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Computed tomography (CT) requires high-speed detector with wide dynamic range (WDR) and high linearity. CMOS CT detectors have been demonstrated with WDR and quantum-limited noise. However, existing CMOS CT detectors have low linearity, which cause artifacts during the image reconstruction. They also require high-resolution off-chip analog-to-digital converter (ADC) to quantize the WDR. In this work,...
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 0.35 mum 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...
Imaging sensors are being used as data acquisition systems in new biomedical applications. These applications require wide dynamic range (WDR), high linearity and high signal-to-noise ratio (SNR), which cannot be met simultaneously by existing CMOS imaging sensors. This paper introduces a new activity-triggered WDR CMOS imaging sensor with very low distortion. The new WDR pixel includes self-resetting...
A low-distortion and wide dynamic range (DR) CMOS imager for wireless capsule endoscopy is designed in a 0.35um CMOS process. The new pixel circuit can expand the DR, and improve the signal-to-noise ratio (SNR) at the same time, with a partial pixel-level digitization scheme. The new pixel is also designed to enable digital self-calibration to compensate for the analog non-idealities in the pixel...
A current-mode temporal difference imager for wireless capsule-endoscopy is introduced. The new imager generates low output data rate. Wide dynamic range image can be recovered from the low-rate data at the receiver side. To reduce the circuit charge injection error of the difference imager, a calibration technique for the pixel is developed, and introduced in the paper. The image restoration error...
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