Active pixel sensor cell with differential amplifier and array i

Details Active pixel sensor cell with differential amplifier and array i Active pixel sensor cell with differential amplifier and array i

1997-07-23

1999-07-13

Ho, Tuan V.

Television

Camera, system and detail

Solid-state image sensor

348308, H04N 5335

Patent

active

059233699

ABSTRACT:
An active pixel sensor cell array in which a differential amplifier (whose output is fed back to one of its inputs) amplifies the output of each cell. By using such differential amplifiers, fixed pattern noise in the image data generated by reading the array is reduced. Part of the differential amplifier for each cell is within the cell itself and a current source and tail current sink for the differential amplifier are implemented outside the cell and shared by all cells connected along a column of the array. Preferably, the output amplifier circuitry within each cell includes no PMOS transistor (although it typically includes NMOS transistors). Another aspect of the invention is an active pixel sensor cell including part of a differential amplifier (having an output fed back to one of its inputs, and configured to assert an amplified signal indicative of a sampled output voltage of the cell's photodiode), and circuitry (physically separate from the cell) implementing a remaining portion (e.g., a current source and tail current sink) of the differential amplifier.

REFERENCES:
patent: 5493423 (1996-02-01), Hosier
patent: 5541654 (1996-07-01), Roberts
patent: 5631704 (1997-05-01), Dickinson et al.
R.H. Nixon et al., "256.times.256 CMOS Active Pixel Sensor Camera-on-a-Chip," IEEE International Solid-State Circuits Conference, Session 11, Paper FA 11.1 (1996).

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