采用120nm CMOS技术的新型恒跨导控制的全差分轨对轨输入运放

Proceedings of the International Conference Mixed Design of Integrated Circuits and System, 2006. MIXDES 2006. Pub Date : 2006-06-22 DOI:10.1109/MIXDES.2006.1706587

W. Yan, H. Zimmermann

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引用次数: 2

摘要

提出了一种具有轨对轨输入输出性能的全差分运算放大器，该放大器采用一种新的恒小、恒大信号行为控制方法和一种新的对称差分ab类输出。小信号偏差仅被抑制在1.6%以内，是所有恒行为轨对轨输入级设计中效果最好的。通过适当的补偿，运放能够将高欧姆负载驱动到100欧姆或高于50pF的容性负载。由于输出级采用对称推挽结构，减少了总谐波失真。在1.5V电源和10pF容性负载下，该运放的低频增益和单位增益带宽分别为77dB和4.7MHz。该芯片采用120nm数字CMOS技术制造

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Fully Differential Rail-to-rail Input Opamp With Novel Constant-transconductance Control In 120nm CMOS Technology

A fully differential operational amplifier featured with rail-to-rail input and output performance, realized by a novel method of constant small- and large-signal behavior control as well as a new symmetrical differential class-AB output is proposed. The small-signal deviation is suppressed within only 1.6%, which is the best result achieved among all the constant behavior rail-to-rail input-stage designs. With suitable compensation, the opamp is able to drive heavy ohmic load down to 100ohm or capacitive load higher than 50pF. Also the total harmonic distortion is reduced owing to the symmetrical push-pull structure for the output stage. With a 1.5V power supply and a capacitive load of 10pF, the low-frequency gain and unity-gain bandwidth of the opamp are 77dB and 4.7MHz, respectively. The chip was fabricated in 120nm digital CMOS technology

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Proceedings of the International Conference Mixed Design of Integrated Circuits and System, 2006. MIXDES 2006.

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