Biasing scheme for AC coupled strip detectors

Author

Jordanov, V.T. ; Macri, J.R. ; Mayer, M.L.

Author_Institution

Amptek Inc., Bedford, MA, USA

fYear

1997

fDate

9-15 Nov 1997

Firstpage

675

Abstract

A new biasing scheme for AC coupled strip detectors has been developed. Application of this scheme reduces the potential nonuniformity due to variations in the strip leakage currents. The circuit comprises an error amplifier that senses the strip current and compensates for the voltage drop across the biasing resistor. The error amplifier is powered by floating power supplies referenced to the bias voltage. A circuit was built that uses a low power amplifier with femtoamp inputs. The circuit regulates the strip potential to within few mV of the bias voltage for strip currents between 0 and 5 nA with a 1.2 GΩ biasing resistor. The circuit has been tested with CZT strip detector

Keywords

amplifiers; detector circuits; leakage currents; nuclear electronics; 0 to 5 nA; 1.2 Gohm; AC coupled strip detectors; CZT strip detector; bias voltage; biasing resistor; biasing scheme; error amplifier; femtoamp inputs; floating power supplies; low power amplifier; nonuniformity; strip currents; strip leakage currents; voltage drop; Anodes; Circuit testing; Detectors; Leakage current; Power amplifiers; Power supplies; Resistors; Strips; Temperature; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium, 1997. IEEE

Conference_Location

Albuquerque, NM

ISSN

1082-3654

Print_ISBN

0-7803-4258-5

Type

conf

DOI

10.1109/NSSMIC.1997.672671

Filename

672671