Frequency domain detectors in different short-range ultra-wideband communication scenarios
EURASIP Journal on Wireless Communications and Networking
A low-voltage high-linearity ultra-wideband down-conversion mixer in 0.18-µm CMOS technology
Microelectronics Journal
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Ultra-wideband communications systems offer unique challengesand opportunities for RF circuit design. Proper understanding ofthe trade-offs that system specifications impose upon the circuitdesigner is essential in optimizing a system for UWB. The definingattribute of UWB is the wide fractional bandwidth of the signal.This wide bandwidth can be achieved in several ways: withcarrierless systems, with a wide-bandwidth single carrier spread-spectrumsystem, with a multi-carrier system such as OFDM, viafrequency hopping, or via some combination of these methods.This paper provides detailed impact analysis of wide fractionalbandwidth on RF frontend circuits and examines the various trade-offs.In particular, wide-bandwidth channels limit the instantaneousQ allowable in the signal path. This requires modificationsof the traditional narrowband design methods. Some of the issuesdiscussed in this paper include: issues of broadbanding, power impact,fast hopping tradeoffs, power amplifier, and antenna issues.