A 3GHz to 7GHz fast-hopping frequency synthesizer for UWB

A 3 to 7 GHz fast-hopping frequency synthesizer for ultra-wideband (UWB) applications, realized in a standard digital 0.13 μm CMOS copper technology is presented. The synthesizer is based on single-sideband (SSB) up- or downconversion of a low frequency (LF) input by means of an integrated LC-VCO used as local oscillator (LO). Two LO are selectable to achieve the large output frequency range with reduced LF bandwidth requirements. This select multiplexer can also be used to pulse the output frequency of the synthesizer with switching times less than 1 nsec. Operating from a 1.5 V supply the LO leakage and sideband suppression is better than -25 dBc for downconversion and <-18 dBc for upconversion, which is sufficient for UWB applications. Measured output frequency range is 3.3 to 6.1 GHz, limited by measurement equipment. Power consumption is 95 mW and module area 0.7 mm² including pads.