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 , . In , 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 currents, the series resistor can be replaced by a second inductor, at the expense of increased system complexity and cost .
|Title of host publication||2022 IEEE International Solid-State Circuits Conference, ISSCC 2022|
|Subtitle of host publication||Digest of technical papers|
|Editors||Laura C. Fujino|
|Place of Publication||Danvers|
|Number of pages||3|
|Publication status||Published - 2022|
|Event||2022 IEEE International Solid- State Circuits Conference (ISSCC) - Online at San Francisco, United States|
Duration: 20 Feb 2022 → 26 Feb 2022
|Name||Digest of Technical Papers - IEEE International Solid-State Circuits Conference|
|Conference||2022 IEEE International Solid- State Circuits Conference (ISSCC)|
|Abbreviated title||ISSCC 2022|
|City||Online at San Francisco|
|Period||20/02/22 → 26/02/22|
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