Dear all,

  I might have a silly question. I am trying to measure SNR of a sigma delta modulator (continuous time). Normally the SNR is around 60dB. I am wondering if the noise (thermal or whatever) from the signal generator could be negligible in this case. The signal frequency is around 500KHz. ( I mean if the noise from the signal generator is usually much smaller than the noise shaped quantization noise, so I don't need to do some correction to get rid of the signal generator noise when I measure the SNR. )
 Thank you for your time.