National Physical Laboratory

Characterisation and behaviour of comb phase-standards

Further Information

Published: 8 March 2012

Authors: David Humphreys, Matthew Harper, James Miall and Dominique Schreurs

Related: Electromagnetics

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Measurement of two phase-standard designs based on different technologies, over a range of drive frequencies shows differences in behaviour.

The step-recovery based design is nonlinear with both power and frequency but the time-domain pulse response of the newer phase standard shows little variation with drive frequency.

Source-match of the phase standard is a potential source of phase error and a load-pull approach is proposed to provide this correction. The measurement system is traceable to the electro-optic primary standard at NPL. Interpolation methods for comb frequency results are discussed.

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Last Updated: 2 Nov 2015
Created: 9 Mar 2012


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