ISL21090B75

AI 生成的摘要: Bandgap voltage references generate stable output voltages by combining two temperature-dependent voltages to cancel temperature drift, typically around 1.24V. They operate with low voltage (<5V), low current (<1mA), and moderate temperature drift (>20ppm/°C). Buried Zener references offer low noise and temperature drift but require higher voltage (>7V) and current (>1.5mA). Intersil Floating Gate Analog technology stores precise voltages on a floating gate, achieving very low temperature drift (1ppm/°C), high accuracy, and ultra-low current (<1µA). Key specs include absolute accuracy and temperature coefficient, with advanced methods to measure and reduce drift.

AI 生成的摘要: Effective Number of Bits (ENOB) depends critically on precise coherence in A/D sampling, with small frequency shifts significantly impacting accuracy. Unwrapping reconstructs coherently sampled sine waves, while windowing controls spectral leakage by shaping the acquisition window. Resampling and interpolation adjust sample sets to avoid leakage in FFT analysis. Different window functions balance side lobe levels and bandwidth, affecting spectral resolution and leakage reduction.

AI 生成的摘要: Coherent sampling requires the ratio of signal frequency to sampling frequency to be a rational number, expressed as ko/N. When this condition is not met, frequency smearing occurs across bins. Data Acquisition Systems (DAS) can mitigate this by windowing, fixing sampling frequency and tuning input frequency, or fixing input frequency and tuning sampling frequency. The latter two methods are practical for most systems. Pseudo-code illustrates the frequency response for non-integer ko values.