A 0.018% THD+N, 88-dB PSRR PWM Class-D Amplifier for Direct Battery Hookup
- Title
- A 0.018% THD+N, 88-dB PSRR PWM Class-D Amplifier for Direct Battery Hookup
- Author
- 노정진
- Keywords
- Class-D amplifier; power supply rejection ratio (PSRR); total harmonic distortion plus noise (THD plus N); efficiency, pulse-width modulation (PWM); delta-sigma (Delta Sigma) modulation
- Issue Date
- 2012-02
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Citation
- IEEE JOURNAL OF SOLID-STATE CIRCUITS, v. 47, NO. 2, Page. 454-463
- Abstract
- A low-distortion third-order class-D amplifier that is fully integrated into a 0.18-mu 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-feed forward delta-sigma (Delta Sigma) 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-Omega 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-Omega 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(2) and achieves a THD+N of 0.018%.
- URI
- https://ieeexplore.ieee.org/document/6070984https://repository.hanyang.ac.kr/handle/20.500.11754/183464
- ISSN
- 0018-9200;1558-173X
- DOI
- 10.1109/JSSC.2011.2170770
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > ELECTRICAL ENGINEERING(전자공학부) > Articles
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