Design and implementation of a 5-bit flash ADC for education

Abstract

The DSP (Digital Signal Processing) has many advantages over the analog processing. Therefore, with the recent advent of technology most of the signal processing tasks have been transferred from the analog to the digital domain. The ADCs (Analog to Digital Converter) provide a liaison between the real world analog signals and the digital processors. Therefore, ADCs become an elementary part of almost all modern electronic systems. This work focuses on the development of a simple Flash ADC for students demonstration purpose. In this context, a 5-Bit Flash ADC is implemented. Being designed for illustration purpose, the ADC has easily accessible inputs and outputs to each module. In order to keep the system cost effective with an ease of reimplementation. The low cost and easily market available discrete analog components are employed. The digital part is kept configurable with the help of a FPGA (Field Programmable Gate Array) based implementation. The digital circuit implementation is done via Verilog, a HDL (Hardware Description Language). The system implementation is described. Testing results are also presented. These results assure a proper functionality of the designed ADC.