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AN1152

Title:
Achieving Higher ADC Resolution Using Oversampling
Name:
AN1152
Date:
01/22/2008
Author:
Jayanth Murthy Madapura
Description:
An Analog-to-Digital Converter (ADC) is an active interface between the analog and digital signal chains in an embedded system. An ADC converts analog signals into digital signals in electronic systems. The key feature of an ADC is the accuracy (resolution) it offers. The higher the desired accuracy, the higher the ADC cost. Higher ADC accuracy is achieved by designing hardware to quantize the analog signal amplitude into the digital signal with a higher code-word length. Practical ADCs have finite word lengths. To effectively strike a balance between system cost and accuracy, higher conversion accuracy is achieved by oversampling the low-resolution ADC integrated within a digital signal controller (DSC), and then processing the oversampled digital signal in software through a digital filter and a decimator. This processing scheme, which adds additional bits of accuracy to the 12-bit ADC conversion in a dsPIC® DSC, is explored in this application note.
Keywords:
ADC Resolution, Oversampling
 
Application Notes & Source Code
 Last Updated
Size
 
  AN1152
  01/22/2008
  337KB
  AN1152 Source Code
  01/10/2008
  60KB
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