Image sensor device with first and second source followers and related methods

摘要

An image sensor device may include an array of image sensing pixels arranged in rows and columns. Each image sensing pixel may include an image sensing photodiode, a first source follower transistor coupled to the image sensing photodiode, and a switch coupled to the image sensing photodiode. Each image sensor device may include a second source follower transistor coupled to the switch, and a row selection transistor coupled to the first and second source follower transistors.

主权项

1. An image sensor device comprising:
an array of image sensing pixels arranged in rows and columns, each image sensing pixel comprising
an image sensing photodiode,a first source follower transistor coupled to said image sensing photodiode,at least one switch coupled to said image sensing photodiode,a second source follower transistor coupled to said at least one switch,a row selection transistor coupled to the first and second source follower transistors,a transfer transistor coupled between said image sensing photodiode and said at least one switch, anda reset transistor coupled between a second reference voltage and said transfer transistor, said at least one switch comprising
a third transistor having a first conduction terminal coupled to said second source follower transistor and a second conduction terminal coupled to said transfer transistor, anda fourth transistor coupled to said third transistor.