A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is
Low‐noise preamplifier with input and feedback transformers for low source resistance sensors
Review of Scientific Instruments
We describe the design, schematics, and performances of a very-low-noise, low-frequency preamplifier. It operates in the 5 Hz-100 kHz range and offers an input equivalent voltage noise density as low as 65 pV/ ,/I%; the current noise increases with frequency and settles to about 1.5 pA/ @ at 100 kHz. The amplifier uses input and feedback signal transformers and operates in full differential mode; a -163 dB common-mode rejection ratio is achieved at line frequency. Design methodology is applicable to other ranges of frequencies.doi:10.1063/1.1143171 fatcat:zyvlx2actbguhjrlyl6rjhdagu