【摘要】 基于对CMOS差分放大器的非线性和元件失配理解的基础上,提出了一种应用于低电压CMOS差分放大器的失调取消技术.这种技术在不需要增加功耗的基础上,通过把输出端的失调电压转移到差分放大器的其他节点,从而达到减小输入参考的失调电压的目的.为了验证这种技术,设计了一个工作电压为1·8V的低失调的CMOS差分放大器.仿真结果表明,在负载晶体管的失配为20 %,输入放大管的失配为10 %时,利用这种失调转移技术,输入参考的失调可以减少40 %.同已发表的失调取消技术相比,利用这种技术可以达到更低的功耗和更高的集成度.更多还原

【Abstract】 Based on a physical understanding of nonlinearity and mismatch,a novel offset-cancellation technique for low voltage CMOS differential amplifiers is proposed.The technique transfers the offset voltage from the output to other parts of the differential amplifier and can greatly reduce the input-referred offset voltage without extra power consumption.A 1.8V CMOS differential amplifier is implemented in 0.18μm CMOS process using the proposed technique.The simulation results show that the technique could reduce the input-referred offset voltage of the amplifier by 40% with a 20% load transistor mismatch and a 10% input differential transistor mismatch.Moreover,the proposed technique consumes the least power and achieves the highest integration among various offset-cancellation techniques.更多还原