A 1.5 V 3.1 GHz-8 GHz CMOS synthesizer for 9-band MB-OFDM UWB transceivers

This paper presents the design of a CMOS synthesizer for dual-conversion zero-IF2 Multi-Band OFDM (MB-OFDM) transceivers covering the first 9 frequency bands from 3.1 GHz to 8.0 GHz, each with a bandwidth of 528 MHz. A wideband single-sideband mixer with wideband inductive network loading is proposed. Moreover, a modified transformer-coupled quadrature VCO and interconnection-loading-insensitive layout technique are employed. Fabricated in TSMC 0.18-mu m CMOS process and operated at 1.5 V, the synthesizer measures phase noise of - 127.4 dBc/Hz at 10 MHz offset, integrated phase noise of 4.43 degrees, sideband suppression of better than -22 dBc, and a switching time of less than Ins while consuming 59 mA.