A 2 W BTL single-chip class-D power amplifier with very high efficiency for audio applications

Lee, Dong Kun; Lee, Jae‐Shin; Lee, Gun-Sang; Kim, S.

doi:10.1109/iscas.2000.857479

Cited by 12 publications

(1 citation statement)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This chapter introduces the structure and working principles of conventional analog and digital Class D amplifiers followed by a review of various spread spectrum methods for switching-mode circuits. [15][16][17][18]. Hence, the BTL is a preferred topology compared to the half bridge in terms of performance.…”

Section: Literature Reviewmentioning

confidence: 99%

Class D amplifier with pseudo-randomized carrier frequency modulation (PRCFM) for EMI mitigation

Jin¹

View full text Add to dashboard Cite

Class D amplifiers are found in nearly all portable electronic products for their small size and power efficiency. Due to their high frequency switching operation, they generate significant amount of electromagnetic interference (EMI) and usually offchip filters are necessary in order for them to comply with the international regulatory EMI limits. With the continuous trend of product miniaturization, filterless Class D amplifiers are gaining attention recently. Without the off-chip filter, designing a fully integrated filter-less Class D amplifier to meet the EMI requirements can be challenging. This thesis develops and implements a pseudo-randomized carrier frequency modulation (PRCFM) technique in both analog and digital filterless Class D audio power amplifiers for EMI mitigation purposes so that these amplifiers fulfill the electromagnetic compatibility (EMC) requirement without the needs of off-chip filters. The PRCFM circuit is implemented with a frequency divider and a linear feedback shift register (LFSR). The proposed amplifier also features a peak detector to improve the power conversion efficiency when it operates under low audio input condition. An analog filter-less Class D amplifier is designed and fabricated using 0.18 µm CMOS process technology with a size of 1 mm 2 and the proposed PRCFM circuit occupies only less than 1% of the total chip area. The effectiveness of the PRCFM VCO Voltage Controlled Oscillator

show abstract

Section: Literature Reviewmentioning

confidence: 99%

Class D amplifier with pseudo-randomized carrier frequency modulation (PRCFM) for EMI mitigation

Jin¹

View full text Add to dashboard Cite

show abstract

Design of a broadband current mode class-D power amplifier with harmonic suppression

Khan

Qureshi

Zafar

et al. 2016

Analog Integr Circ Sig Process

View full text Add to dashboard Cite

A THD-reduction high-efficiency audio amplifier using inverter-based OTAs with filter-output feedback

Hwang¹,

Shen²,

Chen³

et al. 2014

Microelectronics Journal

View full text Add to dashboard Cite

A 2 W BTL single-chip class-D power amplifier with very high efficiency for audio applications

Cited by 12 publications

References 1 publication

Class D amplifier with pseudo-randomized carrier frequency modulation (PRCFM) for EMI mitigation

Class D amplifier with pseudo-randomized carrier frequency modulation (PRCFM) for EMI mitigation

Design of a broadband current mode class-D power amplifier with harmonic suppression

A THD-reduction high-efficiency audio amplifier using inverter-based OTAs with filter-output feedback

Contact Info

Product

Resources

About