LMP7731 is the input transistor NPN or PNP whichever?
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LMP7731 is the input transistor NPN or PNP whichever?
Hello Masashi,
It has both...
It is a standard Rail-to-Rail bipolar input stage, so it has both NPN and PNP input pairs.
The NPN pair is on from V+ down to about 1V above V-, where it switches to the PNP pair to V-.
Regards,
Another clue is from an Input Bias Current vs. Common Mode Input Voltage graph.
When the NPN is active, as it will for positive (in respect to mid-supply) input voltage, the input bias current is positive.
When the PNP is active, as it will for negative (again, in respect to mid-supply) input voltage, the input bias current is negative.
Although, the LMP7731 seems to be opposite. Did someone flip a meter during characterization?
-Ken