Thursday, May 2025

05:00 PM - 08:00 PM

Room: 220A

Session: Emerging Technologies and Applications Posters

A 1.33 µV/e- Voltage Mode Active Pixel Sensor with Threshold Voltage Compensation for Dynamic X-Ray Imaging

Distinguished

Description:

This paper proposes a high-gain voltage-mode active pixel sensor (V-APS) for high-frame-rate dynamic X-ray imaging. Due to a source-follower structure, the proposed active pixel circuit exhibits superior linearity compared to current-mode APS. And, a shared programmable gain amplifier (PGA) is employed to provide secondary-stage amplification, mitigating the gain limitation of the source-follower structure. The charge-to-voltage gain of the proposed V-APS achieves 1.33 µV/e- with a nonlinearity of 0.38%. Furthermore, VT variation and shift of amplifying transistors in pixels and PGAs can be compensated by using dual-gate thin-film transistor technology. In comparison with conventional 3-T V-APS, the proposed one features a significant decrease of output voltage error rate from 43.67% to 0.79% at a VT shift of ±0.5 V.