A High-Efficiency Self-Oscillating Class-D Amplifier for Piezoelectric Speakers


The design tradeoffs of the class-D amplifier (CDA) for driving piezoelectric (PZ) speakers are presented, together with efficiency, linearity, and electromagnetic interference. An implementation is proposed to attain high efficiency within the CDA design for PZ speakers to extend battery life in mobile devices. A self-oscillating closed-loop design is used to obviate the need for a carrier signal generator to attain low power consumption. The use of stacked-cascode CMOS transistors at the H-bridge output stage provides low-input capacitance to allow high-switching frequency to enhance linearity with high efficiency. Moreover, the CDA monolithic implementation achieves eighteen VPP output voltage swing during a low-voltage CMOS technology without requiring expensive high-voltage semiconductor devices. The prototype experimental results achieved a minimum THD + N of 0.025%, and a maximum potency of ninety six%. Compared to available CDA for PZ speakers, the proposed CDA achieved higher linearity, lower power consumption, and better efficiency.

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