Publications (7)
Cross-spectrum Measurement of Thermal-noise Limited Oscillators
Archita Hati, Craig W. Nelson, David A. Howe
Cross-spectrum analysis is a commonly-used technique for the detection of phase and amplitude noise of a signal in the presence of interfering noise. It extracts the desired correl…
Phase inversion and collapse of the cross-spectral function
Craig W. Nelson, Archita Hati, David A. Howe
Cross-spectral analysis is a mathematical tool for extracting the power spectral density of a correlated signal from two time series in the presence of uncorrelated interfering sig…
Photon-Count Statistics of Crab X-ray Pulses: Skellam Behavior and Excess Variance in the Main Pulse
Max Worchel, Margaret M. Ferris, Sasha Levina +15
The Crab pulsar (PSR B0531+21) provides an unusually rich test bed for statistical studies of high-energy photon-counting data, owing to its extreme brightness and the contrasting…
Feedback and harmonic locking of slot-type optomechanical oscillators to external low-noise reference clocks
Jiangjun Zheng, Ying Li, Noam Goldberg +8
We demonstrate feedback and harmonic locking of chip-scale slot-type optomechanical oscillators to external low-noise reference clocks, with suppressed timing jitter by three order…
PM noise of a 40 GHz air-dielectric cavity oscillator
Archita Hati, Craig W. Nelson, B. Riddle +1
We describe the design of a low-phase-modulated (PM) noise, 40 GHz oscillator that uses a conventional air-dielectric cavity resonator as a frequency discriminator to improve the P…
Cross-spectrum noise measurements at 4 K to minimize power-splitter anti-correlation effect
Archita Hati, Craig W. Nelson, David Pappas +1
We report an accurate measurement of the phase noise of a thermally limited electronic oscillator at 300 K. By thermally limited we mean that the white signal-to-noise ratio of the…
A Detection of Red Noise in PSR J18242452A and Projections for PSR B1937+21 using NICER X-ray Timing Data
Jeffrey S. Hazboun, Jack Crump, Andrea N. Lommen +17
We have used X-ray data from the Neutron Star Interior Composition Explorer (NICER) to search for long time-scale, correlated variations ("red noise") in the pulse times of arrival…