排序方式: 共有8条查询结果,搜索用时 15 毫秒
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光电检测前置放大电路的设计直接影响整个检测电路的性能。选择光电二极管在光伏模式下工作,使用低输入偏置电流和低噪声放大器,设计了光电检测前置放大电路,重点分析了转换电路的稳定性,给出了转换电路元器件参数选择的依据。电路在实际应用中取得了良好的效果。 相似文献
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设计和搭建了一个无线光传输系统。针对系统接收机的稳定性和信噪比要求,详细推导和分析了接收机的光电二极管特性、电路的稳定性和带宽、接收机的噪声和信噪比。详细分析了接收机中噪声的来源,给出了其影响因素及其计算方法,并参考实验器件参数实现了定量计算。在LTspice-IV上对光电二极管前置放大电路进行了建模和仿真,分析了其信号增益和噪声特性,其结果与理论分析接近。对系统进行了1 MHz方波传输实验测试,在接收端能得到较好的方波信号, 能为后续的信号处理模块提供稳定可靠的前级信号。 相似文献
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G.N. Lu P. Pittet G. Sou G. Carrillo A. El Mourabit 《Analog Integrated Circuits and Signal Processing》2003,37(1):57-66
A phase-switching approach suppresses the need to employ a precise multiplier for synchronous demodulation. An improved solution for implementing on-chip synchronous detection consists of using a switched-phase amplifier, which combines pre-amplification and phase-switching operations. This enables circuit simplification, voltage lowering, and power and surface savings. A detector-associated circuit realising pre-amplification and synchronous demodulation is proposed. It includes a transimpedance amplifier, a switched-phase amplifier and a low-pass filter. All these building blocks are designed to operate under a minimum supply of 2 V, using a double-poly, 0.8-m CMOS process. The designed circuit is to be integrated with a CMOS optical detector for portable applications. System-level simulations (including the detector model) are performed to validate the system operation, and to estimate performances. The sensitivity of the system in terms of minimum detectable optical signal (which is synchronously modulated) is evaluated to be 2.2 10–14 W/mm2 in normal measuring conditions. 相似文献
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两足外骨骼机器人足底压力测量系统 总被引:5,自引:0,他引:5
为实现两足外骨骼机器人行走过程中的步态识别,需精确、可靠地获取其足底压力载荷的分布情况。研制一种高灵敏度具有强抗偏载能力的小型轮辐式足底压力传感器,并针对该传感器输出电压只有几十微伏的微弱信号特点设计制作了具有斩波自稳零功能的多路前置信号放大调理电路板。为减小温度等因素产生的非线性误差,设计了传感器恒电流源供电模块。系统采用基于PC的控制器,多通道信号高精度同步采样,通过实际样机试验表明电路实现高增益放大的同时输出噪声峰峰值小于3 mV,且长时间样机试验,信号几乎不存在零漂,具有较好的稳定性。系统结构合理,可靠性高,可适用于仪表信号的处理。 相似文献
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