Affiliation:
1. School of Electronic and Computer Engineering, Peking University Shenzhen China
Abstract
Dynamic X‐ray detecting for large area medical imaging requires
high‐gain and stable Active Pixel Sensor (APS) circuit integrated
with Thin Film Transistors (TFTs). In this paper, the APS circuit
using oxide TFTs is studied based on the small‐signal model, and
the charge gain and effects of threshold voltage shift (ΔVth) are
investigated. Detailed SPICE simulations show the charge gain of
the APS circuit of the oxide TFTs is 234 × of that of the
conventional a‐Si:H TFT PPS circuit.