Reconfigurable Multi-Band OFDM UWB Receivers: Circuits and System Considerations
ULTRA wideband (UWB) is intended to provide a standard for high-speed short range wireless communication [1, 2]. The ECMA 368 Standard  specifies the physical and medium access control layers for UWB networks using Multi-band Orthogonal Frequency Division Modulation (MB-OFDM). The spectrum from 3.1 to 10.6GHz is divided into 14 bands of 528MHz. Supported data rates range from 53.3 to 480 Mbps with a data-rate adaptation mechanism allowing each receiver to opt for the transmitter's data rate for the maximum throughput. The receiver RF front-end and the frequency synthesizer pose the highest design challenges.We will concentrate only on the former due to space limitations. Covering a broad bandwidth is quite challenging, especially for a CMOS implementation, where tuning out capacitive parasitics is the key to achieve low-power operation. An important aspect in UWB communication is the interference between different UWB devices and from other systems. Nearby wireless devices can produce in-band interference due to intermodulation and harmonic generation in the receiver front-end. In this chapter, we will evaluate the effects of interferers on the desired UWB signal, resulting from cross-modulation, intermodulation and harmonic distortion. Some of the existing receiver solutions will be reviewed and a receiver architecture with enhanced linearity performances will be described.
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