一种新型的CMOS恒定电流源的设计  

Design of a New CMOS Constant Current Reference

作　　者：张宇鸣[1] 吴谨[1] ZHANG Yu-ming, WU Jing （IC College,Southeast University,Nanjing 210096,China）

机构地区：[1]东南大学IC学院,江苏南京210096

出　　处：《电脑知识与技术》2008年第10期218-221,共4页Computer Knowledge and Technology

摘　　要：在一个模拟或者混合信号系统中，恒定电流源为电路提供偏置，它的稳定性直接决定了电路的性能。该文通过设计合适的电路，利用不同工艺条件下跨导参数K’和阈值电压Vt之间的变化关系来消除工艺变化对电流的影响。另外，通过一个随温度变化的电压源对电源电压和温度进行补偿。整个电路采用CSMC 0．5um双层多晶硅，双层金属标准工艺来设计．采用candence spectre进行模拟仿真，仿真结果证明电路对工艺，温度及电压的变化都具有良好的补偿能力。Providing bias current into different blocks in any analog or mixed-signal system, constant current reference casts some important influence on the performance of a whole circuit . By exploiting the physical relationship between K＇and Vt across various process corners,we design a kind of circuit to deliminish the influence of variations of different process. Using a PTAT voltage reference, the circuit also can compensate power supply and temperature variations.The circuit is implemented by CSMS 0.6um process and simulated with candence spectre.The result show the circuit has high PSRR and can compensate process variations and temperature variations well.

关 键 词：工艺补偿 温度补偿 电流基准源 

分 类 号：TN431[电子电信—微电子学与固体电子学]