Journal
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume 60, Issue 3, Pages 757-765Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMTT.2011.2180398
Keywords
FMCW; fractional-N synthesizer; millimeter wave; radar system; SiGe bipolar ICs; ultra-wideband
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Funding
- Ministry of Economic Affairs and Energy of the State of North Rhine-Westphalia [315-43-02/2-005-WFBO-009]
- German Federal Ministry of Education and Research [FKZ 13N9822]
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A radar system with an ultra-wide FMCW ramp bandwidth of 25.6 GHz (approximate to 32%) around a center frequency of 80 GHz is presented. The system is based on a monostatic fully integrated SiGe transceiver chip, which is stabilized using conventional fractional-N PLL chips at a reference frequency of 100 MHz. The achieved in-loop phase noise is approximate to-88 dBc/Hz (10 kHz offset frequency) for the center frequency and below approximate to-80 dBc/Hz in the wide frequency band of 25.6 GHz for all offset frequencies >1 kHz. The ultra-wide PLL-stabilization was achieved using a reverse frequency position mixer in the PLL (offset-PLL) resulting in a compensation of the variation of the oscillators tuning sensitivity with the variation of the N-divider in the PLL. The output power of the transceiver chip, as well as of the mm-wave module (containing a waveguide transition), is sufficiently flat versus the output frequency (variation <3 dB). In radar measurements using the full bandwidth an ultra-high spatial resolution of 7.12 mm was achieved. The standard deviation between repeated measurements of the same target is 0.36 mu m.
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