Title :
A highly-integrated fractional-N synthesizer for FMCW radar
Author :
Eickhoff, Ralf ; Ellinger, Frank ; Ussmueller, Thomas ; Spiegel, Solon
Author_Institution :
Dresden Univ. of Technol., Dresden
Abstract :
This paper presents an integrated synthesizer for frequency ramp generation in local positioning systems using frequency modulated continuous wave (FMCW) radar in the ISM band at 5.8 GHz. The synthesizer is designed and implemented as a fractional-N phase locked loop (PLL) in a 0.18 mum SiGe-BiCMOS technology controlled by a MASH 1-1-1 SigmaDelta-modulator, which is integrated on an FPGA. Besides preventing spurs in the output spectrum, this digital control allows a flexible programming of the synthesizer with respect to its frequency ramp generation and output spectrum respectively. The complete fractional-N synthesizer was integrated into a single system PCB and measurements regarding phase noise and tuning range were performed. Moreover, an FMCW radar system using this synthesizer achieved an accuracies of 13 cm in indoor environments.
Keywords :
BiCMOS integrated circuits; CW radar; FM radar; Ge-Si alloys; digital control; field programmable gate arrays; frequency synthesizers; indoor radio; modulators; phase locked loops; phase noise; printed circuits; semiconductor materials; sigma-delta modulation; telecommunication control; FPGA; PCB; PLL; digital control; frequency modulated continuous wave radar; frequency ramp generation; highly-integrated fractional synthesizer; indoor environments; local positioning systems; phase locked loop; phase noise; Digital control; Field programmable gate arrays; Frequency modulation; Frequency synthesizers; Multi-stage noise shaping; Noise measurement; Phase locked loops; Phase measurement; Phase noise; Radar;
Conference_Titel :
Microwaves, Communications, Antennas and Electronic Systems, 2008. COMCAS 2008. IEEE International Conference on
Conference_Location :
Tel-Aviv
Print_ISBN :
978-1-4244-2097-1
Electronic_ISBN :
978-1-4244-2098-8
DOI :
10.1109/COMCAS.2008.4562801
