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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.
Based on the understanding of nonlinearity and component mismatch of CMOS differential amplifier, an offset cancellation technique applied to low voltage CMOS differential amplifier is proposed, which is based on eliminating the need of increasing power consumption, The offset voltage is transferred to the other nodes of the differential amplifier so as to reduce the offset voltage of the input reference.In order to verify this technique, a low offset CMOS differential amplifier with a working voltage of 1.8V has been designed.The simulation results show that at Using this offset transfer technique, the offset of the input reference can be reduced by 40% as the load transistor mismatch is 20% and the input amplifier tube mismatch is 10%. In contrast to published offset cancellation techniques, Can achieve lower power consumption and higher integration.