# Cross-spectrum noise measurements at 4 K to minimize power-splitter anti-correlation effect

@article{Hati2017CrossspectrumNM, title={Cross-spectrum noise measurements at 4 K to minimize power-splitter anti-correlation effect}, author={Archita Hati and Craig W. Nelson and David P. Pappas and David A Howe}, journal={arXiv: Instrumentation and Detectors}, year={2017} }

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 oscillator is at or near the level generated by the thermal noise of the 50 ohm source resistor. The measurement is devoid of the anti-correlation effect that originates from the common mode power splitter in a cross-spectrum technique. The anti-correlation effect is mitigated by cooling the power splitter to a…

## References

SHOWING 1-10 OF 15 REFERENCES

### Cross-spectrum measurement of thermal-noise limited oscillators.

- PhysicsThe Review of scientific instruments
- 2016

The newly discovered effect of anti-correlated thermal noise that originates from the common-mode power divider (splitter), an essential component in a cross-spectrum noise measurement system is discussed.

### Correlation-based phase noise measurements

- Physics
- 2000

In the characterization of the phase noise of a component, it is common practice to measure the cross-spectrum density at the output of two phase detectors that simultaneously compare the component…

### Cross-Spectrum PM Noise Measurement, Thermal Energy, and Metamaterial Filters

- PhysicsIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
- 2017

It is shown that a systematic error is always present if the thermal energy of the input power splitter is not accounted for, which can result in noise underestimation up to a few decibels in the lowest-noise quartz oscillators, and in an invalid measurement in the case of cryogenic oscillators.

### Source impedance influence on cross-correlation phase noise measurements

- Physics2013 Joint European Frequency and Time Forum & International Frequency Control Symposium (EFTF/IFC)
- 2013

The phase noise floor of an oscillator has been shown both theoretically and experimentally to be the ratio of the source noise power divided by the delivered power. In a 50Ω system this is…

### Power splitter thermal noise correlations in cross-spectrum noise measurements

- Physics2016 IEEE International Frequency Control Symposium (IFCS)
- 2016

We discuss collapse of the cross-spectrum phase noise measurement of thermally-limited oscillator due to anti-correlated thermal noise of the Wilkinson power splitter. We also examine effect of…

### Cross-correlation phase noise measurements

- PhysicsProceedings of the 1992 IEEE Frequency Control Symposium
- 1992

The noise floor of a typical two channel phase noise measurement system is set by the phase detector and amplifiers that follow the detector. If the phase noise of two oscillators is measured using…

### The cross-spectrum experimental method

- Physics
- 2010

The noise of a device under test (DUT) is measured simultaneously with two instruments, each of which contributes its own background. The average cross power spectral density converges to the DUT…

### Cross-spectral collapse from anti-correlated thermal noise in power splitters

- Physics2016 European Frequency and Time Forum (EFTF)
- 2016

We discuss the cross-spectral collapse due to anticorrelated thermal noise that originates from the common-mode power divider (splitter) in a cross-spectrum noise measurement system. We studied this…

### A collapse of the cross-spectral function in phase noise metrology.

- PhysicsThe Review of scientific instruments
- 2014

A set of amplitude and phase conditions where the detection of the desired signal using cross-spectral analysis fails partially or entirely in the presence of a second uncorrelated signal is demonstrated.

### The specification of oscillator characteristics from measurements made in the frequency domain

- Physics
- 1966

A cross-correlation technique for measuring the very short-term (milliseconds to seconds) properties of stable oscillators is described. Time-dependent functions representing signals from two…