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讨论了开关电流镜不匹配典型来源,基于开关电流电路采用宽长比定标设计的特性分析了最主要的3个失配参数:跨导、域值电压及亚阈值斜率。采用Hspice平台及0.18 um BSIM3_V3.1 SPICE模型给出了开发了用于仿真的电路模型,针对主要失配因素,分析提取了仿真模型参数并进行了分组。在弱反型和强反型2种运行规则条件下,对失配的情况进行了仿真和分析。对开关电流浮栅电流镜提供的失配补偿能力也进行了仿真验证,并给出2种运行规则失配补偿分析和模拟结果,对单一工作点和较宽动态范围条件下失配补偿效果也进行了对比。
The typical sources of switching mismatch are discussed. The main three mismatch parameters are analyzed based on the characteristics of the switching current circuit with aspect ratio scaling: transconductance, threshold voltage and subthreshold slope. Using Hspice platform and 0.18 um BSIM3_V3.1 SPICE model, the circuit model for the simulation was developed. According to the main mismatch factors, the simulation model parameters were extracted and grouped. Under the condition of weak inversion and strong inversion, the mismatch conditions are simulated and analyzed. The mismatch compensation capability of the switch current floating-gate current mirror is also verified by simulation. The mismatch compensation analysis and simulation results of the two operating rules are also given. For a single operating point and a wide dynamic range, the mismatch compensation effect is also Made a contrast.