发明授权
- 专利标题: Image sensor ADC and CDS per column
- 专利标题(中): 图像传感器ADC和CDS每列
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申请号: US12421948申请日: 2009-04-10
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公开(公告)号: US07903159B2公开(公告)日: 2011-03-08
- 发明人: Jeffrey J. Zarnowski , Ketan V. Karia , Thomas Poonnen , Michael E. Joyner
- 申请人: Jeffrey J. Zarnowski , Ketan V. Karia , Thomas Poonnen , Michael E. Joyner
- 申请人地址: US NY Homer
- 专利权人: Panavision Imaging LLC
- 当前专利权人: Panavision Imaging LLC
- 当前专利权人地址: US NY Homer
- 代理商 Bernhard P. Molldrem, Jr.
- 主分类号: H04N3/14
- IPC分类号: H04N3/14 ; H04N5/335
摘要:
A solid state imager converts analog pixel values to digital form on an arrayed per-column basis. A counter is coupled to an N-bit DAC to produce an analog ramp that varies corresponding to the contents of the counter. A ripple counter is associated with each respective column. A clock or a source of counts at a predetermined sequence supplies clock signals or counts to the counter elements. Column comparators gate the counter elements when the analog ramp equals the pixel value. The counter contents feed a video output bus to produce the digital video signal. Additional black-level readout counters elements can create and store a black level digital value that is subtracted from the pixel value to reduce fixed pattern noise. The counters may employ two's complement arithmetic. An additional array of buffer counter/latches can be employed. Ripple counters can be configured as counters to capture the digital video level, and then as shift registers to clock out the video levels to an output bus. The clock pulses or counts for the DAC counter and for the ripple counters can be at the same or different rates.
公开/授权文献
- US20090231479A1 Image Sensor ADC and CDS per Column 公开/授权日:2009-09-17