Quantization Noise in Advanced LIGO Digital Control System

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Abstract:: Advanced LIGO implements hundreds of control loops using digital signal processing techniques. These controllers are known to inject noise due to round-off error as signals are IIR filtered, and converted to and from the digital domain. In this project, the origins of this quantization noise, and its analysis have been investigated for the digital controller implemented at the Advanced LIGO sites. The quantization noise analysis is done for all its sources viz. the digital filters, Analog to Digital Converters(ADCs) and Digital to Analog Converters (DACs). The quantization noise in filters depend on the digital filter structure which has been thoroughly analyzed in this study. The report also would summarize the results of quantization noise analysis in the DAC code and noise shaping implementation so that the quantization noise level is mitigated in the frequency band of interest to gravitational wave detection.

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PDF for final presentation (PDF for Final Presentation.pdf, file is not accessible)
PDF version of pptx (Presentation _ Quantization Noise in aLIGO Digital Con...pdf, file is not accessible)
Presentation 7/22 LLO (Presentation _ Quantization Noise in aLIGO Digital Co...pptx, file is not accessible)
The collection of SVG files of quantization noise analysis for digital filters of both the Hanford and Livingston sites. (Filter_Analysis.zip, file is not accessible)
The first progress report (Report_I_Quant_Noise.pdf, file is not accessible)
The project proposal (Quantization Noise.pdf, file is not accessible)
The second progress report (Progress_Report_II.pdf, file is not accessible)

Keywords:: quantization noise digital filters digital controller digital control system ADC DAC

LIGO Document T1500351-v1