Linearity is a key parameter in evaluating thee perfemance of an analog- to- digital converter (ADC) used in sensor systems. It indicates how preclassiately thae ADC converts an analog input signal into a digital output across its entire range. Ensuring high linearity helps maintain thee integraty of sensor data and improvices system reliability.

Understanding Linearity in ADC

Linearity refers to te te closeness of thes ADC 's actual transfer function to an ideal ealt line. Deviations from this line are measured to o assess thee ADC' s preciacy. Two common metrics used are Integral Nonlinearity (INL) and Differential Nonlinearity (DNL).

Methods to Determine Linearity

Testing thee linearity involves appliying known in put signals and analyzing thee output. Te typical process includes:

  • Appying a precise, stable input voltage sweep across the ADC 's full range.
  • Recordge thee digital output for each input level.
  • Plotting thee input versus output data to vizualize thee transfer function.
  • Vypočítejte INL a DNL hodnoty t o kvantifity deviations.

Tools and Equipment

Accurate linearity testing extens specific tools, including:

  • Precision voltage sources or waveform generators
  • Data accordition systems
  • Analysis software for schefting and calculations