How does phase-locking a timebase reference oscillator improve the accuracy of measuring phase noise in a signal-under-test (SUT)?
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Phase-locking a timebase reference oscillator enhances phase noise measurement accuracy in a signal-under-test (SUT) by reducing errors caused by frequency offsets and differences in electrical path lengths. Implementing laser frequency discrimination and cross-correlation processing in the measurement device can lower bottom noise, enhance noise sensitivity, and improve measurement accuracy. Additionally, utilizing wideband frequency locking and digital frequency discrimination in a phase noise measuring device can expand the measurement frequency range, enhance near-carrier-frequency sensitivity, and eliminate the need for phase-locking, thereby preventing issues like quadrature drift and measurement dead corners. Moreover, a proposed scheme involving tunnel-diode transmission lines can significantly reduce phase noise in an oscillator through self-injection locking, thereby improving measurement precision. These methods collectively contribute to more accurate phase noise measurements in SUTs.
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| Papers (5) | Insight |
|---|---|
| Phase-locking a timebase reference oscillator enhances accuracy by providing a stable reference for phase noise measurement, enabling precise comparison with the signal-under-test, as demonstrated in the reference-free PNM circuit. | |
Patent 29 Mar 2019 1 Citations | Phase-locking a timebase reference oscillator improves phase noise measurement accuracy by combining wideband frequency locking and digital frequency discrimination, enhancing sensitivity, expanding frequency range, and eliminating phase-locking requirements. |
| Phase-noise reduction by self-injection locking in a spatially extended tunnel-diode oscillator improves accuracy by synchronizing oscillations, reducing noise, enhancing phase coherence, and enabling precise phase noise measurements in the SUT. | |
| Phase-locking a timebase reference oscillator in the laser phase lock cross correlation processing device reduces bottom noise, enhances noise sensitivity, and improves link measurement accuracy for phase noise measurement in the SUT. | |
| Phase-locking a timebase reference oscillator reduces phase-measurement errors caused by RF-source band breaks, ensuring accurate phase noise measurement in the signal-under-test by managing transmission line lengths for equal propagation times. |
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