Design and Analysis of a Low Power UWB Transmitter Using Second Derivative Gaussian Pulse

A low-power ultra-wideband (UWB) transmitter is proposed with the basic building blocks having an oscillator, modulator, and pulse generator using 90-nm CMOS technology in Cadence Virtuoso using a smaller number of transistors and passive elements. Frequency is generated using a ring oscillator with a common-gate switching nMOS to vary the delay. Different frequency is generated by varying the control voltage from 1V to 5V generating a 5.6 GHz to 7.0 GHz carrier wave. Moreover, a different range of frequency generation is also proposed with different capacitor values with the ring oscillator. BPSK modulation technique is implemented for its higher efficiency over other techniques. A very compact high-frequency BPSK design is proposed for the modulation circuit. Then, a Gaussian second-order pulse is generated with a 140ps pulse width. Gaussian pulse with varying widths can also be generated using the proposed model. The maximum sizing used for the transistors does not exceed 2 µm. The simulation results show the better performance of the transmitter in case of noise, efficiency, and BER over the other existing UWB transmitters.