US20130015323: Image Sensor with a Charge-Based Readout Circuit
Sayuk, Mark T. (Reading, MA, US)
Decker, Steven J. (Sandown, NH, US)
Filed: 06/13/2012
The proposal is to use passive caps per column to sample reset and signal data, then multitude of such caps can be connected to a single op-amp for read:
Another image sensor related patent from Analog Devices was published in Sept. 2012:
US20120236187: Apparatus and Method for Image Decimation for Image Sensors
Guthrie, Edward (Boston, MA, US)
Sase, Masatoshi (US)
Decker, Steven (Sandown, NH, US)
Nakamura, Katsu (Andover, MA, US)
Filed: 03/16/2011
This application talks about a multitude of column-level sampling caps arrangement for the binning in readout analog domain.
