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Using SpectrumMeas to calculate ENOB

HaneenSu

Hi,

I have an ADC which I wish to calculate the ENOB for it. My differential input is a sine wave with 2 frequencies: 8MHz and 12 MHz. My sampling frequency is 50 MHz. My output signal full scale is upto 1.2V. I ran a pss simulation. I plotted the differential output voltage vs time, and on that output I wish to use it as an input for the sapectrumMeas function.

I did the following using the calculator tool:

spectrumMeas((vtime('pss "/net7") - vtime('pss "/net8")) 100n 500n nil 256 0 nil "Hamming" 1.2 "enob" )

where 256 is the number of noise bins. When I change this parameter, the ENOB changes dramatically.

For number of noise bins = 2 --> ENOB= 4.423

For number of noise bins = 256 --> ENOB= 12.38

Would someone help me understand what does the number of noise bins represents?

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