基于容错测试的高鲁棒性模拟电路演化设计

Evolutionary Design of High Robust Analog Circuit Based on Fault-tolerance Test

为提高电磁环境下电路的抗干扰特性,基于电路进化设计思想,采用基因编程算法自动实现鲁棒性模拟电路的进化设计,使电路在局部元件受扰情况下仍然能够保持原有功能,并且电路的整体性能衰减较小。同时定义了电路局部短路和局部断路两种故障模式,通过调节电路中每个元件并联电阻的阻值来模拟电路故障状况及其损伤程度,采用基于动态抽样的近似鲁棒性评估技术实现低通滤波器的进化设计;最后分别对标准进化电路和鲁棒电路在不同状况下电路的输出响应进行测试。实验结果表明:通过引入假设故障模型和鲁棒性评价模型,在电路进化适应度评估过程中增加电路鲁棒性评价能够进化出固有鲁棒的电路;在局部短路故障情况下,在频率响应曲线中,鲁棒电路基本保持原始弯曲状态,频域响应曲线仅有6.27%的衰减率;局部断路故障情况下,鲁棒电路能够很好的保持原始输出响应,频域响应曲线仅有3.4%的衰减。

In order to improve the anti-interference performance of circuit in electromagnetic environment, on the basis of idea of circuit evolution design, we focus on how to achieve robust evolutionary analog circuits design automatically by adopting genetic programming, which ensures the circuit to possess the capable of maintaining the original features and the least reducing performance under the condition that partial components are interfered. We define two fault modes including partial short and partial disconnection. The degree of fault and the situation of fault can be adjusted by increasing or decreasing the resistance which is added in series or in parallel with any component in the circuit. The evolution design of the low pass filter can be finished by using the similar robustness assessment technology based on dynamic sampling. Finally, the output response of the standard evolution circuit and the robustness circuit can be respectively tested under the different situations. Test results show that inherent robust circuit can be evolved through evolvable hardware（EHW） by introducing the fault model and the robust evaluation model and increasing the robustness assessment in the process of the adaptive evaluation of circuit. Under local short-circuit fault, robust circuit remains the original bending state in the frequency response curve, frequency response curve only has 6.27% of the decay rate; Under local open circuit fault, robust circuit can well maintain the original output response, frequency response curve only has 3.4% of attenuation.