An ultra wideband transmitter based on up conversion architecture

This paper presents a novel architecture of an ultra wideband (UWB) transmitter circuit. The transmitter is designed for high data rate wireless communication. It employs up conversion concept. The up conversion concept is to multiply Gaussian monocycle pulse with 6.4 GHz sine wave to push the spectrum of Gaussian monocycle pulse into higher frequency band. As a result, the FCC spectral mask can be used efficiently. The transmitter presented contains 6.4 GHz VCO source, divide-by-32 high frequency prescaler, Gaussian monocycle pulse generator, Gilbert cell BPSK modulator, differential to single converter, RF mixer and driven amplifier. The circuits are designed in 0.18 um RFCMOS technology from IMF (Institute of Microelectronics). Simulation showed the correct operation of the circuit for supply voltages of 1.8 V and a power consumption of 195 mW. And the transmitted pulse covers frequency bandwidth from 3.1 GHz to 10.6 GHz. All the circuit simulations are done by HPADS.