Noise Considerations of Integrators for Current Readout Circuits

Bechen, Benjamin; Kemna, A.; Gnade, Michael; Boom, T.J.J. van den; Hosticka, B.J.

doi:10.5194/ars-3-331-2005

Cited by 2 publications

(1 citation statement)

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“…Observation of the OTA output voltage showed that the signal generated by ionisation chambers can be very noisy. The noise associated with current read out integrators is studied in detail in [24]. A similar analysis resulted in a cumulative noise voltage of 119 µV in frequency band of 1 mHz to 10 GHz at the OTA output.…”

Section: Radioactive Sourcementioning

confidence: 99%

An Ultra Low Current Measurement Mixed-Signal ASIC for Radiation Monitoring Using Ionisation Chambers

et al. 2022

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Measurement of total ionizing dose in a radiation field is efficiently carried out by ionisation chambers. The paper details the design of a mixed-signal ASIC for the front-end electronics of ionisation chambers. A single chip solution for ultra-low current measurement is designed by combining the current processing analog section realized using low leakage thick gate transistors and the data handling digital section implemented using fast thin gate transistors. The design succeeds in limiting the cross coupling between the two circuit domains using deep nwells and guard rings. The ASIC fabricated in 130 nm technology attains a wide dynamic range of -7 fA to -20 µA with maximum error in measurement less than ±4 %. The ASIC occupies an area of 3.52 mm 2 and has a total power consumption of 17.4 mW. The femtoampere range input leakage current of the ASIC contributed primarily by the ESD diodes was found to be varying exponentially with temperature. Dose rate measurements from 5 µSv/h to 7.4 Sv/h is demonstrated by interfacing the ASIC to an ionisation chamber.

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Section: Radioactive Sourcementioning

confidence: 99%

An Ultra Low Current Measurement Mixed-Signal ASIC for Radiation Monitoring Using Ionisation Chambers

et al. 2022

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Giant Magnetoresistive Biosensor Array for Detecting Magnetorelaxation

Zhou

Huang

Hall

2017

IEEE Trans. Biomed. Circuits Syst.

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In this paper, a time-domain magnetorelaxometry biosensing scheme is presented using giant magnetoresistive (GMR) sensors to measure the fast relaxation response of superparamagnetic magnetic nanoparticles (MNPs) in a pulsed magnetic field. The system consists of an 8 × 10 GMR sensor array, a Helmholtz coil, an electromagnet driver, and an integrator-based analog front-end needed to capture the fast relaxation dynamics of MNPs. A custom designed electromagnet driver and Helmholtz coil improve the switch-off speed to >5 Oe/μs, limiting the dead zone time to <10 μs, and thus enables the system to monitor fast relaxation processes of 30 nm MNPs. A magnetic correlated double sampling technique is proposed to reduce sensor-to-sensor variation by 99.98% while also reducing temperature drift, circuit offset, and nonlinearity below the noise level. An optimum integration time is calculated and experimentally verified to maximize the SNR. Experiments with dried MNPs have shown successful relaxation detection, and immunoassay experiments have demonstrated their binding kinetics.

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Noise Considerations of Integrators for Current Readout Circuits

Cited by 2 publications

References 1 publication

An Ultra Low Current Measurement Mixed-Signal ASIC for Radiation Monitoring Using Ionisation Chambers

An Ultra Low Current Measurement Mixed-Signal ASIC for Radiation Monitoring Using Ionisation Chambers

Giant Magnetoresistive Biosensor Array for Detecting Magnetorelaxation

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