A novel baseline holder circuit (BLH) is proposed here, able to produce a stable baseline level at the output of a typical analog front-end channel for particle detectors, both at dc and at high rate operation. The circuit is suitable to be used in modern high-sensitivity gamma-ray medical imaging systems, where high gain shapers are required. A very low frequency pole, which is fundamental for the stability of the shaper-BLH loop, is realized by means of operational transconductance amplifiers (OTA), which allow to save area,making the circuit suitable for the integration in a standard CMOS technology. Non-linearity effects have been exploited to reduce the baseline shift at high input signal rates, due to the low dc gain of the shaper+BLH system. The circuit has been designed in a standard 0.35μm CMOS technology, and extensive simulations prove the effectiveness of the adopted solutions. A baseline drift of less than 1.8mV has been observed for a 30KHz input rate.
A Novel Baseline Holder Circuit for Nuclear Imaging Front-End Electronics / Corsi, Francesco; Foresta, M.; Marzocca, Cristoforo; Matarrese, Gianvito; Tauro, A.. - (2008), pp. 690-693. (Intervento presentato al convegno 15th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2008. tenutosi a Malta nel Aug. 31 2008-Sept. 3 2008) [10.1109/ICECS.2008.4674947].
A Novel Baseline Holder Circuit for Nuclear Imaging Front-End Electronics
CORSI, Francesco;MARZOCCA, Cristoforo;MATARRESE, Gianvito;
2008-01-01
Abstract
A novel baseline holder circuit (BLH) is proposed here, able to produce a stable baseline level at the output of a typical analog front-end channel for particle detectors, both at dc and at high rate operation. The circuit is suitable to be used in modern high-sensitivity gamma-ray medical imaging systems, where high gain shapers are required. A very low frequency pole, which is fundamental for the stability of the shaper-BLH loop, is realized by means of operational transconductance amplifiers (OTA), which allow to save area,making the circuit suitable for the integration in a standard CMOS technology. Non-linearity effects have been exploited to reduce the baseline shift at high input signal rates, due to the low dc gain of the shaper+BLH system. The circuit has been designed in a standard 0.35μm CMOS technology, and extensive simulations prove the effectiveness of the adopted solutions. A baseline drift of less than 1.8mV has been observed for a 30KHz input rate.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
