Adc Noise Floor Measurement

To measure the amount of input referred noise the input of the adc is either grounded or connected to a heavily decoupled voltage source and a large number of output samples are collected and plotted as a histogram referred to as a grounded input histogram if the input is nominally at zero volts. 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. In practice however the noise floor will always be higher than this due to electronic noise.

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For example the noise floor of a 16 bit measurement system can never be better than 96db and for a 24 bit system the lower limit is limited to 144 db.

Adc noise floor measurement.

Fft noise floor 110db rms quantization noise level data generated using adisimadc figure 2. Determine the thermal quantization noise floor level in dbm either from the component vendor s data sheet or by measurement for a small signal input level on the order of 35dbfs. Calculate the normalized noise floor level in 1hz bandwidth by subtracting 10 log f sample 2 where f sample is given in units of hz. We want to measure the noise floor of my adc ads61b29 12 bit 50msps.

Experiment setup details. Adisimadc the fft output can be used like an analog spectrum analyzer to measure the amplitude of the. Fft output for an ideal 12 bit adc input 2 111mhz f s 82msps average of 5 ffts m 8192 data generated from. This is split into 2 experiments.

The noise floor of a measurement system is also limited by the resolution of the adc system. Two s complement enabled in adc. Calculate the input noise of the converter which is the theoretical thermal noise floor limit ktb 174dbm at room temperature. Since the noise is approximately gaussian.

For that we terminated the input of adc and captured the digital samples using fpga. We are having some doubts in the calculation.

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