摘要
利用single endedfolded cascode结构和MOS管工作在线性区做反馈电阻,实现了一种在77K工作的高性能低功耗、低噪声前置放大器.分析了它的噪声特性,提出了减少噪声的措施.此前置放大器用1.2μm的标准CMOS工艺制造完成.经过测试,这种前置放大器在低温77K下能正常工作,反馈电阻大小为兆欧级,线性度达到了1%,等效输入噪声电流仅0.03pA/Hz,功耗小于1mW.
A high-performance low-power low-noise preamplifier working at 77K for IR detectors is designed by a single-ended folded-cascode structure and a MOS transistor operating in the linear region as feedback resistor.Its noise characteristics are analyzed and the methods for decreasing noise are put forward.This preamplifier is fabricated with 1.2μm CMOS technology.The test result shows that the preamplifier can work at 77K,its feedback resistance is more than 10 6Ω,its linearity reaches 1%,the equivalent input noise current is 0.03pA/Hz,and the power consumption is less than 1mW.
