An Electromagnetic Interference (EMI) Reduced High-Efficiency Switching Power Amplifier

The design of a new high-efficiency switching power amplifier with an ultralow-power spread spectrum clock generator (SSCG) is first reported in this paper. An effective low-power frequency modulation method is first proposed to reduce the electromagnetic interference of the pulse width modulation c...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2010-03, Vol.25 (3), p.710-718
Main Authors: Yeh, M-L, Liou, W-R, Hsieh, H-P, Lin, Y-J
Format: Article
Language:English
Subjects:
Class D amplifier
Clocks
Electromagnetic interference
electromagnetic interference (EMI)
Electromagnetism
Electronics
EMP radiation effects
Frequency modulation
Generators
High power amplifiers
Power amplifiers
Power efficiency
Power generation
Pulse amplifiers
Pulse duration modulation
Pulse width modulation
Receivers & amplifiers
Semiconductors
Spread spectrum communication
Spreads
Switching
total harmonic distortion (THD)
voltage feedback
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Summary:The design of a new high-efficiency switching power amplifier with an ultralow-power spread spectrum clock generator (SSCG) is first reported in this paper. An effective low-power frequency modulation method is first proposed to reduce the electromagnetic interference of the pulse width modulation class D power amplifier without degrading its power efficiency. Also, a simple RC voltage feedback circuit is used to reduce the total harmonic distortion (THD). This amplifier proves to be a cost-effective solution for designing high fidelity and high efficiency audio power amplifiers for portable applications. Measurement results show that the power efficiency and THD can reach 90% and 0.05%, respectively. The power dissipation of the SSCG is only 112 ¿W. The harmonic peaks of the switching frequency are greatly reduced when the SSCG technique is applied to the amplifier design. The impact of the SSCG on the THD of the class D power amplifier is also first reported in this paper. This switching power amplifier is implemented using a Taiwan Semiconductor Manufacture Company (TSMC) 0.35- ¿m CMOS process.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2009.2035622