Title :
New high-efficiency 2.5 V/0.45 W RWDM class-D audio amplifier for portable consumer electronics
Author :
Li, Simon Cimin ; Lin, Vincent Chia-Chang ; Nandhasri, Krissanapong ; Ngarmnil, Jitkasame
Author_Institution :
ATIS Lab., Nat. Yunlin Univ. of Sci. & Technol., Taiwan
Abstract :
A single-chip of Class-D audio amplifier with high-power efficiency is presented. It includes a rectangular wave delta modulator (RWDM) and bridge-tied load output gate-drivers. The RWDM has a multiple inputs floating-gate hysteresis comparator and a feedback integrator formed by the external L-R low-pass filter. This monolithic Class-D audio amplifier with a maximum power efficiency of 92% has a flat frequency response with ±0.3 dB up to 20 kHz, and is capable of delivering up to 0.45 W of continuous average power into an 8-Ω load at less than 0.5% total harmonic distortion plus noise from a 2.5-V power supply in the high fidelity range (20 Hz-20 kHz).
Keywords :
analogue integrated circuits; audio-frequency amplifiers; comparators (circuits); delta modulation; low-pass filters; monolithic integrated circuits; 0.45 W; 2.5 V; 92 percent; RWDM class-D audio amplifier; analog integrated circuits; continuous average power; feedback integrator; harmonic distortion; hysteresis comparator; load output gate-drivers; low-pass filter; portable consumer electronics; rectangular wave delta modulator; Consumer electronics; Delta modulation; Feedback; Frequency response; High power amplifiers; Hysteresis; Low pass filters; Power harmonic filters; Power supplies; Total harmonic distortion; Analog integrated circuits; Class D; audio amplifier; floating gate; power efficiency; rectangular wave delta modulator (RWDM);
Journal_Title :
Circuits and Systems I: Regular Papers, IEEE Transactions on
DOI :
10.1109/TCSI.2005.852500
