Design of a Linear FMCW Radar Synthesizer with Focus on Phase Noise
The linear FMCW radar has become more popular in recent years mainly due to
advances in digital signal processing and the good performance of the radar at close
ranges. What puts limits to the performance is mainly phase noise. Because trans-
mission and reception happen simultaneously, the phase noise will limit the maxi-
mum power that should be used and hence also the ability to detect weak targets.
By ensuring during the design process that the phase noise is low, the radars perfor-
mance will thus get better. This thesis describes the construction of a FMCW radar
frequency synthesizer where the focus is mainly on phase noise. The functionality
of the circuit is shown to be successful, but there is more phase noise than what is
predicted. Several causes for this are discussed. Important background theory about
radars, phase noise and phase-locked loops is presented and several simulations are
performed in order to get a better understanding. The conclusion of the work is
that it is not very hard to build a synthesizer, but in order to tweak the phase noise
performance to be as good as the linear theory tells it to be, careful attention must
be paid during all stages of the design.
Place, publisher, year, edition, pages
Institutt for elektronikk og telekommunikasjon , 2012. , 164 p.
ntnudaim:6889, MTEL elektronikk, Radioteknikk og kommunikasjon
IdentifiersURN: urn:nbn:no:ntnu:diva-16787Local ID: ntnudaim:6889OAI: oai:DiVA.org:ntnu-16787DiVA: diva2:536458
Eide, Egil, Førsteamanuensis IIRosshaug, Harald