Hello Team,
Customer is asking if there is a negative input voltage vs. Input current curve as attached shown. and is there similar application node available?
LM339 is a Bipolar process, and LMC6762 is CMOS process. customer would like to know what the curve of VIN vs. Input current looks like with CMOS process?
Hello Brian,
Bipolar inputs have a definite current direction due to the base current. NPN's usually have current going *in* the pin, and PNP's have current coming out the pin.
See the LMV841 datasheet, figures 7 to 9, for a typical example of a CMOS input
CMOS currents can be positive or negative as the "bias" currents are actually the result of the matching of ESD diode leakages.
You can see in the figures, as you approach either rail, the "balance" is lost as one diode starts pinching off and the "balance" is lost and the current skews that direction.
The lowest bias current is at mid-supply.
Also see the TI precision labs presentation of bias currents:
