Design of a low noise, low power consumption CMOS preamplifier shaper for readout of microstrip detectors in the DMILL radiation hardened process and irradiation measurements

One of the proposed schemes of microstrip detector readout in the future LHC collider experiments is the use of a slow preamplifier with subsequent analog pulse shape processing (deconvolution) to recover initial time information. Following this idea a CMOS preamplifier shaper (CR-RC active filter) with 75 ns shaping time has been designed using a radiation hardened process DMILL. The tests of a prototype chip show a noise performance of ENC = 330 e(-) + 51 e(-)/pF for a peaking time of 100 ns, gain of 30 mV/MIP and a power consumption of 1.1 mW per channel. Measurements after irradiation by gamma photons, electrons and neutrons are also presented in this paper.