Removing random phase contributions of sweeping local oscillator from modulated RF measurements

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Removing random phase contributions of sweeping local oscillator from modulated RF measurements
Title:
Removing random phase contributions of sweeping local oscillator from modulated RF measurements
Journal Title:
IEEE Transactions on Microwave Theory and Techniques
Publication Date:
01 December 2018
Citation:
Y. Zhang et al., "Removing Random Phase Contributions of Sweeping Local Oscillator From Modulated RF Measurements," in IEEE Transactions on Microwave Theory and Techniques, vol. 66, no. 12, pp. 5737-5749, Dec. 2018. doi: 10.1109/TMTT.2018.2879507
Abstract:
This paper proposes a measurement strategy to remove the random phase contributions of the sweeping local oscillator (LO) from modulated radio frequency (RF) phase measurements based on down-conversion. To obtain a stable phase spectrum for each run of tone-by-tone sweeping measurement, the LO used for down-conversion is coupled out to an extra path and modulated to be a wideband multisine signal. By monitoring the phase change of multisine signal at a specific and fixed frequency point, random LO phase offsets during the frequency sweep can be measured and compensated. In this paper, two experimental test benches with the same core measurement strategy but different architectures are established for method validation. According to the experimental results using test bench one, the phase stability is ±(0.2~0.4) deg. at 1.8 GHz for fundamental mixing based down-conversion, and ±(0.6~1) deg. for harmonic mixing at 6 GHz. Based on test bench two, relative phase deviations of ±(0.8~1.2) deg. at 22 GHz for fundamental mixing, and ±(2~3) deg. at 66 GHz for harmonic mixing, are reachable.
License type:
PublisherCopyrights
Funding Info:
Description:
© 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
ISSN:
1557-9670
0018-9480
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