Patent ID: 7088394

Claim:
An apparatus comprising: groups of image sensors, each group comprising subgroups of sensors; subgroup select circuits, each of which is coupled to an output from a respective subgroup of sensors; group select circuits, each of which is coupled to outputs from subgroup select circuits associated with a respective one of the groups; a first bus for each group coupled to the outputs of the associated subgroup select circuits; a common output bus for receiving signals from each of the groups, the common output bus connected to the readout circuit; a controller for providing control signals to the subgroup select circuits and the group select circuits to selectively enable the respective subgroup select circuits and group select circuits to pass signals in a charge mode manner from the sensors to a readout circuit one sensor at a time; and a first isolation circuit coupled to each first bus for selectively isolating each group from the readout circuit, the first isolation circuit comprising a switch for selectively connecting the first bus to a predetermined voltage.