Thanks for the feedback. I will check with the foundry. However, +/-100mV does seem a lot to me. I would have thought that Vbe for a BJT
(not a parasitic one, but a proper one) would vary much less than that, less than +/- 50mV even. But, let's see.
Regards
Vivek
ACWWong wrote on Aug 10th, 2007, 4:09am:I would say no, if only beta max/min is available, then vbe variation is not modelled...
If you have the process variation measured data for vbe for fixed current, temperature & emitter area, then you could modify Is or emitter area to match the data you have. Without the process data, you would be guessing... you'd need to seek information from your foundry...
Anyway, although nominal (at fixed temperature) Is variation is typically quite large, its impact in my experience is generally less than temperature over say a range of +/- 50K from 300K (vbe would be ~ +/-100mV)... but again it depends on the process.