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设计了一款用于汽车电子MCU的轨至轨10位逐次逼近A/D转换器。采用单电容采样的DAC结构,保证A/D转换器的全摆幅输入范围。在后仿真验证中,采用频谱分析方法,标定寄生电容对DAC精度的影响,优化了版图结构。设计了片内低压差线性稳压器,提供稳定的电源电压信号。芯片采用GSMC 0.18μm 1P6M CMOS工艺实现。后仿真结果表明,在1.8V电源电压、51kHz输入信号频率、1MHz时钟频率下,无杂散动态范围(SFDR)为73.596dB,有效位数(ENOB)达到9.78位,整体功耗2.24mW,满足汽车电子MCU的应用需求。
A 10-bit track-to-rail successive approximation A / D converter for automotive MCUs is designed. Single-capacitor sampling DAC structure to ensure that the A / D converter full swing input range. In the post-simulation verification, spectrum analysis is used to calibrate the influence of parasitic capacitance on DAC accuracy and optimize the layout structure. An on-chip low-dropout linear regulator is designed to provide a stable supply voltage signal. Chip using GSMC 0.18μm 1P6M CMOS technology to achieve. The post-simulation results show that the SFDR is 73.596dB, the effective bit number (ENOB) is 9.78 bits, the overall power consumption is 2.24mW under the condition of 1.8V supply voltage, 51kHz input signal frequency and 1MHz clock frequency, Automotive electronic MCU application needs.