DESIGN AND FABRICATION OF A 64-QAM MODULATOR FOR ANALYSIS OF SIGNALS BETWEEN STAGES

Jorge Andrés Hernández Carrillo, José Ricardo Cárdenas Valdez, Virgilio Rosendo Pérez, Manuel de Jesús García Ortega, Andrés Calvillo Téllez

Resumen


Abstract

This paper proposes the design of a 64-QAM digital modulator on board based on chip technology, the developed board comprises two phase delay and two amplification stages , the modulator was developed using the software PCB Wizard and were established test points for each stage. The developed layout was built through a computer numerical control machine. Experimental results show a significant improvement of the accuracy based on a reached NMSE= -51 dB. The developed board offer a design tool for hardware developers where the intermodulation products can be evaluated, this digital modulator avoid parasitic inductances and capacitances between the lines. The results of the developed system are effective to add white Gaussian noise and probe the intermodulation products up to 3rd order that can be added, as well as the effect of spectral regrowth. The system is a hardware design tool able to show by stages the amplitude and phase changes that involves a 64-QAM modulation.

Keywords: CNC, Intermodulation, Layout, 64-QAM.


DISEÑO Y FABRICACIÓN DE UN MODULADOR DE 64 QAM PARA EL ANÁLISIS DE SEÑALES ENTRE ETAPAS


Resumen

Este trabajo propone el diseño de un modulador digital 64-QAM en tarjeta impresa basado en tecnología en chip, la tarjeta desarrollada consta de dos fases de retardo y dos fases de amplificación, el modulador fue desarrollado usando el software PCB Wizard y fueron establecidos puntos de prueba para cada etapa. El diseño desarrollado fue construido a través de una máquina de control numérico por computadora. Los resultados experimentales muestran una mejora significativa en la precisión alcanzada de NMSE de -51 dB. La tarjeta desarrollada ofrece una herramienta de diseño para desarrolladores de hardware donde los productos de intermodulación puedan ser evaluados, este modulador digital evita inductancias parásitas y capacitancias entre líneas. Los resultados del sistema desarrollado son efectivos para agregar ruido blanco Gaussiano y comprobar los los productos de intermodulación de hasta 3er orden que se pueden agregar, así como el efecto de recrecimiento espectral. El sistema es una herramienta de diseño de hardware capaz de mostrar por etapas los cambios en amplitud y fase que involucra una modulación de tipo QAM.

Palabras Claves: CNC, Diseño, Intermodulación, 64-QAM.


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Referencias


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