Hardware Architectures for IR-UWB-Based Transceivers - Ultra Wideband Wireless Body Area Networks - page 70

Fig. 4.1 Base band pulse generation approach

Fig. 4.2 An example pulse generation circuit [ 10 ], IEEE copyright

approach for the development of UWB pulse generators using off-the-shelf com-
ponents. The up-conversion UWB pulse generation technique described in [ 12 ]is
shown in Fig. 4.3 .
In this method, the triangular pulse is generated using an integration circuit in
combination with an inverter. The triangular pulse generator in fed with a Pulse
Position Modulated (PPM) data waveform. The integration happens at the rising
and falling edges of the data waveform. The amplitude of the baseband triangular
pulse can be determined by the threshold of the integrator. The baseband triangular
pulse is then up-converted into the higher frequencies using a mixer. The ring
activation circuit activates the oscillator only when a pulse is present, hence it
reduces the overall energy consumption of the circuit.