A 16-channel programmable antialiasing amplifier

We designed and built a 16-channel NIM module acting as preliminary analog processing of the signals to be converted by sampling ADCs for the CHIMERA 4π multidetector digital pulse shape acquisition system. The main functions of the module are: i) a second order anti-aliasing filter with two programmable cutting frequencies, ii) a programmablegain amplifier to cope with the full dynamic range of the ADC, iii) a programmable output offset voltage with AC or DC input coupling selection. In addition, a buffered replica of input signals is present on the front panel to serve the conventional analog acquisition chain. All the module parameters are programmable through an RS485 serial interface.