Abstract
A digital class-D audio amplifier is presented that is based on digital pulse-width modulation (PWM) and a com- bination of digital and analog feedback. Unlike other recent im- plementations for low-power applications this amplifier directly accepts digital input as the digital-to-analog conversion is an inherent feature of the presented topology.
The feedback topology uses a hybrid scheme with digital feedback to improve the performance of the PWM and analog- feedback to mitigate analog imperfections and to improve power supply rejection. Because of the proposed feedback scheme, the requirements on the analog-to-digital converter (ADC) in the feedback loop are greatly relaxed allowing the use of a continuous-time ∆Σ-modulator.
The class-D amplifier was realized in a standard 180nm CMOS technologies and drives 1.2W into an 8Ω load and achieves a total harmonic distortion plus noise (THD+N) of −96dB, a signal-to-noise ration (SNR) of 99.9dB having an efficiency of 91%.
The feedback topology uses a hybrid scheme with digital feedback to improve the performance of the PWM and analog- feedback to mitigate analog imperfections and to improve power supply rejection. Because of the proposed feedback scheme, the requirements on the analog-to-digital converter (ADC) in the feedback loop are greatly relaxed allowing the use of a continuous-time ∆Σ-modulator.
The class-D amplifier was realized in a standard 180nm CMOS technologies and drives 1.2W into an 8Ω load and achieves a total harmonic distortion plus noise (THD+N) of −96dB, a signal-to-noise ration (SNR) of 99.9dB having an efficiency of 91%.
Originalsprache | englisch |
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Titel | ESSCIRC 2019 - IEEE 45th European Solid State Circuits Conference (ESSCIRC) |
Herausgeber (Verlag) | Institute of Electrical and Electronics Engineers |
Seiten | 153-156 |
Seitenumfang | 4 |
ISBN (elektronisch) | 978-1-7281-1550-4 |
DOIs | |
Publikationsstatus | Veröffentlicht - Nov. 2019 |
Veranstaltung | 49th European Solid-State Circuits Conference: ESSCIRC 2019 - Dauer: 23 Sept. 2019 → 26 Sept. 2019 https://esscirc-essderc2019.org/ |
Konferenz
Konferenz | 49th European Solid-State Circuits Conference |
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Kurztitel | ESSCIRC |
Zeitraum | 23/09/19 → 26/09/19 |
Internetadresse |