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A study of different pixel implementations working around 300 GHz is presented. They are monolithically integrated in a standard low-cost CMOS process with a high performances read-out chain for signal processing. All the different pixel configurations are compliant with the integrated metal stack and the imposed density rules of the technology. A test-chip, composed of a total of 17 cases of study,...
To achieve better and faster material discrimination in applications like security inspection, X-Ray image sensors giving a highly resolved energy spectrum per pixel are required. In this paper, a new pixel architecture for spectral imaging is presented, exhibiting a 256 bin spectrum per pixel in a single image duration, up to two orders of magnitude higher than previous works. A prototype circuit,...
In a high-speed digital X-ray imager, each pixel in the matrix needs an analogue-to-digital converter (ADC) in order to assess the energy of the randomly incoming photons. The analogue-to-digital (AD) conversion rate is thus highly dependent on the photon flux parameters, i.e. its mean and its standard deviation. In classic designs, this rate is often set to ten times the maximum photon flux mean,...
A THz 31×31 pixel, 100 fps image sensor integrated in a 130 nm CMOS process is presented. Taking advantage of the possibility to modulate the active source that lights the scene, a significant improvement in sensitivity and NEP is achieved by shifting the modulated THz radiation, by means of an antenna/MOSFET, then filtering the signal band using an in-pixel 16-paths passive SC-filter combined with...
Ce papier présente les principaux acquis du projet « tomographe à émission de positons à semiconducteur pour l’imagerie médicale » (TOPASE-MED), dont l’objectif était d’étudier la faisabilité et le potentiel d’un imageur TEP basé sur la technologie de détecteurs à semiconducteur CdTe. Les objectifs étaient, d’une part, de dimensionner par simulation un imageur TEP préclinique basé sur cette technologie,...
In order to understand the dynamics of large neural networks, where information is widely distributed over thousands of cells, one of today's challenges is to successfully record the simultaneous activities of as many neurons as possible. This is made possible by using microelectrodes arrays (MEA) positioned in contact with the neural tissue. Thanks to microelectronics’ microfabrication technologies,...
A 16 channel front-end IC dedicated to small animal positron emission tomography has been developed for cross-strip CdTe detectors. Each channel, designed to handle up to 20 pF detector capacitance, includes both low voltage (2 nV/Hz1/2) and low current (40 fA/Hz1/2) noise, high bandwidth (50 MHz at 20 pF detector capacitance) current amplifier with a gain of 100 for a power consumption of 4.7 mW...
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