CMOS imaging system with low fixed pattern noise
First Claim
Patent Images
1. A CMOS imager system comprising:
- an active pixel sensor;
a column buffer connected to the active pixel sensor;
an analog-to-digital (A/D) converter co-located with the active pixel sensor and column buffer; and
an analog programmable gain amplifier connected between the column buffer and the A/D converter, such that a transmission path between the analog programmable gain amplifier and the A/D converter acts primarily as a resistance, rather than a reactance.
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Abstract
A CMOS imager system including an active pixel sensor having an access supply which provides distributed feedback, a column buffer (having gain and FPN suppression), and an A/D converter co-located with the sensor such that the effective transmission path between the column buffer (or optional analog PGA) and the A/D converter acts as a resistor, rather than a reactance. The system may further include both an analog gain amplifier stage and a digital programmable amplifier stage.
68 Citations
14 Claims
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1. A CMOS imager system comprising:
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an active pixel sensor; a column buffer connected to the active pixel sensor; an analog-to-digital (A/D) converter co-located with the active pixel sensor and column buffer; and an analog programmable gain amplifier connected between the column buffer and the A/D converter, such that a transmission path between the analog programmable gain amplifier and the A/D converter acts primarily as a resistance, rather than a reactance. - View Dependent Claims (2, 3, 4, 5)
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6. A digital video system comprising:
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an active pixel sensor; a column buffer connected to receive an output from the active pixel sensor; an analog programmable gain amplifier connected to the column buffer; an analog-to-digital (A/D) converter connected to the analog programmable gain amplifier and co-located with the active pixel sensor, column buffer and analog programmable gain amplifier, such that a transmission path between the analog gain amplifier and the A/D converter acts primarily as a resistance, rather than a reactance; a digital programmable gain amplifier connected to an output of the A/D converter; and a digital video interface connected to an output of the digital programmable gain amplifier. - View Dependent Claims (7, 8, 9, 10)
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11. A CMOS imager system comprising:
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an active pixel sensor; a column buffer connected to the active pixel sensor; a high-speed analog-to-digital (A/D) converter, the A/D converter having greater than or equal to 12 bit resolution, co-located with the active pixel sensor and supporting multiple column buffers; and an analog programmable gain amplifier connected between the column buffer and the A/D converter, such that a transmission path between the analog programmable gain amplifier and the A/D converter acts primarily as a resistance, rather than a reactance. - View Dependent Claims (12, 13, 14)
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Specification