Signal generation for ultra-wideband short-range radar system
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[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT AUTHOR'S REQUEST.] In this thesis work, an ultra-wideband signal generator circuitry is presented for the Ultra-wideband Short-range Radar Human ID System. Investigation is carried out towards various UWB pulse candidates for Ultra-wideband Short-Range Radar Human ID System. Simulation results by Matlab for candidates of interest are given. Typical UWB pulse generator circuits are analyzed. Simulation results of 5th derivative Gaussian pulse generator in Cadence are provided. This is important because the 7th-order derivative Gaussian pulse generation relies heavily on 5th-order derivative Gaussian pulse generation. The circuit of UWB 7th derivative Gaussian pulse generator is presented. The transistor level circuit is simulated in Cadence with optimized parameters to generate a 7th derivative Gaussian pulse meeting UWB FCC mask. The design of 7th derivative Gaussian pulse generator generates a pulse that complies with FCC mask directly without shape filtering or frequency up-converting. The pulse generated has a wide bandwidth of 4.1 GHz to 10.6 GHz that not only stands out in UWB pulse generation but also exceeds the least 1.5 GHz bandwidth required for constructing and comparing the footprints in the UWB SRR Human ID System. Also the circuit is rather simple compared with the digital-controlled method which also fits the FCC mask directly.
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