PLL frequency-synthesizers

ohyoung

Abstract—The synthesis of linear frequency sweeps or chirps is
required, among others, in frequency-modulated continuous
wave radar systems for object position estimation. Low phaseand
frequency-errors in sweeps with high bandwidth are a prerequisite
for good accuracy and resolution, but in certain applications
where high measurement rates are desired, the additional
demand for short sweep cycles has to be met. Transient phenomena
in dynamic synthesizers as well as non-linear system behavior
usually cause unknown phase errors in the system output. For
the class of phase-locked-loop-based frequency-synthesizers a
novel output phase measurement method and dedicated circuitry
are proposed that allow significant reduction of phase errors by
adaptive input predistortion. The measurement procedure is
implemented within the PLL control circuitry and does not
require external equipment. The application of this method to
PLL system identification and linearization of extremely short
frequency sweeps is shown.

【文件名】:07430@52RD_101109TCSI2007895512.pdf
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