23 Dec '17, 4am

Learn about the basic MOSFET differential pair. #MOSFET #Engineering

Learn about the basic MOSFET differential pair. #MOSFET #Engineering

In real life, the current-source symbol would be replaced by a circuit that generates a constant current. (Refer to The Basic MOSFET Constant-Current Source for more information.) However, we want to keep things nice and simple for this introductory analysis, so in our simulations we’ll use an ideal current source instead of a constant-current circuit. An actual IC implementation of this circuit would replace the resistors with a current mirror functioning as an “active load.” However, if our goal is to understand the functionality of the differential pair, I think we should start with the resistor version. The differential pair is all about balance. Thus, for optimal performance the resistors and MOSFETs must be matched. This means that the channel dimensions of both FETs must be the same and that R1 must equal R2 . The resistance value chosen for the two resistors will b...

Full article: https://www.allaboutcircuits.com/technical-articles/the-b...

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