학술논문
Monolithic cryogenic preamplifiers based on large gate-area GaAs MESFETs
Document Type
Conference
Author
Source
Proceedings of 1994 IEEE Nuclear Science Symposium - NSS'94 Nuclear science and medical imaging Nuclear Science Symposium and Medical Imaging Conference, 1994., 1994 IEEE Conference Record. 1:266-269 vol.1 1994
Subject
Language
Abstract
Monolithic preamplifiers using large gate-area Gallium-Arsenide Metal-Semiconductor Field-Effect Transistors (GaAs MESFETs) at the input have been designed and fabricated using an ion-implanted GaAs process. Large gate-area is necessary to obtain low series noise. A voltage-sensitive preamplifier with differential input, designed to operate at 4 K to readout the signal of bolometric detectors, was fabricated. Two current-sensitive preamplifiers with an input transistor of 24000 /spl mu/m in gate width, designed for the readout of noble liquid calorimeters, have been integrated in a single chip. Recent tests with a LAr calorimeter prototype demonstrated strong noise reduction compared to previous state-of-the-art hybrid readout circuits. Radiation damage test have been performed at cold temperatures on the current-sensitive preamplifier chips.ETX