A frequency planning and generation scheme for multi-standard wireless transceivers

This work presents a novel frequency planning scheme associated with a reference frequency generation scheme that has the potential of providing low phase noise contribution for several wireless standards including DCS1800, WCDMA II and III, DECT, WLAN a/b/g and Bluetooth. The scheme is particularly useful when implemented in future technologies and can be extended to cover newer wireless standards in newer bands of interest. It uses a single multi-band voltage-controlled oscillator (VCO) with switching inductors and high speed dividers directly generating the quadrature outputs. The VCO itself covers the frequency ranges from 4.8 GHz to 6 GHz and from 6.8 GHz to 8 GHz. Its phase noise is -136 dBc/Hz at 1 MHz offset from a center frequency of 1.85 GHz. The design is sent for fabrication using 0.18 mum CMOS.