A 64-channel integrated circuit for signal readout from coordinate detectors

Abstract

A: A specialized integrated circuit was developed for the readout of signal from coordinate detectors of different types, including gas micro-pattern detectors and silicon microstrip detectors. The ASIC includes 64 channels, each containing a low-noise charge-sensitive amplifier with a connectable feedback capacitor and resistor, and fast reset of the feedback capacitor. Each channel of the ASIC also contains 100 cells of analogue memory where the signal can be stored at a rate of 10 MHz. The pitch of input pads is 50 µm and the chip size is 5 × 5 mm 2 . The equivalent noise charge of the ASIC channel is about 2000 electrons with 10 pF capacitance at the input and maximal signal before saturation corresponds to 2 × 10 6 electrons. The first application for this ASIC is the detector for imaging of explosions at a synchrotron radiation beam (DIMEX), where it has to substitute the old and slower APC128 ASIC. The full-size electronics including 8 ASICs for 512 channels was assembled and tested.

The GEM-based detector for tracking the Compton-scattered photons in the Laser Polarimeter facility at VEPP4-M collider

“…Figure 8 shows the chip design from the engineering CAD software and the schematic of one channel. The electronic calibration of the FE board channel was made and results complied to the previous study of the DMXG64 ASIC [8] (figure 9).…”

“…The DMXG64 ASIC [8] was developed in Budker Institute of Nuclear Physics for various GEMbased detectors. It has 64 input channels, while each channel has low-noise charge sensitive amplifier and dedicated analog memory for 100 samples.…”

Operation of silicon microstrip detector with integrating readout for fast time-resolved experiments

“…As the next step we plan to develop new front-end board, adapted to the pitch of 50 µm unlike the present electronics. The new electronics will use an ASIC, that will be specially designed for this application, and will be based on modified version of DMXG64B integrated circuit [14]. In order to increase quantum efficiency we are going to try a sensor based on GaAs.…”

The high-resolution particle tracking triple-GEM detector for the Test Beam facility at VEPP-4M collider

“…This pipeline shift register can be operated with a frequency of 10 MHz. Due to limited amount of APC128 chips and expecting better parameters from alternatives, future designs will be based on DMXG64 ASIC which was developed at the BINP [10].…”