Patent ID: 8587708
Filing Date: 2013-11-19
Classification: H04N

Abstract:
1. An image sensor for capturing images of a scene, comprising: an array of image sensor pixels each having a photosensitive element and a source-follower transistor; a plurality of output voltage lines that each receive output voltages from a column of the source-follower transistors in the array; and a plurality of configurable current source transistors, each configurable current source transistor being coupled to a respective one of the output voltage lines, wherein each configurable current source transistor is operable in a first mode in which the configurable current source transistor has a first transconductance and produces a first amount of current and a second mode in which the configurable current source transistor has a second transconductance and produces a second amount of current, wherein the first transconductance is less than the second transconductance, and wherein the first amount of current is substantially the same as the second amount of current.