Study of Autozeroing Low-noise CTIA Readout Circuit
Infrared detectors have diverse applications in the defense and aerospace fields,and they rely on low-noise readout circuits for acquiring useful and clear infrared images.Detectors operating under high-background and weak-signal scenarios encounter issues such as substantial noise disturbances,uneven signals across elements,and unreadable signals.To satisfy the requirements for the application of infrared detectors in aerospace engineering in China,we designed a novel low-noise readout circuit based on the traditional capacitive transimpedance amplifier(CTIA)in this study.The circuit design utilized autozeroing technology and a new correlation double-sampling circuit with excellent noise suppression capability.We applied the proposed circuit to signal readouts in common midwave line-array infrared HgCdTe space detectors and other low-and normal-temperature detectors with operating temperatures within 77～300 K.Further,we performed simulation verification,followed by the tape-out of a 10 × 1 line-array readout circuit using a 0.35 μm 5 V CMOS process.Our results showed a total output noise of 72.1 μV,which was 44.7％lower than that of the traditional CTIA circuit.
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