共查询到19条相似文献,搜索用时 62 毫秒
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为了将CAN(Controller Area Network)总线上的-12~12 V的信号转化为0~5 V的串行数字信号,设计了一种应用于CAN收发器的宽输入范围的迟滞比较器。实现的方案是先使用电阻将电源和总线上的信号线性叠加得到5 V电压内的信号,再使用全差分放大器进行钳位,使用共模反馈稳定共模工作点,最后使用对尾电流进行温度补偿的内部正反馈的迟滞比较器比较得到数字信号。基于VIS 0.4μm BCD工艺,使用Hspice进行了仿真验证。仿真结果表明:电路能够将-12~12 V的电压比较得到正确的数字信号。在常温即25℃,TT工艺角下,迟滞门限为108.9 mV。在温度从-40℃~125℃变化时,迟滞门限电压变化小于9.16 mV,温度系数为0.055 5 mV/℃。 相似文献
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基于分段温度补偿带隙实现的低温漂LDO电路 总被引:1,自引:0,他引:1
设计一种基于分段温度补偿带隙实现的低温漂LDO电路.将整个温度范围,分成四段,在不同的温度范围下,改变带隙的正温度系数,从而完成对带隙电压的分段补偿,由此得到温度系数很小的带隙基准源,用此带隙基准源作为LDO的参考电压,来实现低温漂的LDO.电路使用0.8um的BCD工艺库模型进行仿真,仿真结果表明,使用分段补偿带隙使LDO的温度系数得到了极大的降低,温度系数从原先未补偿的43.6ppm/℃变为2.4ppm/℃. 相似文献
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一种宽动态范围高速数据采集系统的设计 总被引:2,自引:0,他引:2
船用动调陀螺仪捷联惯性系统中,需要对陀螺仪力反馈回路中的宽动态范围电流信号进行精确、实时测量。本详细介绍了一种采用串行ADC线路的大动态范围高速数据采集系统,其动态范围优于138dB,采样频率可达75kS/s,较好地解决了动调陀螺仪的信号采集问题。 相似文献
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华敏 《电子制作.电脑维护与应用》1995,(8):30-31
在电子线路中,特别是有运算放大器的电路,往往需要正负电源供电,采用具有正负电压输出的跟踪式稳压器是十分方便的。近年来,微型计算机发展极快,特别是单片机的应用更为普及。以单片机为核心配上各种外围电路组成的测量仪器、仪表、家用电器、医疗仪器日益增多。它们性能良好、功能齐全,但对电源要求较高,并要求多种电压供电。例如,单片机 5V供电,LCD背光调整为可调负压,外围电路可能要求±5V或±12V等。这些以单片机为核心的电子产品中还有不少是便携式的,但 相似文献
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In this paper, we describe an analog very large-scale integration (VLSI) implementation of a wide range Euclidean distance computation circuit - the key element of many synapse circuits. This circuit is essentially a wide-range absolute value circuit that is designed to be as small as possible (80 /spl times/ 76 /spl mu/m) in order to achieve maximum synapse density while maintaining a wide range of operation (0.5 to 4.5 V) and low power consumption (less than 200 /spl mu/W). The circuit has been fabricated in 1.5-/spl mu/m technology through MOSIS. We present simulated and experimental results of the circuit, and compare these results. Ultimately, this circuit is intended for use as part of a high-density hardware implementation of a self-organizing map (SOM). We describe how this circuit can be used as part of the SOM and how the SOM is going to be used as part of a larger bio-inspired vision system based on the octopus visual system. 相似文献
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一种两级误差放大器结构的LDO设计 总被引:1,自引:0,他引:1
基于SMIC 0.18μm CMOS工艺,设计了一种两级误差放大器结构的LDO稳压器。该电路运用两级误差放大器串联方式来改善LDO的瞬态响应性能,采用米勒频率补偿方式提高其稳定性。两级放大器中主放大器运用标准的折叠式共源共栅放大器,决定了电路的主要性能参数;第二级使用带有AB类输出的快速放大器,用来监控LDO输出电压的变化,以快速地响应此变化。电路仿真结果显示:在电源电压为5 V时,输出为1.8 V,输出电压的温度系数为10×10-6/℃;当电源电压从4.5 V到5.5 V变化时,线性瞬态跳变为48 mV;当负载电流从0 mA到60 mA变化时,负载瞬态跳变为5 mV。且环路的相位裕度为74°,整个电路的静态电流为37μA。该电路结构的瞬态跳变电压值远小于其他电路结构,且能实现低功耗供电。 相似文献
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Dongbing Gu Huosheng Hu 《Robotics, IEEE Transactions on》2005,21(5):1022-1028
This paper presents a receding horizon (RH) controller used for regulating a nonholonomic mobile robot. The RH control stability is guaranteed by adding a terminal-state penalty to the cost function and a terminal-state region to optimization constraints. A suboptimal solution to the optimization problem is sufficient to achieve stability. A new terminal-state penalty and its corresponding terminal-state constraints are found. Implementation and simulation results are provided to verify the proposed control strategy. 相似文献
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This paper proposes a new variable-mode control strategy that is applicable for LLC resonant converters operating in a wide input voltage range. This control strategy incorporates advantages from full-bridge LLC resonant converters, half-bridge LLC resonant converters, variable-frequency control mode, and phase-shift control mode. Under this control strategy, different input voltages determine the different operating modes of the circuit. When the input voltage is very low, it works in a full-bridge circuit and variable frequency mode (FB_VF mode). When the input voltage rises to a certain level, it shifts to a full-bridge circuit and phase-shifting control mode (FB_PS mode). When the input voltage further increases, it shifts into a half-bridge circuit and variable frequency mode (HB_VF mode). Such shifts are enabled by the digital signal processor (DSP), which means that no auxiliary circuit is needed, just a modification of the software. From light load to heavy load, the primary MOSFET for the LLC resonant converter can realize zero-voltage switching (ZVS), and the secondary rectifier diode can realize zero-current switching (ZCS). With an LLC resonant converter prototype with a 300 W rated power and a 450 V output voltage, as well as a resonant converter with 20–120 V input voltage, the experiments verified the proposed control strategy. Experimental results showed that under this control strategy, the maximum converter efficiency reaches 95.7% and the range of the input voltage expands threefold. 相似文献
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针对数字式绝缘电阻测试仪的直流高压可控开关稳压电源和量程的自动切换电路,采用ARM 7结构的LPC2136芯片作为控制核心,在直流高压电源电路的反馈回路中控制直流高压输出值,在高压采集回路中实现量程切换。文中对直流高压电源的前向通道和反馈通道、高压采集回路中的量程切换电路的电路结构和基本原理进行了详细的阐述。设计将高压输出电压值的控制与量程切换控制在不同的电路中实现,提高了电路的可靠性,经测试达到了好的效果并得到应用。 相似文献