›› 2012, Vol. 25 ›› Issue (5): 51-.

• Articles • Previous Articles     Next Articles

Design of an Improved Class AB Audio Power Amp

 HAN Hui, XUE Chao-Yao, MA Ren-Yue   

  1. (Institute of Electronic CAD,Xidian University,Xi'an 710071,China)
  • Online:2012-05-15 Published:2012-05-24

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

CLC Number: 

  • TN409