conceptos conversores ad da1
TRANSCRIPT
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DESPLIEGUE DE INFORMACION - Conversores (A/D) (D/A)
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Electrónica analógica
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Electrónica analógica
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Electrónica Digital
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Sistema Digital
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Sistema Digital
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SEÑALES ANALOGICAS
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Señal analógica
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SEÑALES DIGITALES
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Señal Digital
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Señal Digital
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Digitalización de una Señal
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Digitalización de una Señal
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Códigos Binarios
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Códigos Binarios
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Códigos Binarios
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Que es un C A/D
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Tipos de Entradas Analógicas
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Códigos Binarios de Salida
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Conversores A/D
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Criterios de Selección ADC
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Convertidor Flash o Paralelo
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Convertidor PipeLined
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Convertidor PipeLined
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Convertidor de Aproximaciones Sucesivas SAR
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Convertidor de Aproximaciones Sucesivas SAR
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Convertidor de Simple Rampa
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Convertidor de Doble Rampa
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Conversión Análogo-Digital (A/D) Doble Rampa
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Conversión Análogo-Digital (A/D)Doble Rampa
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Convertidor de Sigma Delta
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Conversión Análogo-Digital (A/D)Rampa en Escalera
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Conversión Análogo-Digital (A/D)De Seguimiento
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Conversión Análogo-Digital (A/D)De Seguimiento
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Conversión Análogo-Digital (A/D)De Pendiente Simple
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Conversión Análogo-Digital (A/D)Por Aproximaciones Sucesivas
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Conversión Análogo-Digital (A/D)Por Aproximaciones Sucesivas
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Convertidor A/D Resumen
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Conversión Digital-Analógico (D/A)
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Conversores A/D y D/A
• Magnitud analógica: Toma valores continuos en un determinado rango
• Magnitud digital: Toma valores de entre un conjunto de valores discretos “La conversión A/D tiene por objeto la transformación de un valor detensión o corriente analógico en un código binario de n bits”
Por tanto la operación a realizar será:
Muestreo de señales analógicas
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Cuantificación
Un conversor A/D representa el rango infinito de valoresanalógicos de entrada dentro de un rango limitado decódigos digitales de salida.
Conversores A/D y D/A
El proceso de conversión, convierte una señal analógica contínua en el
tiempo y en amplitud, en una señal digital, que es discreta en tiempo yamplitud.
Se produce por tanto un:
• Muestreo de la señal en el tiempo y una …
• Cuantificación de los valores de amplitud.
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Función de Transferencia ideal de un C A/D
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Cuantificación
Cada “paso” se define como 1 LSB, define en cuántas porciones se divide elrango completo de la señal analógica de entrada. Determina la resolución delconversor.
La resolución de un conversor D/A viene dada por el número de bits del códigodigital de salida.
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Error de Cuantificación
Al asignar un código de salida a cada valor de entrada analógica cometeremos un “error de cuantificación” en el proceso …
Este error estará comprendido entre ± ½ LSB:
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Muestreo
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Muestreo
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Muestreo de una Señal
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Muestreo de una Señal
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Ejemplo
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Ejemplo
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Conversión Digital-Analógico (D/A)
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Conversión Digital-Analógico (D/A)Con Ponderación Binaria
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Conversión Digital-Analógico (D/A)En Escalera
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Conversión Digital-Analógico (D/A)En Escalera
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Conversión Análogo-Digital (A/D)
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Conversión Análogo-Digital (A/D)Rampa en Escalera