Title :
A Low-Noise Broadband Cryogenic Preamplifier Operated in a High-Field Superconducting Magnet
Author :
Mathur, Raman ; Knepper, Ronald W. ; O´Connor, Peter B.
Author_Institution :
Dept. of Electr. & Comput. Eng., Boston Univ., Boston, MA
Abstract :
The recently developed cryogenic Fourier-transform ion cyclotron resonance mass spectrometer (FTICRMS) has provided an opportunity for improvement in the limit of detection of FTICRMS by cooling the detection preamplifier to 4 K, thus reducing the thermal noise in the preamplifier. In this manuscript, we describe the development of a low-noise cryogenic preamplifier for FTICRMS and its performance in a high-field superconducting electromagnet. The preamplifier has a voltage gain of 250 with - 3-dB roll off at 850 kHz. The cryogenic preamplifier circuit has shown about 20 times improvement in signal-to-noise ratio, over the room temperature version.
Keywords :
cryogenic electronics; low noise amplifiers; mass spectroscopy; preamplifiers; superconducting magnets; wideband amplifiers; Fourier-transform ion cyclotron resonance mass spectrometer; broadband cryogenic preamplifier; frequency 850 kHz; high-field superconducting magnet; low-noise preamplifier; signal-noise ratio; Cryogenic amplifier; Fourier-transform ion cyclotron resonance mass spectrometer (FTICRMS); low-noise amplifier;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2008.2007272