Calculadora de SNR de Convertidor ADC
Calcula el SNR teórico, ENOB y rango dinámico de convertidores analógico-digital (ADC).
Fórmula
SNR_ideal = 6.02·N + 1.76 dB; SNR_jitter = −20·log₁₀(2π·f_in·t_j)
Cómo Funciona
An Analog-to-Digital Converter (ADC) is a critical component in electronic systems that converts continuous analog signals into discrete digital representations. Signal-to-Noise Ratio (SNR) and Effective Number of Bits (ENOB) are key performance metrics that describe the quality and precision of an ADC. SNR measures the ratio of the desired signal power to the noise power, while ENOB quantifies the actual resolution of the converter by accounting for non-ideal characteristics like distortion and noise.
Ejemplo Resuelto
Consider an 8-bit ADC with a full-scale range of 5V. If the input signal is a 1 kHz sine wave with an amplitude of 2V peak-to-peak, and the measured total harmonic distortion (THD) is -50 dB, the calculation would proceed as follows: First, calculate the theoretical SNR (ideal case) as 6.02N + 1.76 dB (where N is the number of bits). For an 8-bit ADC, this would be 6.02 * 8 + 1.76 = 50.92 dB. Then, use the measured THD to determine the actual ENOB by comparing the ideal and actual SNR performance.
Consejos Prácticos
- ✓Always consider the full measurement bandwidth when calculating SNR
- ✓Use calibrated test equipment for accurate ADC performance characterization
- ✓Account for input signal frequency and amplitude variations
- ✓Consider temperature and environmental factors affecting ADC performance
Errores Comunes
- ✗Assuming ideal performance without accounting for real-world noise
- ✗Neglecting sampling rate and Nyquist criteria
- ✗Overlooking quantization errors in precision calculations
Preguntas Frecuentes
What is the difference between SNR and SINAD?
SNR typically measures signal power to noise power, while SINAD (Signal-to-Noise and Distortion) includes harmonic distortion in the noise measurement
How does bit depth affect ADC performance?
Higher bit depth increases resolution and dynamic range, reducing quantization noise and improving signal representation
What factors impact ADC signal-to-noise ratio?
Key factors include sampling rate, input signal frequency, reference voltage, circuit design, and environmental conditions
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