提出一种由分立元件搭建的新型集成运放低频噪声测量系统.首先建立了运算放大器的噪声模型；然后对测试系统的各个模块电路进行设计和仿真；最后通过数据采集卡及频谱分析仪对被测集成运放的低频噪声数据进行频域分析.实验结果表明，该方法能够实现集成运放低频噪声100~105 Hz频域内功率谱密度数据的测量和采集，此数据与厂家提供的数据手册中的典型输入等效噪声值基本吻合，测量相对误差为0.039.
This paper presents a new type of integrated operational amplifier low-frequency noise measurement system built by discrete components. First, the noise model of the operational amplifier is established. Then sub-circuit modules of the test system are designed and simulated separately. Finally, the low-frequency noise measurement and data acquisition of the integrated operational amplifier are performed. The experimental results show that this system can realize the measurement of low frequency noise and power spectral density of integrated operational amplifiers in the frequency range of 100~105 kHz. The measured input equivalent noise value is basically consistent with that presented in the product data-sheet, with the measurement error is 0.039.
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