Simultaneous digital measurement of phase and amplitude noise

Ruppalt, Laura B.; McKinstry, D.R.; Lauritzen, Keir C.; Wu, Andi; Phillips, Shawn A.; Talisa, S.H.

doi:10.1109/freq.2010.5556365

Cited by 10 publications

(4 citation statements)

References 4 publications

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“…As a result, they achieved the digital phase noise measurement system with a phase noise floor about -170 dBc/Hz for the frequency range of 1-30 MHz. Based on the technique in [10], a digital phase/ amplitude modulation (PM/AM) noise measurement system [11] and a full digital phase noise measurement system [12] have been developed. To explain the pros and cons of our method, comparing it with the method in [10], which we refer to as the traditional method, is necessary.…”

Section: Sut Phase Noise Extractionmentioning

confidence: 99%

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An Efficient Cross-Correlation Method for a Digital Phase Noise Measurement System

Yeom

Roh²

2022

J. Electromagn. Eng. Sci

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In this paper, we propose a digital phase noise measurement using a 10-bit digital oscilloscope MXR608A from Keysight Technologies. The digital oscilloscope’s four channel data are used for digital phase noise measurement: two channels are assigned for the equally divided SUT (source under test), while the other two are assigned for the equally divided reference signals. First, we propose a cross correlation method to identify the phase noises added by the ADCs in the digital oscilloscope from the measured phase noises. Then, we propose a novel cross correlation method to extract the SUT phase noise. The cross-correlation output of the proposed method yields only the SUT phase noise and does not contain the reference signal phase noise unlike the traditional method. The proposed method was applied to measure the phase noises of the two SUTs, Keysight’s synthesized signal generator E8257D and function generator 33600A. The measured phase noises of the two SUTs were compared and found to show remarkable agreements with those measured using Keysight’s signal source analyzer E5052B. The phase noise floor of our digital phase noise measurement system is about -160 dBc/Hz.

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Section: Sut Phase Noise Extractionmentioning

confidence: 99%

“…Due to the low-frequency range, it must be used in conjunction with a down converter to measure the phase noise of SUTs at higher frequencies. Several studies have been conducted to extend digital phase noise measurement systems to higher frequencies using subsampling or downconverters [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

An Efficient Cross-Correlation Method for a Digital Phase Noise Measurement System

Yeom

Roh²

2022

J. Electromagn. Eng. Sci

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“…New methods for the phase and amplitude noise measurement of oscillators have been proposed in the past years, based on digital systems [1][2][3][4][5][6][7][8] . Some reasons are just obvious: reconfiguration flexibility and compactness of digital hardware.…”

Section: Introductionmentioning

confidence: 99%

Noise characterization of analog to digital converters for amplitude and phase noise measurements

Cardenas-Olaya

Rubiola

Friedt

et al. 2017

Review of Scientific Instruments

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Improvements on electronic technology in recent years have allowed the application of digital techniques in phase noise metrology, where low noise and high accuracy are required, yielding flexibility in system implementation and setup. This results in measurement systems with extended capabilities, additional functionalities, and ease of use. In most digital schemes, the Analog to Digital Converters (ADCs) set the ultimate performance of the system; therefore the proper selection of this component is a critical issue. Currently, the information available in the literature describes in depth the ADC features only at frequency offsets far from the carrier. However, the performance close to the carrier is a more important concern. As a consequence, the ADC noise is, in general, analyzed on the implemented phase measurement setup. We propose a noise model for ADCs and a method to estimate its parameters. The method retrieves the phase modulation and amplitude modulation noise by sampling around zero and maximum amplitude, a test sine-wave synchronous with the ADC clock. The model allows discriminating the ADC noise sources and obtaining the phase noise and amplitude noise power spectral densities from 10 Hz to one half of the sampling frequency. This approach reduces the data processing, allowing an efficient ADC evaluation in terms of hardware complexity and computational cost.

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“…The measurement of phase noise is described, e.g., in an application note [16], and papers [17][18][19][20][21][22]. In [18], [19], descriptions of simultaneous amplitude and phase noise measurement are presented. In [23], a more precise amplitude noise measurement method can be found.…”

Section: Local Oscillator Noise Measurementmentioning

confidence: 99%