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Fully differential folded cascode CMOS operational amplifier having adaptive biasing and common mode feedback circuits
Fully differential folded cascode CMOS operational amplifier having adaptive biasing and common mode feedback circuits
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机译:具有自适应偏置和共模反馈电路的全差分折叠共源共栅CMOS运算放大器
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摘要
An adaptive biasing circuit is combined to a fully differential cascode operational amplifier ("OP AMP") to eliminate the effect of a slew rate, thereby increasing the operation speed of the OP AMP while maintaining a high DC voltage gain. A common mode feedback circuit with a large input common mode voltage range is also connected to the OP AMP, thereby maximizing a linear output voltage swing range. The common mode feedback circuit comprises a nMOS input stage differential amplifier and a pMOS input stage differential amplifier which are connected in parallel, and a push-pull CMOS amplifier for converting current outputs from the nMOS and the pMOS input stage differential amplifiers to an output voltage signal. The adaptive bias circuit comprises an operational transconductance amplifier, two current subtractor circuits and four output transistors.
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机译:自适应偏置电路与全差分共源共栅运算放大器(“ OP AMP”)结合使用,以消除压摆率的影响,从而在保持高DC电压增益的同时提高了OP AMP的工作速度。具有大输入共模电压范围的共模反馈电路也连接到运算放大器,从而最大化了线性输出电压摆幅范围。共模反馈电路包括并联连接的nMOS输入级差分放大器和pMOS输入级差分放大器,以及用于将nMOS和pMOS输入级差分放大器的电流输出转换为输出电压的推挽CMOS放大器。信号。自适应偏置电路包括一个运算跨导放大器,两个电流减法器电路和四个输出晶体管。
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