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- 저자 : Wonho Tak (검색결과 1 건)
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A 0.018% THD+N, 88-dB PSRR PWM Class-D Amplifier for Direct Battery Hookup
Youngkil Choi,Wonho Tak,Younghyun Yoon,Jeongjin Roh,Sunwoo Kwon,Jinseok Koh IEEE 2012 IEEE journal of solid-state circuits Vol.47 No.2
<P>A low-distortion third-order class-D amplifier that is fully integrated into a 0.18-μ m CMOS process was designed for direct battery hookup in a mobile application. A class-D amplifier for direct battery hookup must have a sufficiently high power supply rejection ratio (PSRR) in preparation for noise, such as when a global system for mobile communications (GSM) bursts ripples through the system power line. This amplifier has a high PSRR of 88 dB for 217-Hz power supply ripples, using a third-order loop filter. System performance and stability are improved by applying the design technique of input-feedforward delta-sigma (ΔΣ) modulators to the pulse-width modulation (PWM) class-D amplifier. A filterless method that can remove the external LC filter is employed, which offers great advantages in terms of PCB space and system cost. This amplifier achieves a power efficiency of 85.5% while delivering an output power of 750 mW into an 8-Ω load from a 3.7-V supply voltage. Maximum achieved output power at 1% total harmonic distortion plus noise (THD+N) from a 4.9-V supply voltage into an 8-Ω load is 1.15 W. This class-D amplifier is designed to have a broad operational range of 2.7-4.9 V for the direct use of mobile phone battery power. It has a total area of 1.01 mm<SUP>2</SUP> and achieves a THD+N of 0.018%.</P>
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