一款改进型AB类音频功率放大器的设计

›› 2012, Vol. 25 ›› Issue (5): 51-.

一款改进型AB类音频功率放大器的设计

韩辉,薛超耀,马任月

(西安电子科技大学电路CAD研究所,陕西西安 710071)

出版日期:2012-05-15 发布日期:2012-05-24
作者简介:韩辉(1986—),男,硕士研究生。研究方向:数模混合电路与功率系统集成。

Design of an Improved Class AB Audio Power Amp

HAN Hui, XUE Chao-Yao, MA Ren-Yue

(Institute of Electronic CAD,Xidian University,Xi'an 710071,China)

Online:2012-05-15 Published:2012-05-24

摘要/Abstract

摘要：

设计了一种全差分高增益AB类音频功率放大器。该运算放大器利用电流抵消技术以提高增益,并采用一种改进型AB类推挽式输出级结构得到大电流驱动能力和宽摆幅。在0.35 μm CMOS工艺条件仿真得到该运算放大器在5 V电源电压下,开环增益为97.4 dB。输出摆幅范围0.07~4.91 V,静态功耗2.96 mW,功率管的面积＜0.2 mm²,在保证一定指标的前提下节省了芯片面积。

关键词: 音频功率放大器, 电流抵消技术, AB类推挽式输出级, 宽摆幅

Abstract:

A fully differential OP-AMP with a high gain and a class-AB output stage is designed in this paper.The technology of eliminating the current is used to achieve a high gain and an improved Class AB push-pull output stage is used to achieve a large current ability and a wide output swing.The operational amplifier is designed and simulated in a 0.35 μm CMOS process.With a 5 V power supply,the amplifier achieves an open loop gain of 97.4 dB with an output swing of 0.07~4.91 V,and dissipates 2.96 mW.The area of the power tube was less than 0.2 Square millimeters which diminishes the area of IC enormously in the premise of guaranteeing a certain index.

Key words: audio power amplifer;the technology of eliminating the current;a class AB output stage;wide output swing

中图分类号:

TN409

韩辉, 薛超耀, 马任月. 一款改进型AB类音频功率放大器的设计[J]. , 2012, 25(5): 51-.

HAN Hui, XUE Chao-Yao, MA Ren-Yue. Design of an Improved Class AB Audio Power Amp[J]. , 2012, 25(5): 51-.