Signal Processing for Particle Detectors

In this work both a theoretical study and experimental measurements are shown to describe the ENC (Equivalent Noise Charge) contribution of the parallel √ f noise of a chargesensitive pre-amplifier in a nuclear spectroscopic chain. Previous works have demonstrated that this noise is produced by the distributed capacitive coupling to bulk of the preamplifiers' highvalued feedback resistors, which give rise to a R-C structure known in literature as "diffusive line". The introduced noise is particularly evident when such devices are integrated in a chip using a polysilicon layer that has intrinsically high distributed capacitance to the chip's bulk. Different shaping amplifiers are taken into consideration (analog quasi-Gaussian, digital trapezoidal/triangular, CR-RC n ) and closed-form expressions of noise coefficients are given whenever possible.

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“…Weighting coefficients K 1 and K 4 for a commercial 4 th -order Quasi-Gaussian shaping amplifier. [14].…”

Section: Trapezoidal and Triangular Shapingmentioning

confidence: 99%

Equivalent Noise Charge Contribution of the √f Parallel Noise in Nuclear Spectroscopic Measurements Using Different Shaping Amplifiers

Capra

Secci

Pullia

2023

IEEE Trans. Nucl. Sci.

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“…• " f parallel" noise which arises from thermal fluctuations in the dielectric components such as the circuit boards and wire carrier boards. Upon integration on the input capacitance this noise acts as a series 1/ f noise [21]. By design, this noise is much lower than other sources.…”

Section: Front-end Asic Inherent Noisementioning

confidence: 99%

“…The ENC is defined as the number of instantaneously collected electrons required so that their peak ADC count is equal to the root mean square (RMS) of the noise measured, also in the units of ADC counts. The ENC from the noise sources listed above can be approximated as [21,22]:…”

Section: Front-end Asic Inherent Noisementioning

confidence: 99%

“…The t p in equation 3.4 is the peaking time of the anti-aliasing filter. The dimensionless form coefficients for the semi-Gaussian impulse response functions, such as given by equation 3.1 and 3.2, are A 1 =2.0, A 2 =0.9 and A 3 =1.0 [21].…”

Section: Front-end Asic Inherent Noisementioning

confidence: 99%

“…The dimensionless form coefficients for the semi-Gaussian impulse response functions, such as given by equation. (3.1) and (3.2), are A 1 = 2.0, A 2 = 0.9 and A 3 = 1.0 [21].…”

Section: Front-end Asic Inherent Noisementioning

confidence: 99%

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Noise Characterization and Filtering in the MicroBooNE Liquid Argon TPC

et al. 2017

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A: The low-noise operation of readout electronics in a liquid argon time projection chamber (LArTPC) is critical to properly extract the distribution of ionization charge deposited on the wire planes of the TPC, especially for the induction planes. This paper describes the characteristics and mitigation of the observed noise in the MicroBooNE detector. The MicroBooNE's single-phase LArTPC comprises two induction planes and one collection sense wire plane with a total of 8256 wires. Current induced on each TPC wire is amplified and shaped by custom low-power, low-noise ASICs immersed in the liquid argon. The digitization of the signal waveform occurs outside the cryostat. Using data from the first year of MicroBooNE operations, several excess noise sources in the TPC were identified and mitigated. The residual equivalent noise charge (ENC) after noise filtering varies with wire length and is found to be below 400 electrons for the longest wires (4.7 m). The response is consistent with the cold electronics design expectations and is found to be stable with time and uniform over the functioning channels. This noise level is significantly lower than previous experiments utilizing warm front-end electronics.

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Fisher information analysis of depth-of-interaction estimation in double-sided strip detectors

2013

2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC)

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Signal Processing for Particle Detectors

Cited by 6 publications

References 58 publications

Equivalent Noise Charge Contribution of the √f Parallel Noise in Nuclear Spectroscopic Measurements Using Different Shaping Amplifiers

Equivalent Noise Charge Contribution of the √f Parallel Noise in Nuclear Spectroscopic Measurements Using Different Shaping Amplifiers

Noise Characterization and Filtering in the MicroBooNE Liquid Argon TPC

Fisher information analysis of depth-of-interaction estimation in double-sided strip detectors

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