Berti
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Hi all,
About this kind of question I was also thinking about several times. As the common-mode usually doesn't draw static/differential-current, there is no need for a buffer. But is it better to use resistors or transistors for the voltage divider?
Resistors show better matching, but usually the common-mode voltage doesn't need to be very accurate. On the other hand, I think that two diode connected transistors will provide more current when the common-mode voltage leaves the middle point. Therefore providing a more stable voltage with lower quiesent current compared to two resistors where the current is always constant.
What do you think?
Regards
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