Xu J.,IMEC |
Offermans P.,IMEC |
Meynants G.,CMOSIS nv |
Duy Tong H.,Nanosens BV |
And 2 more authors.
This paper presents a fully integrated lock-in amplifier intended for nanowire gas sensing. The nanowire will change its conductivity according to the concentration of an absorbing gas. To ensure an accurate nanowire impedance measurement, a lock-in technique is implemented to attenuate the low frequency noise and offset by synchronous demodulation or phase-sensitive detection (PSD). The dual-channel lock-in amplifier also provides both resistive and capacitive information of the nanowire in separate channels. Measurement results of test resistors and capacitors show a 2% resolution in the resistance range 1040 kΩ and a 3% resolution in the capacitance range 0.51.8 nF. Moreover, a 28.732.1 kΩ impedance variation was measured through the lock-in amplifier for a single palladium nanowire that was exposed to a decreasing hydrogen concentration (10% H2 in N2 to air). The chip has been implemented with UMC 0.18 μm CMOS technology and occupies an area of 2 mm2. The power consumption of the readout circuit is 2 mW from a 1.8 V supply. © 2010 Elsevier Ltd. All rights reserved. Source
CMOSIS nv | Date: 2014-05-02
A pixel comprises a pinned photodiode for generating charges in response to incident radiation and a sense node. A transfer gate is positioned between the pinned photodiode and the sense node for controlling transfer of charges to the sense node. A reset switch is connected to the sense node for resetting the sense node to a predetermined voltage. A first buffer amplifier has an input connected to the sense node. A sample stage is connected to the output of the first buffer amplifier and is operable to sample a value of the sense node. A second buffer amplifier has an input connected to the sample stage.
CMOSIS nv | Date: 2012-01-05
A pixel includes a photo-sensitive element for generating charges in response to incident radiation. A transfer gate is positioned between the photo-sensitive element and a sense node for controlling transfer of charges to the sense node. A reset switch is connected to the sense node for resetting the sense node to a predetermined voltage. A first buffer amplifier has an input connected to the sense node and an output connected to a sample stage operable to sample a value of the sense node. A second buffer amplifier has an input connected to the sample stage. Control circuitry operates the reset switch and causes the sample stage to sample the sense node while the photo-sensitive element is exposed to radiation. An array of pixels is synchronously exposed to radiation. Sampled values for a first exposure period can be read while the photo-sensitive element is exposed for a second exposure period.
CMOSIS nv | Date: 2011-03-02
An analog-to-digital converter (ADC) generates an output digital value equivalent to the difference between two analog signal values. The ADC
Agency: Cordis | Branch: H2020 | Program: ECSEL-RIA | Phase: ECSEL-01-2014 | Award Amount: 27.39M | Year: 2015
This project will research new technologies for CMOS image sensors that are needed in the next generation of several application domains. The image sensor research will focus on enhancing the capabilities of current imaging devices: New design (architectures) and technology (e.g. 3D stacking) for better pixels (lower noise, higher dynamic range, new functionality within the pixel) and more pixels (higher spatial and temporal resolutions) at higher speed, time-of-flight pixels, local (on-chip) image processing, embedded CCD in CMOS TDI pixels. Extended sensitivity and functionality of the pixels: extension into infrared, filters for hyper-and multi-spectral imaging, better colour filters, programmable filters with LCD cells. Application domains that will be covered are: Digital Lifestyle: Broadcast, Digital Cinema & Entertainment, Smart home (Grass Valley, Angenieux, Silios, Delft University of Technology, SoftKinetic) Smart Production (IMEC, C-cam) High-end Security (Adimec, Angenieux, Le2i, TNO) Agriculture and food sorting using hyper- and multi-spectral imaging and programmable filters (Silios, Le2i) Medical healthcare: diagnostics using multi-/hyper-spectral imaging and programmable filters (Adimec, TNO, Silios, Quest and Focal) Gas detection using multi spectral IR imagers (Sofradir) Security: gas sensing (Sofradir) The prototype CMOS image sensors for several application domains will be demonstrated together with the sensor related processing.