A 1-Mega Pixels HDR and UV Sensitive Image Sensor With Interleaved 14-bit 64Ms/s SAR ADC

Master thesis (2015)

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Programme
Microelectronics (EEMCS) (TU Delft)
Copyright: © 2015 Zhang, R.
UV sensitive Interleaved SAR ADC Comparator Offset calibration High dynamic range
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Published Date

14-09-2015

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Programme

Microelectronics

Abstract

This thesis presents a 1-Mega pixels high-dynamic range and UV sensitive image sensor in 0.18 µm technology with 14-bit interleaved 64Ms/s SAR ADC. It can achieve 64 fps and 101 dB dynamic range. The pixel array contains three kinds of pixel: UV pixel, visible pixel and low blue pixel. Those three kinds of pixel form a special 4×4 kernel to meet the technology etching requirement and an optimized modulation transfer function (MTF). The extended floating diffusion method is introduced to achieve the high-dynamic range. An odd/even time interleaved analog readout method is used to increase the read out speed. To read out column outputs, the row driver block, column loads, S/H circuits, readout buffers and digital control block are all implemented in this design. A 14-bit interleaved 64Ms/s SAR ADC is used to digitize the analog signals. The ADC block contains 16 14-bit 4Ms/s SAR ADCs. To achieve a 4Ms/s 2V peak-to-peak 14-bit ADC, a high speed comparator with offset calibration is implemented. Two 14-bit serializers are used to serialize the ADC output in this design.