Ultra wide-band high-order pulse digital transmitter IC in 90nm CMOS for biomedical radar sensing

In this paper, an UWB transmitter for next generation bio-radar sensing system characterized by a high data rate, low area, low power consumption, and low complexity, and specifically designed to fit Canada UWB spectrum mask, is proposed for real-time bio-medical sensing. The transmitter is based on an all digitally controlled circuit pulse generator in 90nm CMOS to generate the tenth-order derivative of Gaussian pulse with bi-phase modulation scheme operating in the 6-10GHz band specified by Canada draft spectrum specification. The switch diplexer presents a 0.5dB insertion loss. The transmitter core occupies an chip area of 200um×140um. Simulating on a 1V voltage supply, the transmitter draws average 9.037mW when generating the tenth-order Gaussian derivative pulses at a pulse repetition frequency of 50MHz. The transmitter has an output power of 7.08dBm and each pulse carries an energy of 3.1pJ.The pulse is digitally synthesized and bi-phase modulated. This transmitter prototype can generate any other pulse combinations with minor design modifications. The predicted performance of the bio-radar is also evaluated and discussed.