The design and realization of an ultra-low-noise, high-input-impedance amplifier for low-frequency noise measurements in electronic devices is presented. Special care is devoted to the solution of typical problems encountered in the design of low-noise low-frequency equipment, such as power supply noise and temperature fluctuations. The ultra-low-noise preamplifier has a bandwidth of over seven decades with a low-frequency roll-off of 4 mHz. The noise characteristics obtained are sensibly better than those of commercial preamplifiers commonly adopted in low-frequency noise measurements. The application of this preamplifier to the realization of standard 1/f/sup gamma / noise generators is presented.
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机译:提出了一种用于电子设备中低频噪声测量的超低噪声,高输入阻抗放大器的设计和实现。要特别注意解决低噪声低频设备设计中遇到的典型问题,例如电源噪声和温度波动。超低噪声前置放大器具有超过七十年的带宽,低频衰减为4 mHz。所获得的噪声特性明显好于低频噪声测量中通常采用的商用前置放大器。介绍了该前置放大器在实现标准1 / f / sup伽玛/噪声发生器中的应用。
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