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Summary form only given, as follows. In this paper a low-power multi-gigabit single-chip transceiver is demonstrated in 90nm CMOS operating in the worldwide allocated 7.2GHz??8.5GHz ultra-wideband frequency spectrum. The transceiver operates as an MB-OFDM compatible front-end as well as a single-carrier modulator/demodulator with an integrated BPSK baseband modem. An embedded pulse shaping filter enables transmission of 2.4Gbps data while meeting the UWB spectral mask from 7.2GHz??10.2GHz and 1Gbps in the worldwide-allocated band of 7.2GHz??8.5GHz. The analog bandwidth of the transmitter is greater than 2GHz in a 7.7GHz??8.9GHz carrier frequency range. The receiver supports up to 2.5Gbps demodulation with a voltage conversion gain of 48dB, a 3dB double-sided bandwidth of around 2.5GHz, and a noise figure of only 4.5dB. The transceiver operates at a power budget of less than 33pJ/bit. To the best of the authors?? knowledge, this demonstrates the maximum throughput at minimum power budget and noise figure among CMOS transceivers operating at higher ultra-wideband frequencies.