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提出了一种无电阻的Class-D压电扬声器驱动器，采用双电压/电流反馈技术抑制LC谐振，实现了-91dB THD+N的高保真性能，同时提高了效率。
Goodix Technology, Nijmegen, The Netherlands 1 2 Piezoelectric speakers are gaining popularity on account of their improving form-factor and audio quality, making them a good fit for many audio applications such as in televisions, laptops, etc. Such speakers can be modelled as a large capacitive load, and so are typically driven by a Class-AB amplifier via a series resistor that ensures driver stability, and limits load current, but wastes power [1,2]. In [3], the Class-AB amplifier is replaced by a more power-efficient Class-D amplifier (CDA) in series with an additional inductor. However, a series resistor is still required to damp the resulting LC resonant circuit, which could otherwise draw excessive currents when excited by large-signal distortion (e.g. clipping) harmonics around the LC resonance frequency. Alternatively, by using a feed-forward architecture based on LC filter diagnostics to limit overshoot
Shoubhik Karmakar1, Marco Berkhout2, Kofi A. A. Makinwa1, Qinwen Fan1
Delft University of Technology, Delft, The Netherlands