Abstract
An integrated, 0.35μm CMOS fast shaping amplifier has been designed for coincidence detection and zero-cross time pulse shape discrimination (PSD) in PET, and for high rate event counting in CT with APD-based detectors. Analytical simulations of CR-RCn filters of various order and shaping time constant were carried out to optimize the timing performance, keeping in mind the stringent channel density requirements of the detector front-end electronics. The filter was implemented with the biquadratic bandpass architecture using a folded cascode transconductance amplifier. The electronic timing resolution of the coincidence circuit was 92ps in the ideal case without an APD (Cin = 0pF), and 243ps with an APD (Cin = 30pF). By comparison, the same system with the CMOS shaper replaced by an Ortec 579 Fast Filter Amplifier set to a shaping time of 10ns yielded an electronic time resolution of 79ps in the ideal case without capacitance, and 236ps with the APD. The 511keV coincidence time resolution for an LSO/APD detector was measured to be 1.49ns.
| Original language | English |
|---|---|
| Pages | 807-811 |
| Number of pages | 5 |
| State | Published - 2001 |
| Externally published | Yes |
| Event | 2001 IEEE Nuclear Science Symposium Conference Record - San Diege, CA, United States Duration: 4 Nov 2001 → 10 Nov 2001 |
Conference
| Conference | 2001 IEEE Nuclear Science Symposium Conference Record |
|---|---|
| Country/Territory | United States |
| City | San Diege, CA |
| Period | 4/11/01 → 10/11/01 |
Keywords
- CMOS
- Folded cascode transconductance amplifier
- PET
- Pulse shape discrimination
- Shaping amplifier