Calculadora de Ruido de Cuantización ADC

Calcula el ruido de cuantización, SNR teórico y densidad de ruido de un convertidor ADC de N bits.

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Fórmula

SQNR = 6.02N + 1.76 \text{ dB}, \quad LSB = \frac{V_{ref}}{2^N}

N — ADC resolution (bits)

SQNR — Signal-to-quantization-noise ratio (dB)

LSB — Least significant bit voltage (V)

V_ref — ADC reference voltage (V)

Cómo Funciona

Quantization noise is an inherent limitation in analog-to-digital conversion where continuous analog signals are transformed into discrete digital representations. When sampling a signal, an analog-to-digital converter (ADC) approximates the continuous signal's amplitude using a finite number of discrete levels, introducing quantization error. The quantization noise is a form of signal distortion that depends on the number of bits used in the analog-to-digital conversion process.

Ejemplo Resuelto

Problem: Calculate the Signal-to-Quantization Noise Ratio (SQNR) for an 8-bit ADC and determine the least significant bit (LSB) voltage if the reference voltage is 5V Solution: 1. SQNR Calculation: SQNR = 6.02 * 8 + 1.76 = 50.32 dB 2. LSB Calculation: LSB = 5V / (2^8) = 5V / 256 = 0.01953V 3. This means each quantization level represents approximately 19.53 mV

Consejos Prácticos

✓Use oversampling techniques to improve signal-to-noise ratio
✓Select ADC with appropriate bit resolution for your signal requirements
✓Consider dithering techniques to reduce quantization noise

Errores Comunes

✗Assuming higher sampling rate always improves quantization noise
✗Not accounting for reference voltage when calculating LSB
✗Neglecting the impact of bit resolution on signal-to-noise ratio

Preguntas Frecuentes

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