SMQIE: Challenges associated with a low frequency charge integrator and encoder for the CDF II Calorimeter

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Description

The SMQIE is the newest member of the QIE family of integrated circuits. It has been developed specifically for the Shower Max Detector upgrade of the CDF Plug and Central Calorimeters at Fermilab. Like its predecessors, it converts charges over a wide dynamic range with a variable resolution. Unlike its predecessors it contains its own Flash, trigger delay pipeline and buffer area. Furthermore, it operates both at a lower frequency and with only a simple 5-volt power supply. The simultaneous requirements of low frequency and reduced voltage force the front end into a low current, high impedance regime. Specialized circuitry ... continued below

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154 Kilobytes pages

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J. Hoff, G. Drake, A. Byon-Wagner, G. Foster and M. Lindgren November 18, 1999.

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Description

The SMQIE is the newest member of the QIE family of integrated circuits. It has been developed specifically for the Shower Max Detector upgrade of the CDF Plug and Central Calorimeters at Fermilab. Like its predecessors, it converts charges over a wide dynamic range with a variable resolution. Unlike its predecessors it contains its own Flash, trigger delay pipeline and buffer area. Furthermore, it operates both at a lower frequency and with only a simple 5-volt power supply. The simultaneous requirements of low frequency and reduced voltage force the front end into a low current, high impedance regime. Specialized circuitry is necessary to prevent charge slopped-over into subsequent time slices. The considerable amount of digital circuitry monolithic with the analog front end makes for a noisy substrate. Specialized circuitry and layout techniques are necessary to keep this chip from being noise-limited. The final design is a two-channel single-ended Charge Integrator and Encoder (QIE) that operates at a frequency of 7.6MHz with a least significant bit resolution of 15 fC in its lowest range.

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154 Kilobytes pages

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  • VIII International Conference on Calorimetry in High Energy Physics, Lisbon (PT), 06/13/1999--06/19/1999

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  • Report No.: FERMILAB-Conf-99/316
  • Grant Number: AC02-76CH03000
  • Office of Scientific & Technical Information Report Number: 14777
  • Archival Resource Key: ark:/67531/metadc619204

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  • November 18, 1999

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  • June 16, 2015, 7:43 a.m.

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  • April 1, 2016, 4:58 p.m.

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J. Hoff, G. Drake, A. Byon-Wagner, G. Foster and M. Lindgren. SMQIE: Challenges associated with a low frequency charge integrator and encoder for the CDF II Calorimeter, article, November 18, 1999; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc619204/: accessed September 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.