Andrew Zonenberg
01/13/2022, 2:42 PMAndrew Zonenberg
01/13/2022, 2:43 PMAndrew Zonenberg
01/13/2022, 2:44 PMAndrew Zonenberg
01/13/2022, 2:44 PMTim 'mithro' Ansell
Tim 'mithro' Ansell
Andrew Zonenberg
01/13/2022, 11:49 PMAndrew Zonenberg
01/13/2022, 11:50 PMAndrew Zonenberg
01/17/2022, 11:01 PMAndrew Zonenberg
01/17/2022, 11:02 PMAndrew Zonenberg
01/17/2022, 11:02 PMTim 'mithro' Ansell
Andrew Zonenberg
01/18/2022, 6:42 PMAndrew Zonenberg
01/18/2022, 6:42 PMAndrew Zonenberg
01/18/2022, 6:42 PMAndrew Zonenberg
01/18/2022, 6:44 PMEric Smith
01/25/2022, 6:38 PMAndrew Zonenberg
01/26/2022, 5:17 AMAndrew Zonenberg
01/26/2022, 5:17 AMAndrew Zonenberg
01/26/2022, 5:17 AMAndrew Zonenberg
01/26/2022, 5:18 AMAndrew Zonenberg
01/26/2022, 5:18 AMAndrew Zonenberg
01/26/2022, 5:18 AMAndrew Zonenberg
01/26/2022, 5:19 AMTim 'mithro' Ansell
Tim 'mithro' Ansell
Kennedy Caisley
09/18/2022, 8:12 PMTim 'mithro' Ansell
Tim 'mithro' Ansell
John Kustin
01/22/2023, 11:44 PMsilicon_measurements/
The (limited) data shows a discrepancy between layout-extracted circuit simulation and measured silicon. The discrepancy is in the temperature coefficient of reference voltage output (see github: Output reference voltage vs. load and temperature and table: design goals vs. post-layout, extracted circuit performance). The discrepancy in temp co is 3.6 ppm (simulated) vs. 137.6 ppm (measured). Quite different.
My initial approach would be to dig into the BJT circuit model and investigate what could have caused this large difference. Iterate over (relevant) BJT model parameters, modify each one, and observe how each change either moves or doesn’t move the tempco from 3.6 ppm to 137.6 ppm. I am curious to hear the channel’s thoughts on what could be the source of this performance mismatch.
I’m hoping someone else has the time and interest to help find the answer. I think this could be a nice learning opportunity for myself but I just started graduate school and I fear I will forget about this question; sharing the question with you all helps me stay interested in answering it 🙂