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You'll want to take a look at chapter 32 of the MK20DX256 reference manual: The comparator (CMP) module provides a circuit for comparing two analog input voltages. The comparator circuit is designed to operate across the full range of the supply voltage, known as rail-to-rail operation. The Analog MUX (ANMUX) provides a circuit for selecting an analog input ...


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One of the negative inputs to one of the LM339 is possibly shorted to the positive power supply. I am assuming it worked then just failed. There is a possibility that line is shorted to +. The other possibility I see is R5 is shorted to +.


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In an ideal world, your circuit would indeed not put out any differential voltage between points X and Y because it is fully symmetrical. There are no random offsets in SPICE, it does exactly what you tell it to do. However, SPICE isn't perfect - it uses floating-point numbers and therefore necessarily has rounding errors. These rounding errors get amplified ...


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Your model is incorrect. The offset voltage source, as you've modeled, is an actual input you're providing. In reality, offsets result from the parameter spread and non-ideal behavior of the transistors making up the device. So, "fixing" the offset that is created by the inherent properties of the real devices used, requires to have a model where ...


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