz (42.9%) and 4.9-6 GHz (20%). In addition, it successfully satisfies the phase noise requirements of WCDMA and dual-band WLAN by adopting a new quadrature generation circuit. Therefore, the designed QVCO can be used for a multi-standard direct conversion receiver

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