REV 2 BUILD & PRE-AMP CHARACTERIZATION: This week, I partially assembled our newly-arrived Rev 2 boards, building out a complete pre-amp channel. This allowed me to finally characterize the BARI pre-amp for gain flatness and THD, though the limited test equipment available prevented me from characterizing it to a high degree of precision. For details, see the final presentation slides to be presented on Mon/Weds.
A representative curve can be seen below, demonstrating the input and output signals and spectra for a ~200 mV, 1 kHz signal. A Blackman window is used, improving the spectrum dynamic range as compared to last week.
I am currently working with Xingran to debug sources of noise in the analog/digital domains and devise appropriate mitigation strategies. This work will continue through the next week, in parallel to other integration efforts.