Semi-custom multi-channel preamplifier integrated circuit for nuclear instrumentation

摘要

A monolithic eight-channel preamplifter for spaceborne nuclear instrumentation is being developed using a semi-custom Application Specific Integrated Circuit (ASIC) based on bipolar tile-array technology, This general purpose charge sensitive preamplifier was designed using a complimentary current mirror approach so that it would be useful for amplifying both positive-going and negative-going input pulses while consuming low to moderate power. The input stages employ a common-collector/common-base topology for good bandwidth and slew characteristics. The output stages employ power devices configured as class AB and are capable of driving 50-ohm loads. Each of the eight channels can be biased or enabled separately. The design is implemented with dielectrically isolated, vertical geometry transistors. Such devices are inherently radiation-hard and have PNP transistors whose performance is superior to the lateral geometry types. This paper describes a unique aspect of the design and computer simulation results of the ASIC.