High Precision Integrator for CVD-Diamond Detectors for Dosimetric Applications

DrAntonio, E.; Salvatori, S.; Oliva, P.; Patanè, Fabrizio; Girolami, M.

doi:10.1109/memea.2018.8438689

Cited by 6 publications

(5 citation statements)

References 25 publications

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“…In this work the characterization of a compact GI prototype is illustrated, emulating the noisy conditions found in a real environment. Front-end electronics of the circuit is based on the mature high precision charge integrator IVC102 which shows excellent performances for low-level signal conditioning [17][18][19][20]. To acquire either sourcing or sinking input currents, integrator output is then connected to a LT1991 gain-selectable amplifier.…”

Section: Introductionmentioning

confidence: 99%

A High-Precision Gated Integrator for Repetitive Pulsed Signals Acquisition

et al. 2019

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Gated integrating measurement method represents a widely used approach when fast, repetitive analogue signals are concerned. In this work a compact synchronized gated-integrator prototype has been realized and preliminary characterized. Front-end electronics is based on the mature high-precision switched-integrator transimpedance-amplifier IVC102 whose output is connected to a precision LT1911 inverting amplifier, whereas analogue-to-digital conversion, as well as timing control circuitry, are performed by a high-efficiency LPC845 microcontroller. Synchronizing signal detection with the external trigger generated in coincidence with a source, the proposed circuitry amplifies and integrates the signal only when the pulse is generated, displaying excellent performances in terms of linearity, sensitivity and signal-to-noise ratio. Hence, the proposed solution represents an affordable alternative to continuous-time regime measurement-techniques, usually adopted in radiation dosimetry where accuracy and sensitivity are strict requirements for treatment quality assurance.

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Section: Introductionmentioning

confidence: 99%

A High-Precision Gated Integrator for Repetitive Pulsed Signals Acquisition

et al. 2019

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“…Figure 1 illustrates the simplified schematic of the realized GI prototype. Integration is performed through the IVC102 chip, which demonstrates superior performance for low-level current conditioning [ 16 , 17 ]. For the experiments, a nominal integrating capacitance C INT of 100 pF was used and obtained by the parallel connection of the three capacitors available into the chip.…”

Section: Methodsmentioning

confidence: 99%

“…They compared the performance of the proposed system to that of lock-in amplifier for Eddy current sensor signal conditioning. Synchronous demodulation displayed only a slightly better time resolution, with a bandwidth of about 16 Hz, but with the advantages of compactness and cost effectiveness. Similarly, we also demonstrated in recent works the effectiveness of implementing synchronous integration for the dose-per-pulse monitoring of X-ray [8] and electron [15] beams employed in radiotherapy treatments.…”

Section: Introductionmentioning

confidence: 99%

Accurate Signal Conditioning for Pulsed-Current Synchronous Measurements

Pettinato

Girolami

Rossi

et al. 2022

Sensors

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This paper describes a compact electronic system employing a synchronous demodulation measurement method for the acquisition of pulsed-current signals. The fabricated prototype shows superior performance in terms of signal-to-noise ratio in comparison to conventional instrumentation performing free-running measurements, especially when extremely narrow pulses are concerned. It shows a reading error around 0.1% independently of the signal duty cycle (D) in the investigated D = 10−4–10−3 range. Conversely, high-precision electrometers display reading errors as high as 30% for a D = 10−4, which reduces to less than 1% only for D > 3 × 10−3. Field tests demonstrate that the developed front-end/readout electronics is particularly effective when coupled to dosimeters irradiated with the X-rays sourced by a medical linear accelerator. Therefore, it may surely be exploited for the real-time monitoring of the dosimeter output current, as required in modern radiotherapy techniques employing ultra-narrow pulses of high-energy photons or nuclear particles.

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“…Even if high-performance dedicated monolithic current source ICs are commercially available [ 23 ], for particular applications it is necessary to design a specific circuit able to meet some given requirements [ 24 ]. At the circuit board level, the simplest ways to build such current source is to apply a linear voltage ramp to a differentiation capacitor or to use precision both voltage references and resistor in order to increase the system accuracy and ensure it over time [ 25 , 26 ]. However, they are mainly realized starting from op-amps acting as Voltage-to-Current (V-I) converters (i.e., transconductance amplifiers) [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

“…Experimental results highlight that circuit accuracy is mainly limited to that of the REF200 precision current reference [ 23 ] used to supply the single-chip current divider. Moreover, with a thermal coefficient lower than 10 ppm/°C in the range 10–40 °C, the circuit represents a good choice as on-board calibration system for compact pA-meters [ 26 , 37 , 38 , 39 ]. In addition, the adopted circuit architecture both guarantees a voltage compliance close to power supply rails and the separation of current carrying electrodes of the sensor and the sensing point for voltage reading.…”

Section: Introductionmentioning

confidence: 99%

Compact Current Reference Circuits with Low Temperature Drift and High Compliance Voltage

Pettinato

Orsini

Salvatori

2020

Sensors

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Highly accurate and stable current references are especially required for resistive-sensor conditioning. The solutions typically adopted in using resistors and op-amps/transistors display performance mainly limited by resistors accuracy and active components non-linearities. In this work, excellent characteristics of LT199x selectable gain amplifiers are exploited to precisely divide an input current. Supplied with a 100 µA reference IC, the divider is able to exactly source either a ~1 µA or a ~0.1 µA current. Moreover, the proposed solution allows to generate a different value for the output current by modifying only some connections without requiring the use of additional components. Experimental results show that the compliance voltage of the generator is close to the power supply limits, with an equivalent output resistance of about 100 GΩ, while the thermal coefficient is less than 10 ppm/°C between 10 and 40 °C. Circuit architecture also guarantees physical separation of current carrying electrodes from voltage sensing ones, thus simplifying front-end sensor-interface circuitry. Emulating a resistive-sensor in the 10 kΩ–100 MΩ range, an excellent linearity is found with a relative error within ±0.1% after a preliminary calibration procedure. Further advantage is that compliance voltage can be opposite in sign of that obtained with a passive component; therefore, the system is also suitable for conditioning active sensors.

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High Precision Integrator for CVD-Diamond Detectors for Dosimetric Applications

Cited by 6 publications

References 25 publications

A High-Precision Gated Integrator for Repetitive Pulsed Signals Acquisition

A High-Precision Gated Integrator for Repetitive Pulsed Signals Acquisition

Accurate Signal Conditioning for Pulsed-Current Synchronous Measurements

Compact Current Reference Circuits with Low Temperature Drift and High Compliance Voltage

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