Method and apparatus for measuring source follower gain in an image sensor array

摘要

Disclosed embodiments provide a method and apparatus for measuring the gain of output transistors of pixels in an imager device. Source/drain terminals of the output transistor and a reset transistor are driven with various input voltages to generate pixel output voltages. The slope of a line representing the relationship between the output voltages and the input voltages is determined. A component of the slope corresponding to gain not caused by the output transistor is removed from the slope to determine the gain of the output transistor.