Testing Various Dynamic Parameters of ADC

Comprehensive evaluation of ADC performance requires testing key dynamic parameters including signal-to-noise and distortion ratio (SNDR), total harmonic distortion (THD), spurious-free dynamic range (SFDR), effective number of bits (ENOB), integral nonlinearity (INL), and differential nonlinearity (DNL). Implementation typically involves applying coherent sampling techniques with prime-record-length FFT analysis, where parameters are calculated using specialized algorithms: SNDR computation compares fundamental signal power against all other spectral components, THD analyzes harmonic distortion ratios, SFDR measures the distance between fundamental and largest spurious tone, while INL/DNL require histogram-based testing with precise ramp signals. Each parameter provides distinct performance insights - SNDR reflects overall dynamic performance, THD reveals nonlinear distortion characteristics, SFDR identifies spur limitations, ENOB converts SNDR to effective resolution, and INL/DNL quantify linearity errors. Critical implementation considerations include ensuring adequate sampling record length (minimum 4096 points recommended), proper windowing functions (such as Hanning or Flat-Top windows), and coherent sampling to avoid spectral leakage. These parameters should be analyzed collectively rather than in isolation, as they provide complementary perspectives on ADC performance characteristics and potential improvement areas.