Noise Spectra of SIU-GaAs Pad Detectors With Guard Rings
Abstract
Description
This paper presents current noise characterization of circular pad Schottky barrier diodes with guard rings. The diodes were fabricated from undopped semi-insulating GaAs, SIU-GaAs, at the University of Glasgow. Current noise spectra were obtained for the detectors for two pad sizes, with reverse bias applied. Three measurements were also made on one of the detectors under forward bias. The noise spectra show an excess noise component, with a low frequency corner at less than 1kHz, and a flat region at higher frequencies. The magnitude of the white noise is approximately half that expected from shot noise theory for the given leakage currents. A fall in the magnitude of the noise was observed at 20kHz which is attributed to the dielectric relaxation time of the material.
9 pages. 9 postscript figures + 1 postscript preprint logo + 1 LaTeX file + 2 non-standard style files. Uses epsfig. Files tarred, gzipped and uuencoded into 1 file. Also available at http://ppewww.ph.gla.ac.uk/preprints/95/06
9 pages. 9 postscript figures + 1 postscript preprint logo + 1 LaTeX file + 2 non-standard style files. Uses epsfig. Files tarred, gzipped and uuencoded into 1 file. Also available at http://ppewww.ph.gla.ac.uk/preprints/95/06