Active pixel image sensor with reduced readout delay

Details Active pixel image sensor with reduced readout delay Active pixel image sensor with reduced readout delay

2006-08-31

2010-06-08

Epps, Georgia Y (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S208100, C348S308000

Reexamination Certificate

active

07732748

ABSTRACT:
Methods, devices, and systems for improving (i.e., reducing) the settling time of an output signal read from a photo sensor and improving the PSRR of the supply voltage are disclosed, wherein a detected charge in a pixel is converted to a voltage and drives a source follower transistor. A bias transistor is coupled in series with the source follower transistor and includes an output therebetween. The bias transistor is driven to source a reduced current when the voltage results from a readout of a reset value of the pixel and the bias transistor is driven to source an enhanced current when the voltage results from a readout of a sensed signal value.

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