Charge mode active pixel sensor read-out circuit
First Claim
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1. 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.
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Abstract
An apparatus such as an imager includes groups of sensors each of which includes subgroups of sensors. Subgroup select circuits are coupled to outputs from respective subgroups of sensors, and group select circuits are coupled to outputs from subgroup select circuits associated with respective ones of the groups. A bus is coupled to receive outputs from the group select circuits. A controller can provide 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 from the sensors to the bus one sensor at a time.
60 Citations
23 Claims
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1. An apparatus comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of obtaining a readout of a pixel sensor array comprising:
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organizing pixel sensors of an array into groups comprising a plurality of subgroups of sensors, the outputs of each subgroup coupled to an associated subgroup select circuit and the outputs of each subgroup select circuit coupled to an associated group select circuit; selectively enabling a group select circuit and a subgroup select circuit to allow a signal from each sensor in said subgroup to pass sequentially and in a charge mode manner to a readout circuit electrically connected to said group select circuit; sensing a charge at the readout circuit; and selectively isolating from said readout circuit the groups of pixels not associated with the selectively enabled group select circuit by disabling the subgroup select circuits and group select circuits not associated with the selectively enabled group select circuit and applying a predetermined voltage to at least one first bus coupled to the disabled group select circuits by operating a switch coupled to the at least one first bus. - View Dependent Claims (20, 21, 22, 23)
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Specification