Anode front-end electronics for the Cathode Strip Chambers of the CMS Endcap Muon detector

The front-end electronics system for the anode signals of the CMS Endcap Muon Cathode Strip Chambers has been designed. Each electronics channel consists of an input protection network, amplifier, shaper, constant-fraction discriminator, and a programmable delay with an output pulse width shaper. The essential part of the electronics is an ASIC consisting of a 16-channel amplifier-shaper-discriminator (CMP16). The ASIC was optimized for the large cathode chamber size of up to 3.4 x 1.5 m(2) and for the large input capacitance (up to 200 pF). The ASIC combines low power consumption (30 mW/channel) with excellent time resolution (similar to2 ns). The second ASIC provides a programmable time delay which allows the alignment of signals with an accuracy of 2.5 ns. The pre-production samples of the anode front-end boards with CMP16 chips have been successfully tested and the mass production has begun.