Initial performance of the two-dimensional 1024-channel amplifier array

This paper describes the initial performance of a two-dimensional analog ASIC that has been developed to read out CdTe pixel detectors for the next-generation hard X-ray imager. The readout chip consists of a 32 × 32 matrix of identical 200 μ m × 200 μ m pixel cells. Each readout cell contains a low noise charge-sensitive amplifier, three-stage pulse shaping amplifiers and a comparator circuit. Pulse processing circuits have been also designed to achieve lower power consumption for the space application. Analog outputs by injecting a test pulse have been obtained from 991 pixels out of 1024 pixels. The mean noise level is 297 ± 29 electrons (rms) and power consumption is 110 μ W / pixel .