An integrated readout circuit for personal dosimetry with phase-shift compensation technique to improve stability
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?m CMOS technology. It occupies an area of 2.1130.81mm2. 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 330?W with a 3.3V power supply. Ac-coupled to a silicon PIN detector, it successfully detects ?-rays.
readout circuit personal dosimetry phase-shift compensation stability radiation detection