Title :
Ultra-low-noise, high-impedance preamp for cryogenic detectors
Author_Institution :
California Institute of Technology, Pasadena, USA
Abstract :
A preamplifier design is presented which is based on a common-drain JFET input. The midband noise performance is En = 0.42 nV/Hz¿, In = 2.8 fA/Hz¿. The circuit has considerably less input capacitance than comparably noisy common-source amplifiers. It is particularly useful for preamplification of 0.1 to 10 MHz signals from liquid-helium-cooled radiation detectors.
Keywords :
high-frequency amplifiers; infrared detectors; preamplifiers; radiofrequency amplifiers; wideband amplifiers; 0.1 to 10 MHz signals; HF operation; IR detectors; RF signals; common-drain JFET input; cryogenic detectors; high-impedance preamp; liquid He cooling; preamplifier design; radiation detector; ultralow noise operation;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19850296
