Title :
Biasing scheme for AC coupled strip detectors
Author :
Jordanov, V.T. ; Macri, J.R. ; Mayer, M.L.
Author_Institution :
Amptek Inc., Bedford, MA, USA
fDate :
6/1/1998 12:00:00 AM
Abstract :
A new biasing scheme for AC coupled strip detectors has been developed. Application of this scheme reduces the potential non-uniformity 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 a CZT strip detector
Keywords :
detector circuits; leakage currents; nuclear electronics; 0 to 5 nA; 1.2 Gohm; AC coupled strip detectors; CZT strip detector; biasing resistor; biasing scheme; error amplifier; femtoamp inputs; floating power supplies; strip current; strip leakage currents; strip potential; voltage drop compensation; Anodes; Circuit testing; Detectors; Leakage current; Power amplifiers; Power supplies; Resistors; Strips; Temperature; Voltage;
Journal_Title :
Nuclear Science, IEEE Transactions on
