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Silicon-based broadband short-range radar architectures and implementations

By Ta-Shun Chu


UnrestrictedA radar or wireless imaging system discriminate objects through the properties of scattered or reflected waveforms. Two parameters are typically important for a radar system, one is direction of arrival and the other is time of arrival. A target can be localized through the information provided by these two parameters. A larger instantaneous bandwidth is desirable to achieve higher resolution in active wireless imaging systems and better sensitivity in passive radiometry systems. This thesis presents silicon-based broadband short-range radar architectures and implementations.; Direction of arrival can be determined through beam-forming. Various broadband beam-forming architecture that enable single-chip integration have been proposed and experimentally demonstrated. High-speed samplers are often used to capture the reflected wave. Equivalent time sampling, time interleaved sampling, and averaging schemes are used to enable low-power CMOS realization of high-speed samplers for ultra wideband radar systems.; A broadband path-sharing true-time-delay beam-forming architecture has been proposed. A fully integrated CMOS ultra-wideband 4 channel timed array receiver in silicon technology is presented. The true-time-delay resolution is 15 ps and the maximum delay is 225 ps. The receiver provides 11 scan angles with almost 9 degrees of spatial resolution for an antenna spacing of 3 cm. The design bandwidth is from 1 to 15 GHz corresponding to less than 1 cm depth resolution in free space. A path-sharing true-time-delay architecture can reduce the chip area significantly for a linear broadband delay-sum beam-forming frontend.; A broadband multi-beam timed-array architecture has been proposed. The proposed multi-beam architecture can be implemented in one-dimensional and two-dimensional linear antenna array. A one-dimensional millimeter-wave SiGe multi-beam receiver and a two-dimensional broadband multi-beam CMOS receiver based on the proposed multi-beam architecture are presented. The reported one-dimensional millimeter-wave multi-beam array receiver can support 6 antennas and form 7 beams simultaneously. It covers 30GHz - 40GHz instantaneous wide bandwidth and achieves an 18⁰ spatial resolution and ±54⁰ of spatial coverage with 4mm antenna spacing. The reported two-dimensional broadband multi-beam receiver can support 2 x 2 antenna and form 7 x 7 beams simultaneously. The -3dB bandwidth of the receiver is from 3GHz to 15GHz. With 3cm of spacing between antenna elements, it achieves a 10⁰ spatial resolution and ±30⁰ of spatial coverage in each dimension. The proposed architecture uses much fewer delay elements and hence consumes much smaller area. Moreover, it is suitable for a planar process.; A highly-integrated, ultra-wideband impulse-based radar system has been implemented in CMOS technologies. The receiver utilizes equivalent-time and time-interleaved sampling to achieve coarse and ne range bins. The prototype is expected to sense the radio interaction between the radar system and a human body, and human cardiopulmonary and gait information can be collected

Topics: Electrical Engineering, biometric; radar; broadband; CMOS; integrated circuit; MM-wave radar
Publisher: University of Southern California. Libraries
Year: 2010
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Provided by: USC Digital Library
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