精密整流电路广泛应用于交流信号测量和模拟信号处理系统,是微弱信号采样和测量电路的重要组成部分。阐述了通用精密整流电路整流特性,详细分析信号过零时因整流二极管截止而产生的误差,提出基于第二代电流传输器(CCⅡ)的高频弱信号精密整流电路,采用电流运算放大器AD844实现CCⅡ模型使电路工作在电流模式。仿真分析结果表明,该电路能够精确整流最小幅值10 m V,上限截止频率高达10 MHz的输入信号,有效避免了常用电压模式整流电路对频率的限制及信号过零附近的失真,提高了弱信号整流精度。
在无人机和地面站通信交互的过程中,由于各方面因素,例如频率不同步、传输延时等,可能会造成无人机采集到的数据在传输期间发生错误,导致地面站接收到的数据有部分丢失。文章提出一种梯度下降优化算法--梯度下降自适应学习率算法(RMSProp with NAG,RMSPN),对缺失数据集进行曲线拟合,得到丢失数据的近似值,对缺失数据集进行填补。实验结果证明了该方法曲线拟合效果良好,估计值与实际值误差较小,算法可行性高。
This paper proposes a latch that can mitigate SEUs via an error detection circuit.The error detection circuit is hardened by a C-element and a stacked PMOS.In the hold state,a particle strikes the latch or the error detection circuit may cause a fault logic state of the circuit.The error detection circuit can detect the upset node in the latch and the fault output will be corrected.The upset node in the error detection circuit can be corrected by the C-element.The power dissipation and propagation delay of the proposed latch are analyzed by HSPICE simulations.The proposed latch consumes about 77.5%less energy and 33.1%less propagation delay than the triple modular redundancy(TMR)latch.Simulation results demonstrate that the proposed latch can mitigate SEU effectively.
