Extending the frequency range of digital noise measurements to the microwave domain

TL;DR

This paper introduces a technique to extend digital noise measurement capabilities into the microwave domain by transferring phase fluctuations to lower frequencies, validated against traditional methods, enhancing measurement accuracy and consistency.

Contribution

The paper presents a novel method for measuring phase noise at microwave frequencies using digital instruments beyond their sampling limits, eliminating calibration needs.

Findings

Validated the technique through comparison with conventional methods

Improved measurement consistency and eliminated calibration requirements

Discussed mechanisms affecting spectral measurement resolution

Abstract

We describe the use of digital phase noise test sets at frequencies well beyond the sampling rate of their analog-to-digital converters. The technique proposed involves the transfer of phase fluctuations from an arbitrary high carrier frequency to within the operating frequency range of the digital instrument. The validity of the proposed technique has been proven via comparison with conventional methods. Digital noise measurements eliminate the need for calibration and improve consistency of experimental results. Mechanisms limiting the resolution of spectral measurements are also discussed.