A dual-carrier IR-based UWB transmitter with improved spectral efficiency

This paper describes a dual-carrier pulse-based ultra-wideband (UWB) transmitter for wireless personal area networks (WPANs). The UWB transmitter designed in 0.18 mum CMOS realizes an impulse radio communication using 3-5 GHz and 6-10 GHz bands with low power and low complexity. By using the multi-phase technique, the proposed dual band transmitter significantly reduces the noise power in 5-6 GHz WLAN bands while meeting the FCC noise mask efficiently. Binary phase shift keying (BPSK) and pulse position modulation (P PM) are employed to generate pulses of 1 ns duration and two center frequencies of 4 GHz and 8 GHz. Simulation results show that the pulse generator consumes 8.1 pJ/b with the minimum data rate of 1 Gb/s. When the system works in high speed mode, the dual band pulse carries two bits per period to have the data rate doubled.