A Low Noise Highly Integrated Uncooled Infrared Imager with Internal Fast Startup Biasing

摘要

Highly integrated uncooled infrared imagers with micro-bolometer detectors usually feature on-chip low dropout regulators, biasing, non-uniformity correction and analog-to-digital converters. In this work, we presented a full-digital low-noise readout integrated circuit(ROIC) with single analog power supply and enhanced biasing noise rejection. A novel multiple biasing generator is proposed which significantly reduces the startup time when powered up and keeps low noise equivalent temperature difference(NETD) contribution. To test the proposed scheme, a 384×288 array format uncooled infrared detector with 17μm pixel pitch is designed and fabricated in 0.18μm CMOS process. Simulated RMS noise of the biasing voltage for skimming resistors is below 7μV and the startup time is reduced to 40ms.