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CICC 2005 John



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A 4 bit Ultra Wideband Beamformer with 4ps True Time Delay Resolution J D Roderick H Krishnaswamy K Newton and H Hashemi University of Southern California Outline Introduction and Applications A Prototype UWB Beamformer Subsystems Circuit techniques Passive modeling UWB Beamformer Performance Conclusion September 21 2005 CICC 2005 2 UWB Signal Time Domain Frequency Domain 3dB BW Fractional bandwidth BF 25 Second derivative Gaussian pulse Fine time resolution in impulse radar September 21 2005 CICC 2005 3 Potential Applications Impulse radar using UWB Beamforming Ground or building penetrating radar Biomedical imaging Location ranging and navigation Vehicular radar Depth resolution September 21 2005 Pulse width CICC 2005 1 Bandwidth 4 Narrow Band Beamforming Incident Wave c Speed of light f Signal frequency Signal wavelength d d 2 L Array Beam Pattern F VGA Phase Shifter Phase shifter is used to approximate time delay September 21 2005 CICC 2005 sin Lc f Lc f Beam Width c Lf 5 Narrow Band Beamforming Array Beam Pattern F VGA Phase Shifter Phase shifter is used to approximate time delay September 21 2005 CICC 2005 sin Lc f Lc f Beam Width c Lf 6 UWB Beamforming Incident Wave d c Speed of light f Signal BW T Pulse width T L Array Beam Pattern A Variable Delay True time delay is required in UWB beamforming September 21 2005 1 f CICC 2005 erf L f 2c L f 2c Beam Width Tc L 7 UWB Beamforming Array Beam Pattern A Variable Delay True time delay is required in UWB beamforming September 21 2005 CICC 2005 erf L f 2c L f 2c Beam Width Tc L 8 UWB Beamforming Summary Implementation requirements Monocycle Gaussian signal True time delay Features Higher depth resolution High scanning resolution No distinct side lobes Potential applications Impulse radar Imaging September 21 2005 CICC 2005 9 Outline Introduction and Applications A Prototype UWB Beamformer Subsystems Circuit Techniques Passive Design UWB Beamformer Performance Conclusion September 21 2005 CICC 2005 10 Beamformer



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