A fast-hopping 3-band CMOS frequency synthesizer for MB-OFDM UWB system

A fast-hopping 3-band (mode 1) multi-band orthogonal frequency division multiplexing ultra-wideband frequency synthesizer is presented.This synthesizer uses two phase-locked loops for generating steady frequencies and one quadrature single-sideband mixer for frequency shifting and quadrature frequency generation.The generated carriers can hop among 3432 MHz,3960 MHz,and 4488 MHz.Implemented in a 0.13μm CMOS process,this fully integrated synthesizer consumes 27 mA current from a 1.2 V supply.Measurement shows that the out-of-band spurious tones are below -50 dBc,while the in-band spurious tones are below -34 dBc.The measured hopping time is below 2 ns.The core die area is 1.0×1.8 mm2.