Title :
ASD IC for the thin gap chambers in the LHC Atlas Experiment
Author :
Sasaki, Osamu ; Yoshida, Mitsuhiro
Author_Institution :
Inst. of Particle & Nucl. Studies, High Energy Accel. Res. Organ., Ibaraki, Japan
Abstract :
An amplifier-shaper-discriminator (ASD) chip was designed and built for Thin Gap Chambers in the forward muon trigger system of the LHC Atlas experiment. The ASD IC uses SONY Analog Master Slice bipolar technology. The IC contains 4 channels in a QFP48 package. The gain of its first stage (preamplifier) is approximately 0.8 V/pC and output from the preamplifier is received by a shaper (main-amplifier) with a gain of 7. The baseline restoration circuit is incorporated in the main-amplifier. The threshold voltage for discriminator section is common to the 4 channels and their digital output level is LVDS-compatible. The IC also has analog output of the preamplifier. The equivalent noise charge at input capacitance of 150 pF is around 7500 electrons. The power dissipation with LDVS outputs (100 /spl Omega/ load) is 59 mW/ch.
Keywords :
discriminators; mixed analogue-digital integrated circuits; muon detection; nuclear electronics; position sensitive particle detectors; preamplifiers; proportional counters; readout electronics; trigger circuits; 100 ohm; 150 pF; LHC Atlas Experiment; LVDS-compatible; QFP48 package; SONY Analog Master Slice bipolar technology; amplifier-shaper-discriminator chip; analog output; baseline restoration circuit; digital output; digital output level; equivalent noise charge; forward muon trigger system; main-amplifier; power dissipation; preamplifier; thin gap chambers; Analog integrated circuits; Bipolar integrated circuits; Integrated circuit noise; Integrated circuit packaging; Large Hadron Collider; Mesons; Noise shaping; Preamplifiers; Threshold voltage; Variable speed drives;
Journal_Title :
Nuclear Science, IEEE Transactions on
