基于SMIC 55nm的电机马达MCU-ADC设计

Design of Motor MCU-ADC Based on SMIC 55nm

阐述基于SMIC 55nm CMOS工艺,设计了一款应用于MCU系统中的数模转换器。该MCU主要应用于电机马达控制领域,对MCU中ADC也有相应的要求。低功耗要求下,采用了逐次逼近型数模转换器(SAR ADC)。该ADC工作电压3.3V,设计精度分辨率为12bit,采样频率做成可调1Ms/s、2Ms/s、1.5Ms/s、3Ms/s。仿真结果表明,有效位数达到11.3bit。

Based on SMIC 55 nm CMOS process, this paper designs a digital-to-analog converter applied in MCU system.This MCU is mainly used in the field of motor control, and also has corresponding requirements for the ADC in the MCU. Under the requirement of low power consumption, a successive approximation digital-to-analog converter(SAR ADC) is used. The working voltage of the ADC is 3.3 V, the design accuracy is 12 bit, and the sampling frequency is adjustable to 1 Ms/s, 2 Ms/s, 1.5 Ms/s, and 3 Ms/s. The simulation result shows that the effective number of digits reaches 11.3 bit.