Hi,
Quote:I am curious, after your research what is the reason why you have low frequency noise on the output?
I came to the conclusion that the low frequency noise is inherent to randomization. I found several publications which report on that. Basically it makes sense: If you add dither to a system, the dither will typically also appear at the output.
However, since the DcDc-Output is further regulated by an additional LDO in my case, low frequency noise will be suppressed by the LDO.
Quote:I am also considering maybe using a low frequency sawtooth to modulate the duty cycle, but I am not sure how I should choose the freq of my sawtooth.
The choice of the switching frequency is related to your system (spectral interference planing). Often a low frequency is preferred, which however translated into a large inductor.
Cheers