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论述了一种测试混合信号集成电路衬底噪声波形的方法采用电压比较器利用衬底电压对比较器状态的影响对噪声作出统计测试根据测试结果重建噪声波形设计了一测试系统的原理框图推导出了用于衬底噪声波形重建的表征取样噪声电压的平均电压和表征测试误差的均方根值的计算公式建立了模拟实验电路给出了SPICE模拟实验结果
A method for testing the noise floor of mixed signal IC substrate is proposed. The voltage comparator is used to make a statistical test on the influence of the substrate voltage on the state of the comparator. The noise waveform is reconstructed based on the test result. The average voltage of the sampling noise voltage and the formula for calculating the rms value of the test error were built for modeling the noise floor of the substrate. The simulation experiment circuit was established and the SPICE simulation results