| Citation: |
Cao Zhengxin, Xiong Shaozhen. A New Structure for a CMOS Audio Power AMP with Extremely Low THD and Low Power Consumption[J]. Journal of Semiconductors, 2006, 27(9): 1552-1556.
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Cao Z X, Xiong S Z. A New Structure for a CMOS Audio Power AMP with Extremely Low THD and Low Power Consumption[J]. Chin. J. Semicond., 2006, 27(9): 1552.
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A New Structure for a CMOS Audio Power AMP with Extremely Low THD and Low Power Consumption
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Abstract
A new system-corrected CMOS audio power AMP is presented.Consisting of four single-end OPAs,this structure is a pseudo-differential system.Compared to conventional CMOS power AMPs,it has the merits of low power consumption,extremely low THD,easy compensation,and good driving capability.With 1st silicon 0.25μm 1P4M CMOS technology and a 3V power supply,the output range can be 4Vpp when driving an 8Ω‖300pF load,while its power dissipation is less than 3mW.The THD is better than 0.003% at 1kHz.A new over-current protection circuit,which can effectively protect the power output circuits on the chip,is also demonstrated. -
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