All-digital synthesizable UWB transmitter architectures

This paper presents two all-digital synthesizable pulsed-ultra-wideband (UWB) transmitter architectures. Both delay line-based and ring oscillator-based architectures proposed in this paper are synthesized and place-and-routed (PAR) with existing design tools. This design flow eliminates custom circuit design and layout, thus significantly enhancing design productivity. Also, the center frequency and the bandwidth of the output signals are tuned digitally to compensate for the variation induced by the PAR or to adapt to various applications. To verify the feasibility of the architectures, FPGA prototypes are implemented. The measured output signals of the prototype circuits meet the target spectrum specifications by tuning the mismatch in delay.