AFEII Analog Front End Board Design Specifications

Rubinov, Paul

Fermi National Accelerator Laboratory

关键词: Discriminators;    Saturation;    Amplitudes;    Fibers;    Luminosity;   

DOI  :  10.2172/1012682
RP-ID  :  FERMILAB-TM-2488-PPD
RP-ID  :  AC02-07CH11359
RP-ID  :  1012682

美国|英语

来源: UNT Digital Library

【 摘 要 】

This document describes the design of the 2nd iteration of the Analog Front End Board (AFEII), which has the function of receiving charge signals from the Central Fiber Tracker (CFT) and providing digital hit pattern and charge amplitude information from those charge signals. This second iteration is intended to address limitations of the current AFE (referred to as AFEI in this document). These limitations become increasingly deleterious to the performance of the Central Fiber Tracker as instantaneous luminosity increases. The limitations are inherent in the design of the key front end chips on the AFEI board (the SVXIIe and the SIFT) and the architecture of the board itself. The key limitations of the AFEI are: (1) SVX saturation; (2) Discriminator to analog readout cross talk; (3) Tick to tick pedestal variation; and (4) Channel to channel pedestal variation. The new version of the AFE board, AFEII, addresses these limitations by use of a new chip, the TriP-t and by architectural changes, while retaining the well understood and desirable features of the AFEI board.