Microwave injection experiments were conducted on the analog-to-digital converter of three inverters to study its response to P-band microwaves of different parameters. The effectiveness and reliability of the experiments were achieved by using the eye figure to test the output performance and the temperature measurement circuit to check the operation stability, and analy zing the influence of different chips and printed circuit boards with statistical test. For injected pulse width above 70 ns, the threshold of the injected microwave power for noise margin of 50 ％ of the signal amplitude is 4 to 6 dBm lower than that for sampiing interval change of 10％; the power threshold for 30％ sampling interval change is 2 to 3 dB higher than that for 10％ change; the maximal nonlinear interference is 40％ sampling interval change for the microwave power less than 32 dBm. The threshold almost has no relation to the repetition frequency of the injected microwave. Additionally, for nonlinear interference, it has a strong relation to the pulse width of the injected microwave, with the inflection points of about 40 to70 ns.%利用设计的三反相器模数(A/D)转换电路,开展了P波段微波注入实验.采用眼图观测法对电路的线性响应进行了有效测量,推导了实验线路中微波注入效率公式,利用一种实时温度检测电路来验证芯片工作状态的稳定性,并利用统计检验的方法分析了不同芯片及电路板等对实验数据获取的影响,从而保证了实验的有效性和可信度.重点研究了注入微波的幅值、频率、脉宽及重复频率等参数对反相器正常工作的影响.实验结果表明:当注入微波信号脉宽大于70 ns时,电路信号在微波脉冲结束后,相邻脉冲脉宽变化10%的非线性干扰功率阈值,比使电路信号噪声容限降低50%的功率阈值大4～6 dB,电路信号脉宽变化30%的功率阅值比脉宽变化10%的大2～3 dB,在功率小于32 dBm的实验中得到的最大非线性干扰为脉宽变化约40%.非线性干扰阈值随注入微波信号脉宽变化明显,拐点为40～70 ns.注入微波的重复频率对微波干扰阈值影响很小.
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