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New high-efficiency 2.5 V/0.45 W RWDM class-D audio amplifier for portable consumer electronics

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4 Author(s)
Li, S.C. ; ATIS Lab., Nat. Yunlin Univ. of Sci. & Technol., Taiwan ; Lin, V.C.-C. ; Nandhasri, K. ; Ngarmnil, Jitkasame

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).

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Circuits and Systems I: Regular Papers, IEEE Transactions on  (Volume:52 ,  Issue: 9 )