NikosTS
Advanced Member level 4
Hello there,
I am doing a transient analysis on a 3rd order SD modulator ( MASH topology ) and i want to plot the power spectrum of the quantization noise.
Thing is, that i am confused on how to do that.
My first try was sending the output sequence to Measurement tab---> Spectrum and ploting the curve.
My second try was sending the output sequence to the calculator and using the psd() function , afterwards use db10() function and finally plotting.
The 2 above mentioned curves have the same slope but a constant difference between them of about 40 dB ( e.g the first curve has peak at -20 dB and the second at -60 dB).
Could you enlighten me as to which is the correct way?
Thank you
I am doing a transient analysis on a 3rd order SD modulator ( MASH topology ) and i want to plot the power spectrum of the quantization noise.
Thing is, that i am confused on how to do that.
My first try was sending the output sequence to Measurement tab---> Spectrum and ploting the curve.
My second try was sending the output sequence to the calculator and using the psd() function , afterwards use db10() function and finally plotting.
The 2 above mentioned curves have the same slope but a constant difference between them of about 40 dB ( e.g the first curve has peak at -20 dB and the second at -60 dB).
Could you enlighten me as to which is the correct way?
Thank you