| 1. |
- Lundgren, Jan, et al.
(författare)
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A power-line noise coupling estimation methodology for architectural exploration of mixed-signal systems
- 2003
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Ingår i: Proceedings of the Southwest Symposium on Mixed-Signa Design. - : IEEE Press. - 0780377788 ; , s. 133-137
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Konferensbidrag (refereegranskat)abstract
- This paper presents methods for early estimation of digital to analog noise coupling over the power distribution network in mixed-signal systems. The methods allow both behavioral verification of mixed-signal architectures and their sensitivity to noise coupling of the power distribution network. The behavioral level noise coupling simulation models are implemented as extensions to the SystemC system design language. To illustrate the effectiveness of the proposed methods, we have estimated the power distribution network noise for a photon-counting X-ray pixel array and compared this with SPICE simulations.
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| 2. |
- Oelmann, Bengt, et al.
(författare)
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Robust window discriminator for photon-counting pixel detectors
- 2002
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Ingår i: IEE Proceedings - Optoelectronics. - : Institution of Engineering and Technology (IET). - 1350-2433 .- 1359-7078. ; 149:2, s. 65-69
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Tidskriftsartikel (refereegranskat)abstract
- The paper proposes a robust and area-efficient way of designing window discriminators for photon-counting pixel detectors. For that, an all-digital window discriminator is proposed. It is event-driven and does not rely on any external or internal timing references, which makes it possible to use it over a wide range of specifications. In addition, it provides an overall area efficient implementation of the digital electronics in photon-counting pixel detectors. The transistor-level implementation of the circuit is presented with its circuit area and timing performance.
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| 3. |
- O'Nils, Mattias, et al.
(författare)
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Low Digital Interference Counter for Photon Counting Pixel Detectors
- 2002
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Ingår i: Nuclear Instruments and Methods in Physics Research, Section A. - 0168-9002. ; 487:3, s. 323-330
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Tidskriftsartikel (refereegranskat)abstract
- Single photon-counting pixel sensors are widely used in radiation imaging because of their energy resolving capability and high dynamic range. However, the close integration of the analog and digital circuits in the small pixel area puts critical constraints on the mixed mode circuit design. This includes the design considerations regarding the noise injection from the digital circuits into the analog part due to the digital switching. In addition, the large number of components requires a pixel circuit with low power consumption. In this paper, we address these two design constraints. An event counter architecture that decreases the digital switching and power consumption in a pixel is presented. The counter has the same dynamic range for capturing events and hardware cost as the conventionally used counters. We present design rules for adopting the counter architecture to a certain application. These rules enable the trade-off between readout accuracy from the pixel vs. the current in the digital parts of the pixel. Simulation of a case study circuit shows a reduction of digital activity by a factor seven, and a significant reduction of power consumption.
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