| Summary: | 碩士 === 國立清華大學 === 電子工程研究所 === 107 === Recently, owing to significantly change in eating habits, the number of deaths due to malignant tumors has increased. Among them, female are prone to breast cancer. In order to effectively detect breast cancer and treat it early, mammography is an important tool. It has been proven that mammography can detect breast cancer effectively and reduce the chance of death, therefore mammography is relatively important. The purpose of this thesis is to design and implement the readout circuit of X-ray sensor. This readout circuit is designed base on a novel pixel that was proposed by Dr. Fan Sen-Shyong in National Tsing Hua University. The advantage of the pixel is the small leakage current, and it can be applied to a large area of medical image. The frame rate is 2-frame per second in this read out circuit.
In this paper, the readout circuit design adopts digital correlated double sampling technique to reduce FPN noise, decrease power consumption, and avoid capacitive mismatching and clock skew problems. The digital correlated double sampling circuit includes an amplifier, a comparator, a digital to analog converter, an up/down counter, and a voltage level shifter. The resolution of the proposed readout circuit is 11 bits, and it was implemented using the TSMC 0.35μm 2P4M process. Its die area is 3.385mm × 1.412mm.
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