1. An integrated readout circuit for personal dosimetry with phase-shift compensation technique to improve stability
- Author
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Li Jing, Chen Zhongjian, Zhou Chunzhi, An Huiyao, Zhang Yacong, and Shao Jianhui
- Subjects
Engineering ,business.industry ,Detector ,General Engineering ,Electrical engineering ,Phase margin ,Chip ,Noise (electronics) ,Particle detector ,Power (physics) ,Compensation (engineering) ,CMOS ,Electronic engineering ,business - 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 0.35µm CMOS technology. It occupies an area of 2.113i?0.81mm2. 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 330µW with a 3.3V power supply. Ac-coupled to a silicon PIN detector, it successfully detects s-rays.
- Published
- 2011