A versatile fast low noise preamplifier in UHF bipolar technology

A low noise, low power, radiation hard, full-custom-integrated circuit has been studied in UHF1 Harris process for coupling with photodetectors of the CMS electromagnetic calorimeter. A versatile new version of the prototype preamplifier has been designed with improved performances in terms of noise, dynamic range, and consumption. Experimental results using an avalanche photodiode in DC coupling mode to preamplifier are shown. Irradiations tests have been performed with an X-ray generator. Results obtained are given up to 10 Mrad (SiO2). An upgrade version in UHF1X technology at present in foundry is briefly presented.