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Title: A wide dynamic range high linearity in-pixel data acquisition front-end for computed tomography
Authors: Liu, Bing
Yuan, Jie
Keywords: Analogue-digital conversion
CMOS pixel
HSPICE simulations
Computed tomography detectors
Issue Date: 2009
Citation: Proceedings IEEE International Symposium on Circuits and Systems, ISCAS 2009, 24-27 May 2009, Taipei, Taiwan, p. 2301-2304
Abstract: Computed tomography (CT) detectors require wide dynamic range (DR) and high linearity. This paper reports the design of a new CMOS pixel with in-pixel acquisition front-end for CT in a 0.35μm CMOS process. The detector uses a synchronous partial quantization scheme to linearly expand the dynamic range with a constant potential well size. A low-power analog-to-digital converter is also designed in the pixel. HSPICE simulations verify that the designed detector is able to achieve 96dB DR, with -104dB total-harmonic-distortion (THD) over the dynamic range. No calibration procedure is required for the high linearity. The input-referred noise is less than 1mVrms. The frame rate of the designed detector is 2.4k Hz.
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