Dual conversion gain high dynamic range image sensor readout circuit memory storage structure

摘要

A readout circuit includes a comparator coupled to receive a ramp signal an output of a dual conversion gain pixel. A single counter is coupled to the output of the comparator. The counter is coupled to write to only one of a first or a second memory circuits at a time. A first multiplexor is coupled to load either an initial value or an initial memory value from the first memory circuit into the counter. A second multiplexor is coupled to load either a low conversion gain memory value from the first memory circuit or a high conversion gain memory value from the second memory circuit into a single data transmitter, which is coupled to transmit the received memory value to a digital processor.