3,234 research outputs found
A mixed-signal fuzzy controller and its application to soft start of DC motors
Presents a mixed-signal fuzzy controller chip and its application to control of DC motors. The controller is based on a multiplexed architecture presented by the authors (1998), where building blocks are also described. We focus here on showing experimental results from an example implementation of this architecture as well as on illustrating its performance in an application that has been proposed and developed. The presented chip implements 64 rules, much more than the reported pure analog monolithic fuzzy controllers, while preserving most of their advantages. Specifically, the measured input-output delay is around 500 ns for a power consumption of 16 mW and the chip area (without pads) is 2.65 mm/sup 2/. In the presented application, sensed motor speed and current are the controller input, while it determines the proper duty cycle to a PWM control circuit for the DC-DC converter that powers the motor drive. Experimental results of this application are also presented.Comisión Interministerial de Ciencia y Tecnología TIC99-082
Radiation Risks and Mitigation in Electronic Systems
Electrical and electronic systems can be disturbed by radiation-induced
effects. In some cases, radiation-induced effects are of a low probability and
can be ignored; however, radiation effects must be considered when designing
systems that have a high mean time to failure requirement, an impact on
protection, and/or higher exposure to radiation. High-energy physics power
systems suffer from a combination of these effects: a high mean time to failure
is required, failure can impact on protection, and the proximity of systems to
accelerators increases the likelihood of radiation-induced events. This paper
presents the principal radiation-induced effects, and radiation environments
typical to high-energy physics. It outlines a procedure for designing and
validating radiation-tolerant systems using commercial off-the-shelf
components. The paper ends with a worked example of radiation-tolerant power
converter controls that are being developed for the Large Hadron Collider and
High Luminosity-Large Hadron Collider at CERN.Comment: 19 pages, contribution to the 2014 CAS - CERN Accelerator School:
Power Converters, Baden, Switzerland, 7-14 May 201
Memory and information processing in neuromorphic systems
A striking difference between brain-inspired neuromorphic processors and
current von Neumann processors architectures is the way in which memory and
processing is organized. As Information and Communication Technologies continue
to address the need for increased computational power through the increase of
cores within a digital processor, neuromorphic engineers and scientists can
complement this need by building processor architectures where memory is
distributed with the processing. In this paper we present a survey of
brain-inspired processor architectures that support models of cortical networks
and deep neural networks. These architectures range from serial clocked
implementations of multi-neuron systems to massively parallel asynchronous ones
and from purely digital systems to mixed analog/digital systems which implement
more biological-like models of neurons and synapses together with a suite of
adaptation and learning mechanisms analogous to the ones found in biological
nervous systems. We describe the advantages of the different approaches being
pursued and present the challenges that need to be addressed for building
artificial neural processing systems that can display the richness of behaviors
seen in biological systems.Comment: Submitted to Proceedings of IEEE, review of recently proposed
neuromorphic computing platforms and system
On-line Testing Field Programmable Analog Array Circuits
This work presents an efficient methodology to on-line test field programmable analog array (FPAA) circuits. It proposes to partition the FPAA circuit under test into sub circuits. Each sub circuit is tested by replicating the sub circuit with programmable resources on FPAAs, and comparing the outputs of the original partitioned sub circuit and its replication. The advantages of this approach includes: low implementation cost, enhanced testability, and flexible testing schedules. This work also presents circuit techniques to address stability problems which are often encountered in the proposed on-line testing approach. In addition, the impact of performing circuit partition on testability is investigated in this work. It shows that testability is generally improved in partitioned circuits. Finally, experimental results are presented to demonstrate the feasibility and effectiveness of the proposed techniques
Developing large-scale field-programmable analog arrays for rapid prototyping
Field-programmable analog arrays (FPAAs) provide a method for rapidly prototyping analog systems. While currently available FPAAs vary in architecture and interconnect design, they are often limited in size and flexibility. For FPAAs to be as useful and marketable as modern digital reconfigurable devices, new technologies must be explored to provide area efficient, accurately programmable analog circuitry that can be easily integrated into a larger digital/mixed signal system. By leveraging recent advances in floating gate transistors, a new generation of FPAAs are achievable that will dramatically advance the current state of the art in terms of size, functionality, and flexibility
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