Abstract: High-frequency analog chain of 512256 staring short wavelength (SW) infrared-focal-planearrays( IRFPAs) readout-integrated circuit(ROIC), focusing on coupling of weak signal, high-frame output and noise depression was implemented in this paper. The complete analog signal chain contained a novel input stage of capacitor feedback transimpedance amplifier (CTIA) preamplifier, a correlated double sampling (CDS) module,an amplifier of charge and complementary output stage. The simulation and verification were carried out both before and after completing the layout. The circuit's structure was analyzed according to low-temperature model. The result shows that the output dynamic range is 2.8 V and the frame rate is above 250 Hz with output of 8 channels. The CTIA ROIC chip fabricated with CSMC-6S05DPTM 0.5 m process technology is measured and proved to be consistent with the simulation.