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设计了一款CMOS光电耦合隔离放大器(简称光电耦合放大器),其中输入放大器采用“套筒式”共源-共栅CMOS运放A1,输出放大器选用两级共源-共源CMOS运放A2,A1的输出信号经过两个光电耦合器反馈到输入回路,且A1、A2分别引入负反馈。此外,还采取了其他的改进措施。实验结果表明,与BiCMOS光电耦合放大器相比,所设计的CMOS光电耦合放大器的±3 dB带宽约增加14 kHz,功耗降低5.46 mW,增益线性度提高到5.9×10—5,因而特别适合于高线性度、低功耗的光电信号处理和智能检测系统中。
A CMOS optocoupler isolation amplifier (referred to as optocoupler amplifier) is designed. The input amplifier adopts a “sleeve type” common source-common-gate CMOS op amp A1, and the output amplifier uses two levels of common source-common source CMOS op amp A2, A1’s output signal is fed back to the input loop via two photocouplers, and A1 and A2 respectively introduce negative feedback. In addition, other improvements have been taken. The experimental results show that the ± 3 dB bandwidth of the designed CMOS optocoupler amplifier is increased by about 14 kHz compared with the BiCMOS optocoupler amplifier, the power consumption is reduced by 5.46 mW and the gain linearity is improved to 5.9 × 10 -5, which makes it particularly suitable for High linearity, low power consumption of optical signal processing and intelligent detection system.