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Session 2220

On the Development, Simulation and Testing of a Mixed-Signal Flash ADC with Application to a Digital Voltmeter

Cajetan M. Akujuobi

Center of Excellence for Communication Systems Technology Research (CECSTR) Electrical Engineering Department, Prairie View A&M University P.O. Box 2117, Prairie View, Texas 77446 Cajetan_Akujuobi@pvamu.edu

Abstract

The basic idea of a mixed signal system is explored in this work. A Flash Analog-to-Digital Converter (ADC) is developed, simulated and tested. Absolute accuracy error, offset error, gain error and differential non-linearity (DNL) are some of the tests conducted with successful results. A simulated version of the developed Flash ADC system was used to correlate results.

1. Introduction

About 25 years ago, the circuit discussed in this paper was only known as an Analog-to-Digital Converter (ADC) – Data converter. The terminology “Mixed-Signal System” was not thought of at that time. A mixed signal system can be defined as the interfacing system that connects the analog and the digital subsystems in any communication system. In effect, it interfaces the analog “world” with the digital “world”. In this paper, the basic idea of a flash ADC system is explored in the context of a mixed signal system. ADC is an electronic device, often an integrated circuit that converts an analog voltage to a digital value. Some of the most popular ADC types are: The parallel or flash, or simultaneous converter, the successive approximation, and the voltage-to- frequency converter [1], [2], [3], [4], and [5]. Different types offer varying resolution, accuracy and speed specifications.

A Flash ADC is developed, simulated and tested. Absolute accuracy errors, Offset errors, gain errors and differential non-linearity (DNL) are some of the tests conducted with successful results. In Section 2, we discussed the Flash ADC basics, in Section 3; the application to a digital voltmeter is discussed. In Sections 4, 5 and 6 we discussed the computer simulation, the physical model and testing work done respectively. Sections 7, 8 and 9 are the conclusions, references and acknowledgements respectively.

Proceedings of the 2003 American Society for Engineering Education Annual Conference & Exposition Copyright © 2003, American Society for Engineering Education

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Akujuobi, C. (2003, June), On The Development, Simulation, And Testing Of A Mixed Signal Flash Adc With Application To A Digital Voltmeter Paper presented at 2003 Annual Conference, Nashville, Tennessee. 10.18260/1-2--11637