一、TIAs的传统概念和新的挑战早在1914年,Hunt将颈动脉疾患引起的局灶性短暂性神经功能障碍称为“大脑性间歇性跛行”(Cerebral intermittent claudication)。40年后Denny-Brown氏描述为血液动力学危象或“短暂发作性威利氏环供血不足...一、TIAs的传统概念和新的挑战早在1914年,Hunt将颈动脉疾患引起的局灶性短暂性神经功能障碍称为“大脑性间歇性跛行”(Cerebral intermittent claudication)。40年后Denny-Brown氏描述为血液动力学危象或“短暂发作性威利氏环供血不足”(Episodic insufficieny in the circle of Willis of a temporary nature)。晚近,Millikan等对短暂性脑缺血发作(TIAs)的概念详尽阐述并加以提炼,强调短暂性神经缺陷必须在24小时内完全消失,发作间歇期无阳性体征,CT和核素脑扫描未见异常。这一概念多年来被临床神经病学者普遍接受并采用。一般认为,TIAs指某一脑动脉分布区短暂性血流阻断而引起相应区域内暂时性神经障碍24小时内完全恢复,无相应的病理学改变,为脑梗塞的前兆。展开更多
For time-of-flight(TOF)light detection and ranging(LiDAR),a three-channel high-performance transimpedance amplifier(TIA)with high immunity to input load capacitance is presented.A regulated cascade(RGC)as the input st...For time-of-flight(TOF)light detection and ranging(LiDAR),a three-channel high-performance transimpedance amplifier(TIA)with high immunity to input load capacitance is presented.A regulated cascade(RGC)as the input stage is at the core of the complementary metal oxide semiconductor(CMOS)circuit chip,giving it more immunity to input photodiode detectors.A simple smart output interface acting as a feedback structure,which is rarely found in other designs,reduces the chip size and power consumption simultaneously.The circuit is designed using a 0.5μm CMOS process technology to achieve low cost.The device delivers a 33.87 dB?transimpedance gain at 350 MHz.With a higher input load capacitance,it shows a-3 dB bandwidth of 461 MHz,indicating a better detector tolerance at the front end of the system.Under a 3.3 V supply voltage,the device consumes 5.2 mW,and the total chip area with three channels is 402.8×597.0μm2(including the test pads).展开更多
文摘一、TIAs的传统概念和新的挑战早在1914年,Hunt将颈动脉疾患引起的局灶性短暂性神经功能障碍称为“大脑性间歇性跛行”(Cerebral intermittent claudication)。40年后Denny-Brown氏描述为血液动力学危象或“短暂发作性威利氏环供血不足”(Episodic insufficieny in the circle of Willis of a temporary nature)。晚近,Millikan等对短暂性脑缺血发作(TIAs)的概念详尽阐述并加以提炼,强调短暂性神经缺陷必须在24小时内完全消失,发作间歇期无阳性体征,CT和核素脑扫描未见异常。这一概念多年来被临床神经病学者普遍接受并采用。一般认为,TIAs指某一脑动脉分布区短暂性血流阻断而引起相应区域内暂时性神经障碍24小时内完全恢复,无相应的病理学改变,为脑梗塞的前兆。
文摘For time-of-flight(TOF)light detection and ranging(LiDAR),a three-channel high-performance transimpedance amplifier(TIA)with high immunity to input load capacitance is presented.A regulated cascade(RGC)as the input stage is at the core of the complementary metal oxide semiconductor(CMOS)circuit chip,giving it more immunity to input photodiode detectors.A simple smart output interface acting as a feedback structure,which is rarely found in other designs,reduces the chip size and power consumption simultaneously.The circuit is designed using a 0.5μm CMOS process technology to achieve low cost.The device delivers a 33.87 dB?transimpedance gain at 350 MHz.With a higher input load capacitance,it shows a-3 dB bandwidth of 461 MHz,indicating a better detector tolerance at the front end of the system.Under a 3.3 V supply voltage,the device consumes 5.2 mW,and the total chip area with three channels is 402.8×597.0μm2(including the test pads).
