Temperature and supply voltage insensitive OOK transmitter for UWB outdoor communications

Most of the literature on Ultra Wide Band (UWB) transmitters is focused on indoor communications. This paper presents the architecture of an Impulse Radio Ultra Wide Band (IR-UWB) transmitter for outdoor communications which complies with the FCC spectral limits. The transmitter consists of a pulse generator (PG) and a deriver circuit and has an operating frequency between 3.1 GHz and 6.4 GHz. The pulse output amplitude is ~ 700mV peak-to-peak into a 50Ω resistive load. The maximum data rate that can be achieved by the transmitter is 250Mbps at an overall power efficiency of 6.3%. The transmitter is compensated for voltage and temperature (VT) variations. The output pulse energy changes by less than 24% as the temperature varies from -55°C to 100°C, and by less than 5% as the supply voltage varies between 2.3 and 3.6V. The design is implemented in 180nm CMOS process and the simulation results with extracted R, L, C parasitics are presented.