FFT simulation

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the8thhabit

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Hi, I am currently conducting an FFT simulation for a 3-bit Flash ADC with a sampling rate of 10MHz, but I am encountering significant spectral leakage that degrades performance. I have used 2048 sampling points and ensured that the sampling period is a multiple of the signal's period. Despite these precautions, the spectral leakage remains an issue. I would appreciate any guidance on additional measures I can take to fix this problem. I am curious whether the issue lies with the circuit, such as the preamplifier or comparator, or if it is related to the setup of the FFT simulation.

Thanks!
 

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the8thhabit said:
significant spectral leakage that degrades performance
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What does this mean in numbers?

the8thhabit said:
I am curious whether the issue lies with the circuit, such as the preamplifier
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How can we use this information to help you? We don´t have a clue about your circuit.

the8thhabit said:
or if it is related to the setup of the FFT simulation.
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The same. We don´t see your setup?

We also don´t see the input values (at least a part) of the FFT.

And we don´t know about your hardware test setup. Maybe the input is left floating, maybe it is grounded, maybe it is driven with a test signal...

Klaus
 

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--- Updated ---

Spectral leakage is shown in this picture.
I want to get ENOB about almost 3 bit. What should I do?
 

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