Design and simulation of pulse generator for Ultra Wide Band impulse radio

The demand for high data rate applications is on the rise in the recent years which is due to the rapid growth in wireless communication. The existing technologies like Wireless Fidelity (Wi-Fi) and Bluetooth cannot support such high data rates because of their narrowband and also they drain the battery at rapid pace. Ultra Wide Band (UWB) system differs from conventional narrow band system by transmitting short duration pulses occupying a large bandwidth with power levels almost comparable to that of the noise floor. Any communication technology which uses more than 500 MHz of bandwidth in the range of 3.1 to 10.6 GHz is defined as UWB. The transmitter side of impulse radio consists of pulse generator and modulator. The pulse generator is used to generate the required short pulse in the desired range of frequency. The proposed pulse generator is of pulse combination type impulse generator which is fully digital constructed with MOS Current Mode Logic (MCML) as Fine Delay Elements without using passive components thus reducing circuit complexity. The proposed pulse generator is designed using 90 nm technology with 1 V supply voltage. The maximum power consumption is 330 μW. The output voltage shape complies with FCC regulation.