In this thesis, a UWB pulse generator is designed to be implemented in IBM 0.13 um technology. The pulse generator has a high spectral efficiency. Using amplitude control, any mismatch, process variation or temperature variation can be compensated for to comply with the UWB FCC mask. The pulse has an approximate duration of 2ns. The current consumption is 13mA per pulse. The power consumption per pulse is 19.5 mW. The next stage can be a power amplifier or an antenna. In case of an antenna, the effect of bond pads and bond wires are taken into account. A challenging aspect of UWB systems is their interference with narrow-band systems. Narrow-band systems send very high power signals compared to the UWB signals and thus may saturate the UWB receiver and/or prevent reliable detection of the UWB pulses. A possible solution to this problem is filtering. In this thesis, a Wireless Local Area Network (WLAN) band rejection filter for UWB applications is designed using IBM 0.13 um technology. A new filter topology is used to implement the filter. This topology has the ability to actively read all the states of an LC filter without using extra inductors. Both AC and impulse responses are presented. The filter has a notch of approximately 14dB. It can operate over the military temperature range (-40 C to 125 C). The effects of mismatch and process variations on this design are acceptable.