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Title: A monolithic preamplifier-shaper for measurement of energy loss and transition radiation

Abstract

A custom monolithic circuit has been developed for the Time Expansion Chamber (TEC) of the PHENIX detector at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory (BNL). This detector identifies particles by sampling their ionization energy loss (dE/dx) over a 3 cm drift space and by detecting associated transition radiation (TR) photons. The requirement of being simultaneously sensitive to dE/dx and TR events requires a dual-gain system. The authors have developed a compact solution featuring an octal preamplifier/shaper (P/S) IC with a split gain stage. The circuit, fabricated in 1.2 {micro}m CMOS process, incorporates a trans-impedance preamplifier and a 70 ns unipolar CR-RC{sup 4} shaper with ion tail compensation and active DC offset cancellation. Digitally selectable gain, peaking time, and tail cancellation as well as channel-by-channel charge injection and disable can be configured in the system via a 3-wire interface. The 3.5 {times} 43.5 min{sup 2} die is packaged in a fine pitch 64-pin PQFP. Equivalent input noise is less than 1500 rms electrons at a power dissipation of 30 mW per channel. On a sample of 2400 chips, the DC offset was 2.3 {+-} 3 mV rms without trimming. A chamber-mounted TEC-PS Printed Circuit Board (PCB) housesmore » four P/S chips, on-board calibration circuit, and 64 analog differential line drivers which transmit the shaped pulses to crate-mounted flash ADC`s 7 m apart. An RS-422 link provides digital configuration downloading and read back, and supplies the calibration strobe. The 24.6 cm {times} 9.5 cm board dissipates 8.5 W.« less

Authors:
; ;  [1];  [2]
  1. Brookhaven National Lab., Upton, NY (United States)
  2. Rensselaer Polytechnic Inst., Troy, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
679546
Report Number(s):
CONF-981110-
Journal ID: IETNAE; ISSN 0018-9499; TRN: 99:009478
DOE Contract Number:  
AC02-98CH10886
Resource Type:
Journal Article
Journal Name:
IEEE Transactions on Nuclear Science
Additional Journal Information:
Journal Volume: 46; Journal Issue: 3Pt1; Conference: 1998 IEEE nuclear science symposium and medical imaging conference, Toronto (Canada), 10-12 Nov 1998; Other Information: PBD: Jun 1999
Country of Publication:
United States
Language:
English
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; 43 PARTICLE ACCELERATORS; BROOKHAVEN RHIC; PARTICLE IDENTIFICATION; ENERGY LOSSES; TRANSITION RADIATION; INTEGRATED CIRCUITS; PULSE CIRCUITS; PRINTED CIRCUITS; TIME PROJECTION CHAMBERS; READOUT SYSTEMS

Citation Formats

Kandasamy, A, O`Brien, E, O`Connor, P, and Von Achen, W. A monolithic preamplifier-shaper for measurement of energy loss and transition radiation. United States: N. p., 1999. Web. doi:10.1109/23.775505.
Kandasamy, A, O`Brien, E, O`Connor, P, & Von Achen, W. A monolithic preamplifier-shaper for measurement of energy loss and transition radiation. United States. https://doi.org/10.1109/23.775505
Kandasamy, A, O`Brien, E, O`Connor, P, and Von Achen, W. 1999. "A monolithic preamplifier-shaper for measurement of energy loss and transition radiation". United States. https://doi.org/10.1109/23.775505.
@article{osti_679546,
title = {A monolithic preamplifier-shaper for measurement of energy loss and transition radiation},
author = {Kandasamy, A and O`Brien, E and O`Connor, P and Von Achen, W},
abstractNote = {A custom monolithic circuit has been developed for the Time Expansion Chamber (TEC) of the PHENIX detector at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory (BNL). This detector identifies particles by sampling their ionization energy loss (dE/dx) over a 3 cm drift space and by detecting associated transition radiation (TR) photons. The requirement of being simultaneously sensitive to dE/dx and TR events requires a dual-gain system. The authors have developed a compact solution featuring an octal preamplifier/shaper (P/S) IC with a split gain stage. The circuit, fabricated in 1.2 {micro}m CMOS process, incorporates a trans-impedance preamplifier and a 70 ns unipolar CR-RC{sup 4} shaper with ion tail compensation and active DC offset cancellation. Digitally selectable gain, peaking time, and tail cancellation as well as channel-by-channel charge injection and disable can be configured in the system via a 3-wire interface. The 3.5 {times} 43.5 min{sup 2} die is packaged in a fine pitch 64-pin PQFP. Equivalent input noise is less than 1500 rms electrons at a power dissipation of 30 mW per channel. On a sample of 2400 chips, the DC offset was 2.3 {+-} 3 mV rms without trimming. A chamber-mounted TEC-PS Printed Circuit Board (PCB) houses four P/S chips, on-board calibration circuit, and 64 analog differential line drivers which transmit the shaped pulses to crate-mounted flash ADC`s 7 m apart. An RS-422 link provides digital configuration downloading and read back, and supplies the calibration strobe. The 24.6 cm {times} 9.5 cm board dissipates 8.5 W.},
doi = {10.1109/23.775505},
url = {https://www.osti.gov/biblio/679546}, journal = {IEEE Transactions on Nuclear Science},
number = 3Pt1,
volume = 46,
place = {United States},
year = {1999},
month = {6}
}