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signalsadc

SNR of input signal of A/D converter

Hello i find this question. i am trying to solve it

My question is

12 bit ADC has input signal range of +-1V . the signal to quantization ratio if a sine wave signal with 0.25V peak voltage is given as input

I know that equation of SNR is 1.8+6n.

so I solved it.

For 12 bit ADC SNR must be 73.8 dB.

but solution is 62 dB.

so my answer is wrong. can you tell me why my answer is wrong??

Does peak voltage changes SNR??

Thanks

Solution

  • i got answer from this link

    https://electronics.stackexchange.com/questions/66261/signal-to-noise-ratio-problem

    SNR = 10Log((Vcc^2)/(Vpp^2))+1.8+6n

    so answer will be 62 dB