title: Design and integration of a high accuracy multichannel analog CMOS peak detect and hold circuit for APD-based PET imaging.
abstract: This paper presents the design of a high accuracy multichannel peak detect and hold (PDH) circuit. This PDH measures the energy of an event and is one part of a readout chain for avalanche photo diodes (APD)-based positron emission tomography (PET) imaging. The circuit is designed in a 0.35μm CMOS process. The proposed PDH is dedicated to ultra low amplitude, large amplitude range from several tens millivolts to 1.1 V, and fast peaking time (190 ns) semi-Gaussian pulses. The two-phase technique has been used to cancel the major error source of the classical CMOS PDH: offset. A two-gain OTA is applied to minimize the DC error. A peak error less 1% for a small input signal (amplitude is between 40 mV and 300 mV) and a peak error less than 0.2% for a large input signal (amplitude is between 300 mV and 1.1 V) have been obtained from test. The area of a PDH is equal to about 200 μm × 40 μm. In our PDH system, the drop rate is negligible.
authors.affiliation: Institut Pluridisciplinaire Hubert Curien (IPHC), UMR 7178 CNRS/ULP, 67037 Strasbourg, France. xiaochao.fang@ires.in2p3.fr
authors.forename: Xiaochao
authors.initials: X
authors.lastname: Fang
authors.forename: David
authors.initials: D
authors.lastname: Brasse
authors.forename: Christine
authors.initials: C
authors.lastname: Hu-Guo
authors.forename: Yann
authors.initials: Y
authors.lastname: Hu
mesh_terms: D000669:Amplifiers, Electronic; D003198:Computer Simulation; D004867:Equipment Design; D008670:Metals / Q000737:chemistry; D010087:Oxides / Q000737:chemistry; D049268:Positron-Emission Tomography / Q000295:instrumentation* / Q000379:methods*; D012666:Semiconductors; D012815:Signal Processing, Computer-Assisted; D013997:Time Factors
chemical_list: D008670:Metals; D010087:Oxides