This paper presents a reconfigurable 0.18 μm CMOS ultra-wideband transmitter which supports three modulation schemes: transmitted reference binary phase shift keying, binary phase shift keying and on-off keying. The circuit features three controllable glitch generators combined with a digitally reconfigurable pulse adder which provides the desired output modulation. The transmitter achieves data rates of 100 Mbps with a maximum simulated power usage of 672 μW, while respecting the FCC radiated emissions limits. The transmitted reference allows for a detector to use a straightforward self-correlating mechanism, thus simplifying the required receiver architecture.