Charge integrator and encoder ASIC for readout of the CMS hadron calorimeter photodetectors

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A charge integrator and encoder ASIC is being developed at Fermilab for readout of the CMS hadron calorimeter photodetectors. The chip provides eight nonoverlapping ranges and is pipelined for deadtimeless operation. It is intended to be used with an FADC to digitize hybrid photodiode current pulses at 40 MHz. For each clock period, one range is selected depending on the signal magnitude, and the output of that range is fed to the FADC to form the mantissa. The selected range is encoded and output as a 3-bit digital exponent. Previous versions of this device have been designed for use with ... continued below

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al., A. Baumbaugh et November 1, 1998.

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Description

A charge integrator and encoder ASIC is being developed at Fermilab for readout of the CMS hadron calorimeter photodetectors. The chip provides eight nonoverlapping ranges and is pipelined for deadtimeless operation. It is intended to be used with an FADC to digitize hybrid photodiode current pulses at 40 MHz. For each clock period, one range is selected depending on the signal magnitude, and the output of that range is fed to the FADC to form the mantissa. The selected range is encoded and output as a 3-bit digital exponent. Previous versions of this device have been designed for use with photomultipliers which can have high gain. Hybrid photodiodes have gains of only a few thousand so that a new version of the chip is needed which includes a current-mode preamplifier. The principle of the device is described and early results from a demonstrator project are presented.

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89 Kilobytes

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  • Fourth Workshop on Electronics for LHC Experiments, Rome, Italy, September 21-27, 1998

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  • Other: DE00002098
  • Report No.: FERMILAB-Conf-98/288
  • Grant Number: NONE
  • Office of Scientific & Technical Information Report Number: 2098
  • Archival Resource Key: ark:/67531/metadc673426

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  • November 1, 1998

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  • June 29, 2015, 9:42 p.m.

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  • April 18, 2016, 3:22 p.m.

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al., A. Baumbaugh et. Charge integrator and encoder ASIC for readout of the CMS hadron calorimeter photodetectors, article, November 1, 1998; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc673426/: accessed November 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.