一个1.2V轨对轨输出驱动放大器，具有折叠的ab类输出级控制电路

2018 IEEE International Conference on Integrated Circuits, Technologies and Applications (ICTA) Pub Date : 2018-11-01 DOI:10.1109/CICTA.2018.8706103

Fanyang Li, Xiaoquan Liu, Jiwei Huang, Tao Yang

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引用次数: 0

摘要

本文提出了一种用于助听器扬声器驱动的1.2V轨对轨输出驱动放大器。由于级联放大器的线性度随电源电压的降低而降低，因此采用三级级联放大器。对于高线性度的轨对轨输出信号，在放大器中加入了专用的折叠ab类输出级电流控制电路。最小电源电压可降至VGS+2|Vdsat|。该放大器采用0.18 $\mu \ maththrm {m}$ CMOS工艺制作，负载电阻为100ohm，在1.2V电源和1kHz正弦波输入下实现-85dB THD。

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A 1.2V rail to rail output driving amplifier with a folded Class-AB output stage control circuit

A 1.2V rail to rail output driving amplifier used to drive the hearing aid loudspeaker is proposed in this paper. Since the linearity of the cascoded amplifier degrades with the supply voltage decreasing, a three-stage cascaded amplifier is adopted. For the rail to rail output signal with high linearity, a special folded class-AB output stage current control circuit is incorporated in the amplifier. The minimum supply voltage can be reduced to VGS+2|Vdsat|. Fabricated with a 0.18 $\mu \mathrm{m}$ CMOS process, the amplifier with the loading resistance 100ohm achieves -85dB THD while operating from a 1.2V supply and using a 1kHz input sine wave.

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2018 IEEE International Conference on Integrated Circuits, Technologies and Applications (ICTA)

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