PVT variation에 강인한 Pseudo-Resistor가 적용된 방사선 검출기

다국어 초록 (Multilingual Abstract)

In this paper, we propose a radiation detector incorporating a pseudo-resistor (PR) resilient to PVT variation. To mitigate the equivalent noise charge (ENC) originating from the detector system noise, we designed a low-noise amplifier. We implemented the robust PR with resistance to PVT variations in a compact form and integrated it into the charge sensitive amplifier (CSA) feedback structure. The proposed circuit is designed using a 0.18 μm CMOS process and operates at a supply voltage of 3.3 V. The core amplifier of the radiation detector utilizes a cascode structure with a voltage gain of 86.7 dB and a bandwidth of 37.0 MHz. The input referred noise is 8 nV/√Hz at 1 kHz. The PR is implemented with a small area of 125×100 μm², achieving a large resistance of 250 MΩ. The standard deviation of the PR resistance due to process mismatch is 25 MΩ, demonstrating resilience to process variations. When Si beta particles with an energy of 17 keV are incident on the radiation detector, the ENC for channel 1 using a 50 fF feedback capacitor is 376.9 e<SUP>-</SUP> rms with an SNR of 13.1. For channel 2 using a 100 fF feedback capacitor, the ENC is 325.9 e<SUP>-</SUP> rms with an SNR of 14.3.