公开(公告)号：GB2481970A8

公开(公告)日：2012-02-22

申请号：GB201011385

申请日：2010-07-06

Applicant: ST MICROELECTRONICS RES & DEV LTD

Inventor： STORM GRAEME ,  PURCELL MATTHEW

IPC: H04N5/217

公开(公告)号：GB2481970A

公开(公告)日：2012-01-18

申请号：GB201011385

申请日：2010-07-06

Applicant: ST MICROELECTRONICS RES & DEV LTD

Inventor： STORM GRAEME ,  PURCELL MATTHEW

IPC: H04N5/217

Abstract: The sensor provides for an image sensor comprising: an array of pixels, each pixel having at least one photo-sensitive element; readout circuitry for receiving an analogue signal from each pixel at a first time and at a second time, between which the analogue signal changes; and associated support circuitry. The signal level at both first and second times comprises noise resultant from said pixel, and the support circuitry is a source of time variant noise on the sensor output. So, sample and hold circuitry is provided to maintain substantially level at least a proportion of this support circuitry noise. The proportion is time-invariant at the sensor output between the first time and the second time. The sample and hold circuitry may include switches 50 and a sampling capacitor 52. The support circuitry may include a regulator circuit and/or a current source. The sensor could find application in cameras and mobile phones.