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The resolution of sin wave

Medya

 Hi

I do fft(using dft with N=1024 and set the input freq=100M*17/1024 ,strobperiode=10ns and simulation time>10240ns) on the output of the sin wave,and see that the noise floor is about -100db i repeat it for variuos step(strobperiode) and simtime but the noise floor doesn't vary more,I'm so confused that how can test the high resulotion adc with this low resolution wave,is the way to solve this problem

thanks

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  • Andrew Beckett

    By the way, I've just noticed your screen grab from your switch cap circuit (I didn't see that yesterday because I was only replying via email from a hand-held device). I'm wondering whether you've just not given enough time for the circuit to settle and hence you have not got a true period - maybe you need to give it longer and then take the last 10240ns for the FFT.

    That wouldn't explain why you don't get good results with the simple sine-source only though.

    Andrew.

Reply
  • Andrew Beckett

    By the way, I've just noticed your screen grab from your switch cap circuit (I didn't see that yesterday because I was only replying via email from a hand-held device). I'm wondering whether you've just not given enough time for the circuit to settle and hence you have not got a true period - maybe you need to give it longer and then take the last 10240ns for the FFT.

    That wouldn't explain why you don't get good results with the simple sine-source only though.

    Andrew.

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