A low-spurious fast-hopping MB-OFDM UWB synthesizer

A frequency synthesizer for the ultra-wide band (UWB) group #1 is proposed. The synthesizer uses a phaselocked loop (PLL) and single-sideband (SSB) mixers to generate the three center frequencies of the first band group by mixing 4224 MHz with +/- 264 MHz and 792 MHz, respectively. A novel multi-QSSB mixer is designed to combine the function of frequency selection and frequency conversion for low power and high linearity. The synthesizer is fabricated in Jazz 0.18-mu m RF CMOS technology. The measured reference spur is as low as -69 dBc and the maximum spur is the LO leakage of -32 dBc. A low phase noise of -110 dBc/Hz @ 1 MHz offset and an integrated phase noise of 1.86 degrees are achieved. The hopping time between different bands is less than 1.8 ns. The synthesizer consumes 30 mA from a 1.8 V supply.