Image capture system including multipurpose photodetector
First Claim
1. A system for image capture, comprising:
- a unit cell comprising;
a capacitor transimpedance amplifier (CTIA) subcircuit;
a source follower per detector (SFD) subcircuit; and
a direct injection (DI) subcircuit;
wherein the unit cell operates using one of the CTIA subcircuit, the SFD subcircuit, or the DI subcircuit selected in response to a control signal; and
a column amplifier coupled to the unit cell, the column amplifier operable to;
receive an intermediate signal from the unit cell;
couple components of the column amplifier corresponding to the selected subcircuit in response to the control signal; and
generate an output signal from the intermediate signal using the coupled components of the column amplifier.
1 Assignment
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Accused Products
Abstract
In certain embodiments, a system is provided for image capture that includes a unit cell that includes a Capacitor TransImpedance Amplifier (CTIA) subcircuit, a Source Follower per Detector (SFD) subcircuit, and a Direct Injection (DI) subcircuit. The unit cell may operate using one of the subcircuits selected in response to a control signal. A column amplifier may be coupled to the unit cell. The column amplifier may be operable to receive an intermediate signal from the unit cell and couple components of the column amplifier corresponding to the selected subcircuit in response to the control signal. The column amplifier may generate an output signal from the intermediate signal using the coupled components of the column amplifier.
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Citations
14 Claims
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1. A system for image capture, comprising:
- a unit cell comprising;
a capacitor transimpedance amplifier (CTIA) subcircuit; a source follower per detector (SFD) subcircuit; and a direct injection (DI) subcircuit; wherein the unit cell operates using one of the CTIA subcircuit, the SFD subcircuit, or the DI subcircuit selected in response to a control signal; and a column amplifier coupled to the unit cell, the column amplifier operable to; receive an intermediate signal from the unit cell; couple components of the column amplifier corresponding to the selected subcircuit in response to the control signal; and generate an output signal from the intermediate signal using the coupled components of the column amplifier.
- a unit cell comprising;
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2. A system for image capture comprising:
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a unit cell comprising; a capacitor transimpedance amplifier (CTIA) subcircuit; a source follower per detector (SFD) subcircuit; and a direct injection (DI) subcircuit; wherein the unit cell operates using one of the CTIA subcircuit, the SFD subcircuit, or the DI subcircuit selected in response to a control signal; and a column amplifier coupled to the unit cell, the column amplifier operable to; receive an intermediate signal from the unit cell; couple components of the column amplifier corresponding to the selected subcircuit in response to the control signal; and generate an output signal from the intermediate signal using the coupled components of the column amplifier; wherein the column amplifier comprises; a first amplifier; a current source; a second amplifier; a first switch coupled to the input of the first amplifier; a second switch coupled to the output of the first amplifier; a third switch coupled to the current source; a fourth switch coupled to input of the second amplifier; and a fifth switch coupled to the output of the second amplifier;
wherein the first, third, and fourth switches are coupled to the unit cell; and
wherein the second and fifth switches are coupled to an output node.
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3. A system for image capture comprising:
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a unit cell comprising; a capacitor transimpedance amplifier (CTIA) subcircuit; a source follower per detector (SFD) subcircuit; and a direct injection (DI) subcircuit; wherein the unit cell operates using one of the CTIA subcircuit, the SFD subcircuit, or the DI subcircuit selected in response to a control signal; and a column amplifier coupled to the unit cell, the column amplifier operable to; receive an intermediate signal from the unit cell; couple components of the column amplifier corresponding to the selected subcircuit in response to the control signal; and generate an output signal from the intermediate signal using the coupled components of the column amplifier; wherein the CTIA subcircuit comprises; a first transistor; a second transistor; a cascode transistor; a feedback capacitor; an enable transistor; and a reset transistor; wherein the first transistor and cascode transistors are coupled in series, and the second transistor, the feedback capacitor, the reset transistor, the cascode transistor, and the enable transistor are coupled to a common node. - View Dependent Claims (4, 5, 6)
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7. A system of for image capture comprising:
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a unit cell comprising; a capacitor transimpedance amplifier (CTIA) subcircuit; a source follower per detector (SFD) subcircuit; and a direct injection (DI) subcircuit; wherein the unit cell operates using one of the CTIA subcircuit, the SFD subcircuit, or the DI subcircuit selected in response to a control signal; and a column amplifier coupled to the unit cell, the column amplifier operable to; receive an intermediate signal from the unit cell; couple components of the column amplifier corresponding to the selected subcircuit in response to the control signal; and generate an output signal from the intermediate signal using the coupled components of the column amplifier; wherein the SFD subcircuit comprises; a first transistor; a second transistor; a cascode transistor; an enable transistor; and a reset transistor;
wherein the first transistor is coupled to a second transistor, the first transistor and cascode transistors are coupled in series, andwherein the reset transistor, the cascode transistor, the second transistor and the enable transistor are coupled to a common node. - View Dependent Claims (8, 9, 10)
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11. A system of for image capture comprising:
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a unit cell comprising; a capacitor transimpedance amplifier (CTIA) subcircuit; a source follower per detector (SFD) subcircuit; and a direct injection (DI) subcircuit; wherein the unit cell operates using one of the CTIA subcircuit, the SFD subcircuit, or the DI subcircuit selected in response to a control signal; and a column amplifier coupled to the unit cell, the column amplifier operable to; receive an intermediate signal from the unit cell; couple components of the column amplifier corresponding to the selected subcircuit in response to the control signal; and generate an output signal from the intermediate signal using the coupled components of the column amplifier; wherein the DI subcircuit comprises; a transistor;
an integration capacitor;an enable transistor; and a reset transistor; wherein the transistor, the integration capacitor, the enable transistor, and the reset transistor are coupled to a common node. - View Dependent Claims (12, 13, 14)
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Specification