【作者】 许志颖；

【导师】 张为； 陈育浩；

【作者基本信息】 天津大学 ， 电子与通信工程， 2009， 硕士

【摘要】 本文讨论了模拟电路设计者所面临的一些关于低功耗方面的问题,并对实现低功耗的设计方法进行了分析。本论文基于0.35umCMOS工艺,采用单电源电压(Vdd=3.3v),设计了一个恒定跨导Rail-to-Rail输入、AB类输出的工作在亚阈值区的低功耗运算放大器。运算放大器采用一个电流开关和一个电流镜并且结合工作在亚阈值区的互补差分对来保证输入级的恒定跨导。输出级采用低电压下的AB类控制输出级,从而使得整个运算放大器的功耗降低。偏置电路的基准电流是由一个与电源无关的“自举”偏置电路提供的。本文所设计的运算放大器基本满足Rail-to-Rail输入,并且功耗较低,达到预期目标。更多还原

【Abstract】 This paper studied some problems about low power which the analog circuit designer faced to, and analyzed the approaches for achieving low power. This paper basing on the 0.35 um CMOS techniques , adopting only one power supply (Vdd=3.3v) ,designs a invariable Gm Rail-to-Rail input stage, AB output stage working in the sub-threshold low power operation amplifier. Operation amplifier is adopted a current switch and a current mirror and difference pair that works in the sub-threshold to assure the invariable input stage’s Gm . Output stage is adopted low voltage AB control output stage to low the power of the operation amplifier. The reference current is supplied by the bias circuit of“raise by oneself”. The operation amplifier designed by this paper is almost satisfied of Rail-to-Rail input and low power, which achieve the goal.更多还原