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Author: Lionel Beneteau
Publisher:
ISBN:
Category :
Languages : fr
Pages : 222
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Book Description
LE CONVERTISSEUR ANALOGIQUE NUMERIQUE (CAN) EST L'INTERFACE INCONTOURNABLE ENTRE LE MONDE PHYSIQUE ET LE CIRCUIT DE TRAITEMENT NUMERIQUE DU SIGNAL. POUR DES APPLICATIONS QUI NECESSITENT UN FORT DEBIT OU UNE FORTE RESOLUTION, LA COMPLEXITE DU CAN EST LA PRINCIPALE LIMITATION A LA HAUTE INTEGRATION. L'OBJET DE CETTE ETUDE EST L'ANALYSE D'UN CAN QUI SATISFAIT LES DEUX CONTRAINTES A PRIORI CONTRADICTOIRES D'UNE FORTE RESOLUTION, ET D'UNE FAIBLE SENSIBILITE AUX IMPERFECTIONS ANALOGIQUES. APRES UNE ETUDE DES DIFFERENTS ETAGES DE LA CHAINE DE CONVERSION A/N, UNE ANALYSE DES GRANDES FAMILLES DE CAN MONTRE LA SUPERIORITE DES CODEURS SIGMA-DELTA SUR-ECHANTILLONNEES. UNE ANALYSE FREQUENTIELLE DE CES CODEURS ILLUSTRE COMMENT LEUR RESOLUTION POTENTIELLE EST FONCTION DE LA FREQUENCE D'ECHANTILLONNAGE ET DE LEUR COMPLEXITE. LE CODEUR SIGMA-DELTA GENERE DES IMPULSIONS DONT LA DENSITE EST L'IMAGE DU NIVEAU D'ENTREE. APRES UNE PRESENTATION DU FILTRE QUI RECONSTITUE UN MOT SUR N BITS A PARTIR DE CE TRAIN D'IMPULSIONS, UNE ANALYSE DU FONCTIONNEMENT TEMPOREL DU CODEUR PRESENTE SES PERFORMANCES POUR DES ENTREES DC ET AC. UNE ETUDE DES CONTRAINTES ANALOGIQUES D'IMPLEMENTATION TERMINE LE DOCUMENT.
Author: Lionel Beneteau
Publisher:
ISBN:
Category :
Languages : fr
Pages : 222
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Book Description
LE CONVERTISSEUR ANALOGIQUE NUMERIQUE (CAN) EST L'INTERFACE INCONTOURNABLE ENTRE LE MONDE PHYSIQUE ET LE CIRCUIT DE TRAITEMENT NUMERIQUE DU SIGNAL. POUR DES APPLICATIONS QUI NECESSITENT UN FORT DEBIT OU UNE FORTE RESOLUTION, LA COMPLEXITE DU CAN EST LA PRINCIPALE LIMITATION A LA HAUTE INTEGRATION. L'OBJET DE CETTE ETUDE EST L'ANALYSE D'UN CAN QUI SATISFAIT LES DEUX CONTRAINTES A PRIORI CONTRADICTOIRES D'UNE FORTE RESOLUTION, ET D'UNE FAIBLE SENSIBILITE AUX IMPERFECTIONS ANALOGIQUES. APRES UNE ETUDE DES DIFFERENTS ETAGES DE LA CHAINE DE CONVERSION A/N, UNE ANALYSE DES GRANDES FAMILLES DE CAN MONTRE LA SUPERIORITE DES CODEURS SIGMA-DELTA SUR-ECHANTILLONNEES. UNE ANALYSE FREQUENTIELLE DE CES CODEURS ILLUSTRE COMMENT LEUR RESOLUTION POTENTIELLE EST FONCTION DE LA FREQUENCE D'ECHANTILLONNAGE ET DE LEUR COMPLEXITE. LE CODEUR SIGMA-DELTA GENERE DES IMPULSIONS DONT LA DENSITE EST L'IMAGE DU NIVEAU D'ENTREE. APRES UNE PRESENTATION DU FILTRE QUI RECONSTITUE UN MOT SUR N BITS A PARTIR DE CE TRAIN D'IMPULSIONS, UNE ANALYSE DU FONCTIONNEMENT TEMPOREL DU CODEUR PRESENTE SES PERFORMANCES POUR DES ENTREES DC ET AC. UNE ETUDE DES CONTRAINTES ANALOGIQUES D'IMPLEMENTATION TERMINE LE DOCUMENT.
Author: Jacques Robert
Publisher:
ISBN:
Category :
Languages : fr
Pages : 185
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Book Description
Author: Nicolas Moeneclaey
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Book Description
Author: Michael J. Demler
Publisher: Elsevier
ISBN: 0080508138
Category : Technology & Engineering
Languages : en
Pages : 233
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Book Description
This book covers the theory and applications of high-speed analog-to-digital conversion. An analog-to-digital converter takes real-world inputs (such as visual images, temperature readings, and rates of speed) and transforms them into digital form for processing by computer. This book discusses the design and uses of such circuits, with particular emphasis on improving the speed of the conversion process and the accuracy of its output--how well the output is a corresponding digital representation of the output*b1input signal. As computers become increasingly interfaced to the outside world, "ADC" techniques will become ever more important.
Author: Dominique Placko
Publisher: John Wiley & Sons
ISBN: 1118613643
Category : Technology & Engineering
Languages : en
Pages : 369
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Book Description
This title presents the general principles of instrumentation processes. It explains the theoretical analysis of physical phenomena used by standard sensors and transducers to transform a physical value into an electrical signal. The pre-processing of these signals through electronic circuits – amplification, signal filtering and analog-to-digital conversion – is then detailed, in order to provide useful basic information. Attention is then given to general complex systems. Topics covered include instrumentation and measurement chains, sensor modeling, digital signal processing and diagnostic methods and the concept of smart sensors, as well as microsystem design and applications. Numerous industrial examples punctuate the discussion, setting the subjects covered in the book in their practical context.
Author: Chadi Jabbour
Publisher:
ISBN:
Category :
Languages : en
Pages : 189
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Book Description
Nowadays, communication devices are supporting an increasing number of standards. The diversity of the requirements in terms of speed and resolution, makes the design of a single low power analog to digital converter (ADC) suitable for all the scenarios very problematic. Reconfigurable ADCs are a solution to this problem, where resolution would be exchanged for bandwidth. Classical Delta Sigma ADCs offer an easy way to perform this exchange by adjusting their oversampling ratios. However, they are not suitable for wideband applications. Parallelizing Delta Sigma ADCs overcomes this problem and in addition, increases the reconfigurability of the ADC. In this work, a fully reconfigurable Time-interleaved Delta Sigma ADC is proposed. Its reconfigurability permits it to perform resolution-bandwidth trade-off as well as power consumptionbandwidth trade-off by adjusting the operation frequency, the number of active channels, the oversampling ratio and the modulator order. A novel interpolation technique is also proposed. It allows to downscale the capacitor sizes that may otherwise reach unreasonable values if large resolutions are required and relaxes the constraints on the anti-alias filter as well. A prototype of the presented Time-interleaved Delta Sigma ADC has been realized in a 1.2 V 65 nm CMOS technology. It was designed to fulfill the requirements of GSM, EDGE, UMTS, DVBT, WiFi and WiMax standards. For the GSM/EDGE scenario, a 80 dB SNR was measured. For the rest of scenarios, the performances were not secured but the functionality was tested successfully.
Author:
Publisher: Ed. Techniques Ingénieur
ISBN:
Category :
Languages : fr
Pages : 16
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Book Description
Author:
Publisher:
ISBN:
Category : Electronic apparatus and appliances
Languages : en
Pages : 652
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Book Description
Author: Mourad Loulou
Publisher:
ISBN:
Category :
Languages : fr
Pages : 194
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Book Description
APRES AVOIR DONNE LES BASES DE LA TECHNIQUE DES COURANTS COMMUTES COMME PRINCIPE DE CONCEPTION DE FONCTIONS ANALOGIQUES, LES FONDEMENTS DE LA CONVERSION ANALOGIQUE-NUMERIQUE SIGMA-DELTA SONT EXPLIQUES : SUR-ECHANTIONNAGE AVEC MISE EN FORME DU BRUIT DE QUANTIFICATION DANS LE MODULATEUR PUIS OBTENTION DE LA RESOLUTION SOUHAITEE GRACE AU FILTRAGE NUMERIQUE A DECIMATION. LES INTEGRATEURS SONT LES PIECES MAITRESSES DU MODULATEUR ; APRES AVOIR DECRIT DES SOLUTIONS POSSIBLES POUR REALISER CETTE FONCTION DEUX INTEGRATEURS ORIGINAUX SONT PROPOSES DANS LESQUELS LES DEFAUTS SONT COMPENSES NOTAMMENT L'INJECTION DE CHARGE. LORS DE LA CONCEPTION, L'ETAPE DE SIMULATION, PROBLEME DELICAT POUR LES CIRCUITS A TEMPS DISCRET, EST RESOLU PAR DEUX APPROCHES COMPLEMENTAIRES L'UNE FONCTIONNELLE, L'AUTRE COMPORTEMENTALE. ENFIN, DEUX REALISATIONS DE MODULATEURS DU SECOND ORDRE SONT DECRITES, ELLES PERMETTENT D'ATTEINDRE DES RESOLUTIONS DE 9 ET 10 BITS. LA SECONDE A DONNE LIEU A UNE CHAINE DE CONVERSION ANALOGIQUE-NUMERIQUE A SORTIE PARALLELE SUR 12 BITS.
Author: Hussein Adel
Publisher:
ISBN:
Category :
Languages : en
Pages : 177
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Book Description
High resolution wideband Analog-to-Digital Converters (ADCs) in communication systems are becoming an industrial target to provide consumers with high definition and high data rate services with high degree of flexibility. Technology advances enable high speed operation on the expense of a reduced analog resolution. To benefit from technology scaling and the accompanying digital enhancements, digital calibration can be used to leverage the analog resolution at high speed, and at lower area and power consumption.In this research, a study of the analog circuit limitations in pipeline ADCs and the possible digital calibration techniques are investigated. A foreground digital calibration technique has been applied on an 11-bit ADC prototype and measurement results prove the efficiency of digital calibration in restoring the linearity of the ADC. Design considerations for digitally calibrated ADCs are then presented and validated by system and circuit simulations to enable efficient mix between analog and digital for a highly robust digital calibration. A fast split background calibration is proposed and validated by system level simulations for pipeline ADCs. The proposed calibration technique is based on a fully deterministic approach to detect and correct the circuit errors, and thus it enables high accuracy with minimum calibration time reported in literature for a background technique. This technique is further extended for a fully deterministic split multi-stage calibration in pipeline ADCs. A circuit technique is proposed to eliminate the front-end sample and hold amplifier without sacrificing the accuracy of split ADC calibration at high frequencies.
