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Generation of Precise Frequency Ramps for FSCW Applications with a Fractional-N-PLL at 24 GHz

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4 Author(s)
Stelzer, A. ; Johannes Kepler University, Institute for Communications and Information Engineering, Altenberger Str. 69, A-4040 Linz, Austria, E-mail: ; Hoftberger, Josef ; Ettinger, K. ; Weigel, R.

For industrial microwave sensors operating in continuous wave (CW) mode in general an adequate frequency modulation is required. A common modulation scheme for distance sensors is frequency stepping (FS). In this paper we present a fast and highly accurate stepped ramp generator based on an integrated 24-GHz Silicon Germanium (SiGe) oscillator with fractional-N-PLL stabilization and modulation. Fast and accurate frequency steps are a prerequisite for achieving a good sensor performance. The dynamic behavior is verified by a phase and frequency evaluation of the ramp signal. Frequency overshoot typical for large frequency steps is reduced by a compensation technique in the PLL control signal of the ramp generator and is demonstrated by 100-MHz steps at 24.5 GHz.

Published in:

Microwave Conference, 2003 33rd European

Date of Conference:

Oct. 2003