A novel low power consumption and quasilinear CMOS optically coupled isolation amplifier

摘要

A kind of novel CMOS optically coupled isolation amplifier (OCIA) composed of two operational amplifiers (OAs) is present. To improve the linearity and reduce the power consumption, the negative feedback signal is introduced to the input loop through two photoelectric coupled devices. Besides, other improvement actions are taken in this amplifier. Experimental results show that compared with the BiCMOS OCIA, the ±3 dB bandwidth of this amplifier increases about 14 kHz, the power consumption (PD) reduces 5.46 mW, and the gain linearity increases to 5.9×10−5. Its delay-power product is about 25.7 nJ, far lower than that of BiCMOS. So this amplifier is very suitable for high-linearity, low power consumption photoelectric signal processing and intelligent detecting systems.