5,407 research outputs found
Evolutionary Synthesis of Analog Electronic Circuits Using EDA Algorithms
DisertaÄnĂ prĂĄce je zamÄĹena na nĂĄvrh analogovĂ˝ch elektronickĂ˝ch obvodĹŻ pomocĂ algoritmĹŻ s pravÄpodobnostnĂmi modely (algoritmy EDA). PrezentovanĂŠ metody jsou na zĂĄkladÄ poĹžadovanĂ˝ch charakteristik cĂlovĂ˝ch obvodĹŻ schopny navrhnout jak parametry pouĹžitĂ˝ch komponent tak takĂŠ jejich topologii zapojenĂ. TĹi rĹŻznĂŠ metody vyuĹžitĂ EDA algoritmĹŻ jsou navrĹženy a otestovĂĄny na pĹĂkladech skuteÄnĂ˝ch problĂŠmĹŻ z oblasti analogovĂ˝ch elektronickĂ˝ch obvodĹŻ. PrvnĂ metoda je urÄena pro nĂĄvrh pasivnĂch analogovĂ˝ch obvodĹŻ a vyuĹžĂvĂĄ algoritmus UMDA pro nĂĄvrh jak topologie zapojenĂ tak takĂŠ hodnot parametrĹŻ pouĹžitĂ˝ch komponent. Metoda je pouĹžita pro nĂĄvrh admitanÄnĂ sĂtÄ s poĹžadovanou vstupnĂ impedancĂ pro ĂşÄely chaotickĂŠho oscilĂĄtoru. DruhĂĄ metoda je takĂŠ urÄena pro nĂĄvrh pasivnĂch analogovĂ˝ch obvodĹŻ a vyuĹžĂvĂĄ hybridnĂ pĹĂstup - UMDA pro nĂĄvrh topologie a metodu lokĂĄlnĂ optimalizace pro nĂĄvrh parametrĹŻ komponent. TĹetĂ metoda umoĹžĹuje nĂĄvrh analogovĂ˝ch obvodĹŻ obsahujĂcĂch takĂŠ tranzistory. Metoda vyuĹžĂvĂĄ hybridnĂ pĹĂstup - EDA algoritmus pro syntĂŠzu topologie a metoda lokĂĄlnĂ optimalizace pro urÄenĂ parametrĹŻ pouĹžitĂ˝ch komponent. Informace o topologii je v jednotlivĂ˝ch jedincĂch populace vyjĂĄdĹena pomocĂ grafĹŻ a hypergrafĹŻ.Dissertation thesis is focused on design of analog electronic circuits using Estimation of Distribution Algorithms (EDA). Based on the desired characteristics of the target circuits the proposed methods are able to design the parameters of the used components and theirs topology of connection as well. Three different methods employing EDA algorithms are proposed and verified on examples of real problems from the area of analog circuits design. The first method is capable to design passive analog circuits. The method employs UMDA algorithm which is used for determination of the parameters of the used components and synthesis of the topology of their connection as well. The method is verified on the problem of design of admittance network with desired input impedance function which is used as a part of chaotic oscillator circuit. The second method is also capable to design passive analog circuits. The method employs hybrid approach - UMDA for synthesis of the topology and local optimization method for determination of the parameters of the components. The third method is capable to design analog circuits which include also ac- tive components such as transistors. Hybrid approach is used. The topology is synthesized using EDA algorithm and the parameters are determined using a local optimization method. In the individuals of the population information about the topology is represented using graphs and hypergraphs.
Open-ended evolution to discover analogue circuits for beyond conventional applications
This is the author's accepted manuscript. The final publication is available at Springer via http://dx.doi.org/10.1007/s10710-012-9163-8. Copyright @ Springer 2012.Analogue circuits synthesised by means of open-ended evolutionary algorithms often have unconventional designs. However, these circuits are typically highly compact, and the general nature of the evolutionary search methodology allows such designs to be used in many applications. Previous work on the evolutionary design of analogue circuits has focused on circuits that lie well within analogue application domain. In contrast, our paper considers the evolution of analogue circuits that are usually synthesised in digital logic. We have developed four computational circuits, two voltage distributor circuits and a time interval metre circuit. The approach, despite its simplicity, succeeds over the design tasks owing to the employment of substructure reuse and incremental evolution. Our findings expand the range of applications that are considered suitable for evolutionary electronics
TAG: Learning Circuit Spatial Embedding From Layouts
Analog and mixed-signal (AMS) circuit designs still rely on human design
expertise. Machine learning has been assisting circuit design automation by
replacing human experience with artificial intelligence. This paper presents
TAG, a new paradigm of learning the circuit representation from layouts
leveraging text, self-attention and graph. The embedding network model learns
spatial information without manual labeling. We introduce text embedding and a
self-attention mechanism to AMS circuit learning. Experimental results
demonstrate the ability to predict layout distances between instances with
industrial FinFET technology benchmarks. The effectiveness of the circuit
representation is verified by showing the transferability to three other
learning tasks with limited data in the case studies: layout matching
prediction, wirelength estimation, and net parasitic capacitance prediction.Comment: Accepted by ICCAD 202
Vision technology/algorithms for space robotics applications
The thrust of automation and robotics for space applications has been proposed for increased productivity, improved reliability, increased flexibility, higher safety, and for the performance of automating time-consuming tasks, increasing productivity/performance of crew-accomplished tasks, and performing tasks beyond the capability of the crew. This paper provides a review of efforts currently in progress in the area of robotic vision. Both systems and algorithms are discussed. The evolution of future vision/sensing is projected to include the fusion of multisensors ranging from microwave to optical with multimode capability to include position, attitude, recognition, and motion parameters. The key feature of the overall system design will be small size and weight, fast signal processing, robust algorithms, and accurate parameter determination. These aspects of vision/sensing are also discussed
Automated synthesis of 8-output voltage distributor using incremental evolution
The automated synthesis of the analog electronic circuit, including both the topology and the numerical values for each of the circuitâs component, is recognized as a difficult problem. This problem is aggregating considerably when the size of a circuit and the number of its input/output pins increases. In this paper for the first time the method of automated synthesis of the analog electronic circuit by mean of evolution is applied to the synthesis of a multi-output circuit, namely 8-output voltage distributor, that distributes the incoming voltage signal among the outputs in filter-like mode. Using the substructure reuse, dynamic fitness function and incremental evolution techniques the
largest analogue circuit has been evolved in the area that has 138 components
Metodologia Per la Caratterizzazione di amplificatori a basso rumore per UMTS
In questo lavoro si presenta una metodologia di
progettazione elettronica a livello di sistema,
affrontando il problema della caratterizzazione dello spazio di progetto dell' amplificatore a basso rumore costituente il primo stadio di un front end a conversione diretta per UMTS realizzato in tecnologia CMOS con lunghezza di canale .18u. La metodologia è sviluppata al fine di valutare in modo quantititativo le specifiche ottime di sistema per il front-end stesso e si basa sul concetto di Piattaforma Analogica, che prevede la costruzione di un modello di prestazioni per il blocco analogico basato su
campionamento statistico di indici di prestazioni del blocco stesso, misurati tramite simulazione di dimensionamenti dei componenti attivi e passivi soddisfacenti un set di equazioni specifico della topologia circuitale. Gli indici di prestazioni vengono successivamente ulizzati per parametrizzare modelli comportamentali utilizzati nelle fasi di ottimizzazione a livello di sistema. Modelli comportamentali atti a rappresentare i sistemi RF sono stati pertanto studiati per ottimizzare la scelta delle metriche di prestazioni. L'ottimizzazione dei set di
equazioni atti a selezionare le configurazione di
interesse per il campionamento ha al tempo stesso richiesto l'approfondimento dei modelli di dispositivi attivi validi in tutte le regioni di funzionamento, e lo studio dettagliato della progettazione degli amplificatori a basso rumore basati su degenerazione induttiva. Inoltre,
il problema della modellizzazione a livello di sistema degli effetti della comunicazione tra LNA e Mixer è stato affrontato proponendo e analizzando diverse soluzioni. Il lavoro ha permesso di condurre un'ottimizzazione del front-end UMTS, giungendo a specifiche ottime a livello di sistema per l'amplificatore stesso
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