The Integration of High Efficiency Class-D Audio Power Amplifier with PWM DC/DC Buck Converter
碩士 === 國立臺北大學 === 電機工程研究所 === 99 === Consumers desire the new generation of devices will be developed in smaller physical size and lower cost than existing devices, and furthermore enhance the function and the battery life. The integration of high efficiency circuit make the product more popular wit...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2011
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| Online Access: | http://ndltd.ncl.edu.tw/handle/99875049041023566865 |
| Summary: | 碩士 === 國立臺北大學 === 電機工程研究所 === 99 === Consumers desire the new generation of devices will be developed in smaller physical size and lower cost than existing devices, and furthermore enhance the function and the battery life. The integration of high efficiency circuit make the product more popular with consumers of all ages. This paper presents the design of an integrated class D audio power amplifier with step-down (Buck) DC to DC converter. The high efficiency pulse-width modulation (PWM) buck converter is used to supply 1.5V for the class D power amplifier and other loads. The operating voltage range can be from 3V to 5V which is used for mobile devices. The class D power amplifier uses the three level pulse width modulation (PWM) to eliminate the external output low-pass filter. The circuit is designed with TSMC 0.35μm 2P4M 3.3V/5V mixed-signal CMOS process. The best total power efficiency of this integrated circuit achieves 85%, and the total harmonic distortion (THD) is less than 0.08% at 10 KHz with 8Ω load.
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