An integrated readout circuit for personal dosimetry with phase-shift compensation technique to improve stability

  • Authors:

  • Zhang Yacong;Li Jing;Chen Zhongjian;An Huiyao;Zhou Chunzhi;Shao Jianhui

  • Affiliations:

  • Key Laboratory of Microelectronic Devices and Circuits, Institute of Microelectronics, Peking University, 100871, China;Key Laboratory of Microelectronic Devices and Circuits, Institute of Microelectronics, Peking University, 100871, China;Key Laboratory of Microelectronic Devices and Circuits, Institute of Microelectronics, Peking University, 100871, China;Key Laboratory of Microelectronic Devices and Circuits, Institute of Microelectronics, Peking University, 100871, China;Research Institute of Chemical Defense, China;Research Institute of Chemical Defense, China

  • Venue:
  • Microelectronics Journal
  • Year:
  • 2011

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Abstract

In this paper an integrated CMOS readout circuit for a radiation detector in a personal dosimeter is presented. High counting rate and low power requirements make the stability of the conventional high-pass pulse shaper a big problem. A novel phase-shift compensation method is proposed to improve the phase margin. The principle of the compensation circuit and its influence on noise performance are analyzed theoretically. A readout chip with two channels of conventional structure and one channel of the proposed structure has been implemented in a 0.35@mm CMOS technology. It occupies an area of 2.113x0.81mm^2. Measurement results show that the proposed channel can process up to 1MHz counting rate and provide a conversion gain of about 170mV/fC at a power dissipation of 330@mW with a 3.3V power supply. Ac-coupled to a silicon PIN detector, it successfully detects @b-rays.