Research Article
High-Fidelity and High-Efficiency Digital Class-D Audio Power Amplifier
Table 1
The comparison with literature.
| | Parameter | [17] | [31] | [32] | [33] | [34] | This work1 |
| | Process | 0.5 µm CMOS | 0.14 µm CMOS | 0.7 µm CMOS | 45 nm CMOS | 0.14 µm CMOS | 0.18 µm BCD | | Power supply (V) | 2.5 | 3.7, 5.0 | 5.0 | 4.8 | 3.7 | 3.6, 5.0 | | Modulator architecture | RWDM | ΔΣ + DPWM | HM | NBDDM | ΔΣ + DPWM | ΔΣ + UPWM | | Input type | Analog | Digital | Analog | Analog | Digital | Digital | | Output load (Ω) | 8 | 8 | 8 | 8 | 4 | 4 | | Efficiency (%) | 88∼92 | 92 | 84.5 | 90 | 90 | 93.3 | | THD + N (%) | 0.5 | 0.01 | 0.003 | 0.1 | 0.03 | 0.0138 | | Output power @ THD + N = 1% | — | 1 | 1.4 | — | 2.7 | 2.73 | | Area (mm2) | 0.59 | — | 6 | 0.54 | 1.59 | 1 |
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1Postlayout simulation results with transient noise. RWDM: rectangular wave delta modulator; HM: hysteretic modulator; NBDDM: natural sampled-BD-double-sided modulator.
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