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In this paper we present a 32-channel integrated circuit (ASIC) designed for a multi-anode silicon drift detector for X-ray imaging and spectroscopy (0.5 ÷ 100 keV). The ASIC includes 32 read-out front-end channels (ROC), each consisting of a low-noise preamplifier, a second-order RC-CR pulse shaper, a peak stretcher, an amplitude and a peak discriminator, as well as a reset and pile-up rejection...
In this paper we present a micro photovoltaic cell model, validated by the experimental results obtained from a test chip realized in 0.35-μm CMOS technology. In particular, we analyzed and modeled the behavior of an integrated p-n junction when irradiated with incident light with solar spectrum, considering the parameters of a conventional 0.35-μm CMOS technology. We considered...
In this paper we present a spectrometer realized by bump-bonding a 300-??m-pitch, 32 ?? 32 pixel silicon X-ray detector chip to a 0.35-??m CMOS, 3-cm2 read-out chip. The self-triggered, mixed analog-digital read-out chip, with 1024 channels, digitizes the X-ray photon energy with 10 bits of resolution, provides the coordinates of the triggered pixels and achieves 34 erms- of input referred noise,...
In this paper a large input swing integrated interface circuit for MEMS microphones is presented. It consists of an high impedance input buffer followed by a multi-bit (12-levels) analog second order SigmaDelta modulator and a fully-digital single-bit fourth-order SigmaDelta modulator. The circuit, supplied with 3.3 V, exhibits a current consumption of 215 muA for the analog part and 95 muA for the...
This paper presents a complete interface circuit for capacitive MEMS microphones, consisting of the cascade of a preamplifier, a second-order, multi-bit analog SigmaDelta modulator, and a fourth-order, single-bit digital SigmaDelta modulator. The complete interface circuit features a current consumption of 574 muA from a 3.3-V power supply, achieving a signal-to-noise and distortion ratio (SNDR) of...
This paper presents a complete gas-sensing chip. It consists of a high-efficiency temperature control loop with a switching power stage and digital set-point and of a wide-dynamic-range interface circuit able to operate without calibration. Measurements results show that the controlled temperature of the sensor over a range of 250degC exhibits an accuracy better than 1.5degC with a maximum peak-to-peak...
In this paper, we present the design and the characterization of a wide-dynamic-range interface circuit for resistive gas-sensors able to operate without calibration. The circuit is based on resistance-to-frequency conversion, which guarantees low complexity. The state-of-the-art of this measurement method has been improved first by separating the resistance value controlled oscillator circuit (RCO)...
This paper presents the design and experimental results for a 5 x 5 tin-oxide gas-sensor array system with particular focus on the employed multiplexed-analog-input 0.35 mum CMOS interface circuit chip. This interface circuit reads the electrical response of all the elements of the array in time sharing by means of a solid-state selector, actually exploiting a row-column query technique and provides...
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