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An all-digital CMOS WDMA UWB transmitter with 10pJ/pulse 200Mbit/s

A multi-access ultra-wideband (UWB) transmitter with waveform division multiple access (WDMA) mode is proposed for 3-5GHz applications. WDMA divides different users by controlling the combination of two orthogonal waveforms according to pseudo random code. A low-power all-digital mode is employed to implement the couple of orthogonal Gaussian pulses to achieve high spectrum efficiency under the FCC limitation floor. The proposed transmitter with data modulation circuit was designed by 180nm CMOS process. Simulation results show that the transmitted signal has an amplitude of 500mV and a bandwidth of 3-5GHz, consuming 10pJ/pulse at a baseband data rate of 200Mbit/s.