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Adaptive Frequency Sweep Linearization based on Phase Accumulator Principle

A novel approach to in-system monitoring of frequency sweep linearity is presented. Phase error measurement is carried out using a phase accumulator such as known from direct digital synthesizers (DDS). The successful application of this monitoring concept in an adaptive frequency sweep linearization system is shown by measurements of a 77-GHz linear frequency modulated continuous wave (LFMCW) radar transmitter.