RESUMO
An automotive 2.1 µm CMOS image sensor has been developed with a full-depth deep trench isolation and an advanced readout circuit technology. To achieve a high dynamic range, we employ a sub-pixel structure featuring a high conversion gain of a large photodiode and a lateral overflow of a small photodiode connected to an in-pixel storage capacitor. With the sensitivity ratio of 10, the expanded dynamic range could reach 120 dB at 85 °C by realizing a low random noise of 0.83 e- and a high overflow capacity of 210 ke-. An over 25 dB signal-to-noise ratio is achieved during HDR image synthesis by increasing the full-well capacity of the small photodiode up to 10,000 e- and suppressing the floating diffusion leakage current at 105 °C.
RESUMO
We propose a dual-channel interface architecture that allocates high and low transition-density bit streams to two separate channels. The transmitter utilizes the stacked drivers with charge-recycling to reduce the power consumption. The direct current (DC)-coupled receiver front-end circuits manage the common-mode level variations and compensate for the channel loss. The tracked oversampling clock and data recovery (CDR), which realizes fast lock acquisition below 1 baud period and low logic latency, is shared by the two channels. Fabricated in a 65-nm low-power complementary metal-oxide semiconductor (CMOS) technology, the dual-channel transceiver achieves 12-Gb/s data rate while the transmitter consumes 20.43 mW from a 1.2-V power supply.
RESUMO
BACKGROUND: This study assessed the neurologic and cosmetic outcome of the endoscopic radial artery harvesting (ERH) technique in coronary artery bypass grafting (CABG). METHODS AND RESULTS: The study group comprised 257 consecutive patients who underwent CABG between January 2001 and August 2005 at Kyungpook National University Hospital. The first 157 patients (open group) underwent conventional open harvesting of the radial artery and the second 100 (endoscopic group) had endoscopic harvesting. The severity of both the motor and sensory symptoms, as well as the cosmetic results, was evaluated immediately and at least 6 months after surgery. In the open group, 29 patients experienced neuralgia along the distribution of the lateral antebrachial cutaneous nerve, but none in the endoscopic group patients experienced any sensory abnormalities (p<0.05). However, neuralgia along the distribution of the superficial radial nerve was similarly observed in both groups. No one in either group complained of any motor symptoms. The patients in the endoscopic group were also satisfied with the cosmetic results. CONCLUSIONS: ERH resulted in less neurologic complications of the hand and forearm, and outstanding aesthetics. ERH may be the procedure of choice for radial artery harvesting.
