International Journal of Microwave Science and Technology / 2015 / Article / Fig 6

Research Article

Implementation of a Cross-Spectrum FFT Analyzer for a Phase-Noise Test System in a Low-Cost FPGA

Figure 6

Cross-correlation phase-noise measurement with the APPH6040. The DUT was ultra-low-phase-noise 100 MHz OCXO. The grey trace shows a measurement with only one correlation. The blue trace shows a measurement with correlations in stage 0 (5–50 MHz), correlations in stage 1 (0.5–5 MHz), and so on. Both measurements were performed with the internal reference sources of the APPH6040. Same measurement time of ca. 11 sec for both measurements.

We are committed to sharing findings related to COVID-19 as quickly and safely as possible. Any author submitting a COVID-19 paper should notify us at to ensure their research is fast-tracked and made available on a preprint server as soon as possible. We will be providing unlimited waivers of publication charges for accepted articles related to COVID-19. Sign up here as a reviewer to help fast-track new submissions.