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A High Speed Heterodyne Measurement Concept Based on Two Extremely Linear Analog Frequency Ramps Generated with Fractional Divider Phase Locked Loops

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2 Author(s)
Much, T. ; Ruhr-Universitÿt Bochum, Institut fÿr Hochfrequenztechnik, Universitÿtsstraße 150, D-44780 Bochum, Germany. Telephone: +49 234 32 26496, Fax: +49 234 32 14 167, tom@hf.ruhr-uni-bochum.de ; Schiek, B.

Highly linear analog frequency ramps are employed in various measurement techniques. Fractional phase locked loops offer the possibility of generating fast analog frequency ramps with linearity errors in the range of 10¿8. For the characterization of frequency ramps with such small linearity errors a heterodyne measurement principle is introduced which is able to measure linearity errors of less than 10¿8 thus allowing to check the actual linearity of fractional ramp generators. This heterodyne concept is not only useful for measuring the linearity of frequency ramps but is also applicable to all sorts of heterodyne measurement systems combining the high speed of analog frequency ramps with the absolute precision and stability of a fully synthesized signal generator.

Published in:

Microwave Conference, 2000. 30th European

Date of Conference:

Oct. 2000

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