Cryogenic Differential Amplifier for NMR Applications
Cryogenic Differential Amplifier for NMR Applications
We have designed and characterized a cryogenic amplifier for use in $$^3$$ He NMR spectrometry. The amplifier, with a power consumption of $$\sim 2.5$$ mW, works at temperatures down to 4 K. It has a high-impedance input for measuring a signal from NMR resonant circuit, and a 50 $${\Omega }$$ …