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基于SMIC 0.18μm CMOS混合信号工艺,设计了一种适用于体局域网(BAN)的自校准逐次逼近型模数转换器(SAR ADC)。基于BAN系统的特点,设计的SAR ADC采用阻容混合型主数模转换器(DAC)及电容型校准DAC等结构。采用误差自校准技术来校准SAR ADC的阻容混合型主DAC的高5位电容失配误差,有效降低了SAR ADC非线性误差。仿真结果表明,自校准SAR ADC获得了±0.3LSB微分非线性、±1LSB积分非线性、82.2dB信噪比等性能特性。设计的SAR ADC具有良好的性能,适合于BAN系统。
Based on the SMIC 0.18μm CMOS mixed signal process, a self-calibrating successive approximation analog-to-digital converter (SAR ADC) for body local area network (BAN) is designed. Based on the characteristics of the BAN system, the SAR ADC is designed with a resistor-capacitor hybrid master digital-to-analog converter (DAC) and a capacitive calibration DAC. The error self-calibration technique is used to calibrate the high-order 5-bit capacitor mismatch error of the RC ADC with RC ADC, which effectively reduces the SAR ADC nonlinearity error. The simulation results show that the self-calibrating SAR ADC achieves the performance characteristics of ± 0.3LSB differential nonlinearity, ± 1LSB integral nonlinearity and 82.2dB signal-to-noise ratio. SAR ADC designed with good performance, suitable for BAN system.