Adc Noise Floor Calculation

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Adc noise floor calculation.

Adisimadc the fft output can be used like an analog spectrum analyzer to measure the amplitude of the. For small analog input signals on the order of 35dbfs the thermal quantization noise power dominate the adc noise floor which is used to approximate the adc s effective noise figure nf. Fft noise floor 110db rms quantization noise level data generated using adisimadc figure 2. In this case the noise floor of the fft would be equal to the noise spectral density of the adc but the total noise power still has never changed.

Measure the snr of the adc in nyquist bandwidth usually 0 5db or 1db below fullscale normalize the converter s noise power to a 1hz bandwidth by simply subtracting 10log fs 2 from the snr value. Once the adc s nf is known the cascaded noise figure equation can be used to determine the overall receiver noise figure at the receiver input terminal. The same noise power is only spread across finer frequency bin widths as seen in figure 1.