Märki P, Braem B A, Ihn T
Solid State Physics Laboratory, ETH Zürich, Otto-Stern-Weg 1, 8093 Zürich, Switzerland.
Rev Sci Instrum. 2017 Aug;88(8):085106. doi: 10.1063/1.4997963.
A tabletop low-noise differential amplifier with a bandwidth of 100 kHz is presented. Low voltage drifts of the order of 100 nV/day are reached by thermally stabilizing relevant amplifier components. The input leakage current is below 100 fA. Input-stage errors are reduced by extensive circuitry. Voltage noise, current noise, input capacitance, and input current are extraordinarily low. The input resistance is larger than 1 TΩ. The amplifiers were tested with and deployed for electrical transport measurements of quantum devices at cryogenic temperatures.
本文介绍了一款带宽为100 kHz的桌面式低噪声差分放大器。通过对相关放大器组件进行热稳定处理，实现了低至100 nV/天的电压漂移。输入漏电流低于100 fA。通过大量电路减少了输入级误差。电压噪声、电流噪声、输入电容和输入电流极低。输入电阻大于1 TΩ。这些放大器在低温下对量子器件的电输运测量中进行了测试并得到应用。
