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In the framework of the large-scale wireless sensor networks involved in the Internet-of-Things (IoT), analog-to-digital converters (ADCs) must target ever increasing levels of power efficiency and amenability to ultra-scaled CMOS technologies. Digitally intensive architectures and smart conversion algorithms are therefore the fuel of future ultra-low power (ULP) designs. The minimization of the output...
This paper introduces two novel ideas within the field of time-mode oscillator-based analog-to-digital conversion. In the form of a self-injection-locked ring-oscillator (SILRO), a method is presented to inherently linearise the voltage-to-frequency (V-F) characteristic, while an alternative proposal of an ultra-low-power (ULP), ultra-low-voltage (ULV) VCO-based analog-to-digital converter (ADC) operating...
In this work we present SFERA, a low-noise fully-programmable 16 channel readout ASIC designed for both X- and $\gamma $ -ray spectroscopy and imaging applications. The chip is designed to process signals coming from solid-state detectors and CMOS preamplifiers. The design has been guided by the use of Silicon Drift Detectors (SDDs) and CUBE charge sensitive amplifiers (CSAs), although we consider...
This work presents the development of a front-end integrated circuit (IC) targeting the readout of scientific Charge-Coupled Devices (CCDs) for a wide range of applications in the field of X-ray imaging. The reference detector considered is a high-performance 20×480, back-illuminated, n-substrate, fully-depleted CCD developed at the Lawrence Berkeley National Laboratory (LBNL) MicroSystems Lab. The...
This paper presents a first prototype of a 12-bit analog-to-digital converter (ADC) suitable for X and γ-ray multichannel readout front-ends for SDD signals processing. The task of the converter is the digitization of output multiplexed data at a sampling frequency up to 5 MS/s and about 11-bit accuracy. The chosen architecture is the fully-differential bridge-capacitor charge-redistribution (CR)...
Clinical SPECT/MRI applications based on indirect conversion require the use of large area solid-state detectors. Silicon Photomultiplier (SiPM) is a fast-improving technology suitable for this application, due to its compatibility with the MRI environment and to its high multiplication gain. Considering the large number of detectors of a SPECT ring, a multichannel ASIC is needed to have a compact...
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