Design of high performance digital baseline restorers

Pullia, A.; Gritti, Giovanni; Ripamonti, G.

doi:10.1109/23.603665

Cited by 17 publications

(5 citation statements)

References 14 publications

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“…However addressing the issues associated to PPRT optimization is beyond the scopes of this work and will be the subject of a future paper. A more complex functional block is the digital baseline restorer BLR [16]. Such a digital stage improves the low-frequency-disturbance rejection, by subtracting an estimate of the baseline from the pulse-area measurement, or, more precisely, making the overall filtering Fig.…”

Section: State Of the Art: Digital Pur And Blrmentioning

confidence: 99%

Spectroscopic technique for optimal P-Z setting in /spl gamma/-ray detection

Pullia

2001

IEEE Trans. Nucl. Sci.

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A spectroscopic technique for optimally setting the pole-zero (P-Z) compensation in a digital spectrometer has been implemented, which has substantially improved the resolution of the measurements at high count rates. Before analog-to-digital conversion, the signal undergoes an analog preprocessing, consisting of P-Z compensation and simple three-pole shaping, which is the proper antialiasing-filter shape in this context. A subsequent suitable digital filter optimizes the overall weight function and introduces digital baseline restoration. It is well known that an imperfect P-Z setting causes pulse-tail pileup which is seen as an additional noise and may impact significantly on the final resolution of the measurements, particularly at high count rates. A spectroscopic technique which permits a second-order tuning of the P-Z compensation is proposed. Such a fine-tuning degree yields a substantial improvement in the performance of the system. Namely, at a count rate of 24 kcounts/s the second-order tuning (1% adjustment) yields a 30% narrowing of the 1.17 MeV 60 Co line.Index Terms-Digital baseline restorer, gidital signal processing, digital spectrometry, optimal filter, pole-zero compensation.

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Section: State Of the Art: Digital Pur And Blrmentioning

confidence: 99%

Spectroscopic technique for optimal P-Z setting in /spl gamma/-ray detection

Pullia

2001

IEEE Trans. Nucl. Sci.

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“…Improving further the quality of the internal reference voltage and its filtering in future ADC models would make the chip fully adequate for this demanding application. 10 100 1000 1000 10000 (4) (1)…”

Section: Technique and Experimental Measurementsmentioning

confidence: 99%

Using Analog-to-Digital Converter ADC1413D for high-resolution gamma-ray spectroscopy

Pullia

Barrientos

Bazzacco

et al. 2014

2014 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)

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14-bit Analog-to-Digital Converter ADC1413D as operated at 100 MS/s is here evaluated for high-resolution gamma-ray spectroscopy using the germanium crystals of the AGATA/GALILEO detectors. The performance of the chip in terms of noise is studied as a function of the amount of analog DC offset applied before digitization. Such a DC offset is considered for the purpose of dynamic range optimization. The quality of the ADC voltage reference is found to be paramount in this regard. Best results are obtained using an external voltage reference as strongly filtered for noise suppression. The in-chip voltage reference is found to be almost adequate for the considered application but a stronger internal filter would help. In fact when using the internal voltage reference the energy resolution as evaluated on the 59.54 keV line of 241 Am worsens by up to 18%, when a DC offset of -36% Full Scale is enforced. No such effect is observed when using the filtered external reference.

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“…The advantages of this architecture are well known for a long time [4]. The flexibility of the DPP approach enables, at one time, the synthesis and application of optimum weighting functions (WF) when the objective is to achieve the best possible energy resolution [5,6] and, at other time, using the same system, the application of a very simple and fast processing WF when the objective is to achieve the highest possible count rate [7]. On the other hand, the DPP approach significantly reduces the effect of the random nature of the radioactive decay process by the inclusion of several digital buffers or stacks.…”

Section: Digital Pulse Processing Architecturesmentioning

confidence: 99%

Dead-time analysis of digital spectrometers

Cardoso

Simões

Correia

2004

Nuclear Instruments and Methods in Physics Research Section A:

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This paper studies the impact that the outcome of new digital architectures has brought to dead time of spectrometers. Special emphasis is given to the performance comparison between conventional spectrometers and the most important architectures usually adopted in the digital solutions. Dead-time analysis is accomplished through a dedicated numerical simulation application developed with the purpose of optimizing the digital architecture performance taking into account parameters such as the incident rate of events, the existence of pulse pileup or the complexity of the processing algorithm used during the digital pulse processing. Results of simulations using a real time multiprocessor platform (Digital Pulse Processing-M8) are presented and design options are justified accordingly.

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Design of high performance digital baseline restorers

Cited by 17 publications

References 14 publications

Spectroscopic technique for optimal P-Z setting in /spl gamma/-ray detection

Spectroscopic technique for optimal P-Z setting in /spl gamma/-ray detection

Using Analog-to-Digital Converter ADC1413D for high-resolution gamma-ray spectroscopy

Dead-time analysis of digital spectrometers

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