Speaker
Mr
Kenji Shimazoe
(Department of Quantum Engineering and Systems Science, University of Tokyo, Japan)
Description
We have designed and fabricated 10 channel/6bit waveform sampling
ASICs using ROHM 0.35 um CMOS technology. This chip was designed for
GSO-APD gamma-ray detector and provides a function of “waveform
recording” at a sampling frequency of 100MHz. This chip has
10channel inputs and each channel has preamp/variable gain
amplifier/6-b folding ADC. The folding ADC greatly reduces the
number of comparators and the power consumption of the chip. This
chip provides a full function of recording a transient behavior of
detector charge signals for each pulse. Self trigger function is
equipped with the system and this will enable simultaneous record of
all input waveforms. Each channel has 64 word FIFO where each
waveform data are stored. Stored data are converted to serial data
and passed to an FPGA where we can implement a detailed signal
processing. This chip is operated at 3.3 V and the power consumption
is 1.2W/chip.
We have developed a data acquisition board using 4 bare chips. This
board has 40 input channels and we plan to use this board for APD-
based DOI-PET detector system which utilizes several different
crystals to recognize depth positions by the difference in their
decay times.
Primary author
Mr
Kenji Shimazoe
(Department of Quantum Engineering and Systems Science, University of Tokyo, Japan)
