A class A-B CMOS output stage, conceived for low-noise integrated preamplifiers of X- and gamma-ray detector signals, is proposed. It is based on a negative-feedback loop which stabilizes the working current of the output transistor. As a result we obtained both a low output impedance and a large voltage swing. We realized the output stage in a 5V 0.8um CMOS technology. The obtained output voltage swing on a 100 ohm load resistor is -2.5V against a negative power supply of -3V. We inserted the output stage into a charge-sensitive preamplifier for germanium detectors to prove its functionality, obtaining the same large negative voltage swing and a signal rise time as fast as 12.8ns on a terminated 50-ohm cable (equivalent to a load resistor of 100 ohm), as well as a negligible additional noise. The detector capacitance for these measurements was 15pF.
A self-adjusting constant-current source follower for CMOS preamplifiers of semiconductor detector signals / A. Pullia, F. Zocca - In: 2006 IEEE Nuclear Science Symposium Conference Record : Nuclear Science Symposium; Medical Imaging Conference; 15th International Workshop on Room-Temperature Semiconductor X- and Gamma-Ray Detectors; Special Focus Workshops / [a cura di] B. Phlips. - Piscataway : IEEE, 2007. - ISBN 1-4244-0560-2. - pp. 354-356 (( convegno 2006 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room Temperature Semiconductor Detector workshop tenutosi a San Diego, CA, USA nel 2006.
|Titolo:||A self-adjusting constant-current source follower for CMOS preamplifiers of semiconductor detector signals|
PULLIA, ALBERTO (Primo)
ZOCCA, FRANCESCA (Ultimo)
|Parole Chiave:||CMOS technology ; Gamma ray detectors ; Germanium ; Impedance ; Power supplies ; Preamplifiers ; Resistors ; Semiconductor device noise ; Signal detection ; Voltage|
|Settore Scientifico Disciplinare:||Settore ING-INF/01 - Elettronica|
Settore FIS/01 - Fisica Sperimentale
|Data di pubblicazione:||2007|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1109/NSSMIC.2006.356174|
|Tipologia:||Book Part (author)|
|Appare nelle tipologie:||03 - Contributo in volume|