olzanin
Member level 1
cadence transient noise
Hello,
I want simulate my first first order delta sigma ADC, attached schematic. I can simulate it and I see behind the LP again my input signal.
My problem is I cant see the noise shift to higher frequency. I simulate transient and adjust transient noise (noisefmin noisefmax and noisescale) measure it at the input (DFT) and compare with the output (DFT) but don't see shift to higher frequency, the noise isn't less on the output!
My question is:
1.) Can delta sigma with first order shift the noise or shall I design higher order?
2.) Is there some other way to simulate with noise or calculate the SNR on the input and on the output?
Thanks!
Olzanin
Hello,
I want simulate my first first order delta sigma ADC, attached schematic. I can simulate it and I see behind the LP again my input signal.
My problem is I cant see the noise shift to higher frequency. I simulate transient and adjust transient noise (noisefmin noisefmax and noisescale) measure it at the input (DFT) and compare with the output (DFT) but don't see shift to higher frequency, the noise isn't less on the output!
My question is:
1.) Can delta sigma with first order shift the noise or shall I design higher order?
2.) Is there some other way to simulate with noise or calculate the SNR on the input and on the output?
Thanks!
Olzanin