CAJ | 학술논문

　　模数混合信号电路已成为未来电路设计的发展趋势，对模数混合电路诊断和测试方面的需求日益急迫。文章首先针对模拟/数字混合电路的故障诊断，基于小波分析理论，提出了动态电流（IDDT）测试方法。其次应用小波变换的时频分析特性，对模拟/数字混合电路正常模式和故障模式的 IDDT 采样信号进行小波分解，得到特征小波系数，计算出正常模式和故障模式下相应特征小波系数的均方根误差。最后将待检测电路的特征小波系数均方根误差与已知正常及故障模式的特征小波系数均方根误差进行比较，根据结果的异同实现模拟/数字混合电路的故障诊断。通过仿真实验验证了该测试方法的有效性，与传统单一时、频域（FFT）诊断分析方法相比，仿真结果显示，该方法对模拟/数字混合电路的故障有较高的检测灵敏度，可以实现绝大多数故障的准确定位，为模拟/数字混合电路故障的准确诊断提供了一种有效手段。
　　모수혼합신호전로이성위미래전로설계적발전추세，대모수혼합전로진단화측시방면적수구일익급박。문장수선침대모의/수자혼합전로적고장진단，기우소파분석이론，제출료동태전류（IDDT）측시방법。기차응용소파변환적시빈분석특성，대모의/수자혼합전로정상모식화고장모식적 IDDT 채양신호진행소파분해，득도특정소파계수，계산출정상모식화고장모식하상응특정소파계수적균방근오차。최후장대검측전로적특정소파계수균방근오차여이지정상급고장모식적특정소파계수균방근오차진행비교，근거결과적이동실현모의/수자혼합전로적고장진단。통과방진실험험증료해측시방법적유효성，여전통단일시、빈역（FFT）진단분석방법상비，방진결과현시，해방법대모의/수자혼합전로적고장유교고적검측령민도，가이실현절대다수고장적준학정위，위모의/수자혼합전로고장적준학진단제공료일충유효수단。
As the analog/digital hybrid circuit is becoming one of the trends of the future circuit design,the demand for the troubleshooting and testing of the analog /digital hybrid circuit becomes increasingly urgent.This paper proposes a transient current(IDDT)testing method for the fault diagnosis of analog/digital hybrid circuit. Based on the time-frequency resolution property of wavelet transformation,wavelet decomposition is applied to the sampled signals of dynamic current in the normal mode and the fault mode of the analog/digital hybrid circuit so as to get the wavelet coefficient and calculate the coefficient′s root-mean-square error(RMSE)in the two modes. By comparing the RMSE of the tested IDDT with that in the known normal and fault modes,the fault of the ana-log/digital hybrid circuit can be diagnosed.The simulation result on a 2-bit flash ADC circuit demonstrates the proposed method is valid and has a higher sensitivity in fault detection than the traditional methods.The simulation result also implies the method is able to effectively localize the fault regions in analog/digital hybrid circuit.