高精度CMOS DEM-CCⅡ放大器

High-Precision CMOS DEM-CCⅡ Amplifier

采用动态元件匹配二代电流传输器(DEM-CCⅡ)技术,设计了一种0.35μm标准工艺的高精度CMOS放大器。通过比较传统的CMOS运放可知,所设计的CMOS放大器既增大了输出摆幅又减小了输出阻抗,且有效地限制了有限的运放增益对电路性能的影响。仿真实验结果表明,该CMOS放大器增益误差比传统运放的增益误差小38～50倍,精度等级明显提高,因而特别适用于各类检测和信号调理放大器的设计中。

CMOS amplifiers with high-precision was designed in a standard 0.35 μm CMOS process by properly applying dynamic element matching to a second generation current conveyor. Compared with traditional CMOS circuits, the proposed approach alleviates the tradeoff between output swing and output resistance and is more robust against the finite operational amplifier gain. The simulation results show that the gain error is reduced 38 - 50 times than the gain error of operational amplifiers, and the precision is improved, it is very suitable for the design of various detections and signal conditioning amplifiers.