Title :
A 64-channel wide dynamic range charge measurement ASIC for strip and pixel ionization detectors
Author :
Mazza, G. ; Cirio, R. ; Donetti, M. ; La Rosa, A. ; Luparia, A. ; Marchetto, F. ; Peroni, C.
Author_Institution :
INFN sez. di Torino, Italy
Abstract :
In this paper we report a 64-channel ASIC for the readout of parallel plate strip and pixel ionization detectors. The detectors measure the intensity and the geometrical characteristics of a hadron beam for hadrontherapy cancer treatments. The ASIC is based on a current to frequency converter followed by a counter. It uses a charge balancing integration technique to obtain a dynamic range in excess of 105 with a non-linearity of less than 1%. The ASIC has been designed in a CMOS 0.8 μm technology and it has been used for the readout of both strip ionization detectors for beam calibration and pixel detectors for beam monitoring during treatment. A new version of the chip in CMOS 0.35 μm technology which allows bipolar input currents has been designed and is currently under test.
Keywords :
CMOS integrated circuits; application specific integrated circuits; cancer; ionisation chambers; nuclear electronics; particle beam diagnostics; position sensitive particle detectors; radiation therapy; readout electronics; 0.35 mum; 0.8 mum; 64-channel ASIC; CMOS technology; beam calibration; beam monitoring; bipolar input currents; charge balancing integration technique; current-frequency converter; hadron beam geometrical characteristics; hadron beam intensity; hadrontherapy cancer treatments; parallel plate strip ionization detector readout; pixel ionization detector readout; wide dynamic range charge measurement ASIC; Application specific integrated circuits; CMOS technology; Cancer detection; Charge measurement; Counting circuits; Detectors; Dynamic range; Frequency conversion; Ionization; Strips;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2004 IEEE
Print_ISBN :
0-7803-8700-7
Electronic_ISBN :
1082-3654
DOI :
10.1109/NSSMIC.2004.1462367
