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A transimpedance CMOS multichannel amplifier with a 50 Ω-wide output range buffer for high counting rate applications

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4 Author(s)
N. Haralabidis ; Inst. of Microelectron., Athens, Greece ; D. Loukas ; K. Misiakos ; S. Katsafouros

A fast transimpedance multichannel amplifier has been designed, fabricated in CMOS 1.2-μm technology and tested. Each channel consists of a current sensitive preamplifier followed by a voltage amplification stage and an on-chip buffer able to drive 50 Ω loads with an output range of ±800 mV. Measured peaking time at the output is 40 ns and the circuit recovers to baseline in 90 ns. This results in a counting capability of more than 107 hits/s, Signals of both polarities can be handled. The first two stages consume a total of 2 mW per channel and the 50 Ω buffer consumes another 17 mW. The equivalent noise charge (ENC) is 1100 e- rms with a slope of 40e-/pF. The IC is intended for use in gas and solid-state detectors with high particle rate and extensive charge release as in high energy calorimetry

Published in:

IEEE Journal of Solid-State Circuits  (Volume:32 ,  Issue: 1 )