MESFET cryogenic front-end for cross-correlation noise measurements

摘要

We present a dual-channel transimpedance amplifier for cross-correlation noise measurements with a MESFET cryogenic front-end and cooled feedback resistors. In order to test the noise performance of the system, devices with known noise power spectral density (i.e. resistors) have been measured. In particular, such a system has been able to reliably measure a noise current spectral density lower than 1 fA(2)/Hz in a bandwidth larger than 3 kHz.