A low-noise CMOS front-end for TOF-PET

作者：Rolo M D^*; Alves L N; Martins E V; Rivetti A; Santos M B; Varela J

来源：Journal of Instrumentation, 2011, 6: P09003.

DOI：10.1088/1748-0221/6/09/P09003

• Analogue electronic circuits
• Front-end electronics for detector readout
• Solid state detectors
• Gamma camera, SPECT, PET PET/CT, coronary CT angiography (CTA)

An analogue CMOS front-end for triggering and amplification of signals produced by a silicon photomultiplier (SiPM) coupled to a LYSO scintillator is proposed. The solution is intended for time-of-flight measurement in compact Positron Emission Tomography (TOF-PET) medical imaging equipments where excellent timing resolution is required (approximate to 100 ps). A CMOS 0.13 mu m technology was used to implement such front end, and the design includes preamplification, shaping, baseline holder and biasing circuitry, for a total silicon area of 500x90 mu m. Waveform sampling and time-over-threshold (ToT) techniques are under study and the front-end provides fast and shaped outputs for time and energy measurements. Post layout simulation results show that, for the trigger of a single photoelectron, the time jitter due to the pre-amplifier noise can be as low as 15 ps (FWHM), for a photodetector with a total capacitance of 70 pF. The very low input impedance of the pre-amplifier (approximate to 5 Omega) allows 1.8 ns of peaking time, at the cost of 10 mW of power consumption.

• 出版日期2011-9