TY - JOUR
T1 - A 28-W, -102.2-dB THD+N Class-D Amplifier Using a Hybrid ΔΣM-PWM Scheme
AU - Karmakar, Shoubhik
AU - Zhang, Huajun
AU - van Veldhoven, Robert
AU - Breems, Lucien J.
AU - Berkhout, Marco
AU - Fan, Qinwen
AU - Makinwa, Kofi A.A.
N1 - Accepted author manuscript
PY - 2020
Y1 - 2020
N2 - This article presents a 28-W class-D amplifier for automotive applications. The combination of a high switching frequency and a hybrid multibit Δ Σ M-PWM scheme results in high linearity over a wide range of output power, as well as low AM-band EMI. As a result, only a small (150-kHz cutoff frequency), and thus low-cost, LC filter is needed to meet the CISPR-25 EMI average limit (150 kHz-30 MHz) with 10-dB margin. At 28-W output power, the proposed amplifier achieves 91% efficiency while driving a 4- Ω load from a 14.4-V supply. It attains a peak THD+N of 0.00077% (-102.2 dB) for a 1-kHz input signal.
AB - This article presents a 28-W class-D amplifier for automotive applications. The combination of a high switching frequency and a hybrid multibit Δ Σ M-PWM scheme results in high linearity over a wide range of output power, as well as low AM-band EMI. As a result, only a small (150-kHz cutoff frequency), and thus low-cost, LC filter is needed to meet the CISPR-25 EMI average limit (150 kHz-30 MHz) with 10-dB margin. At 28-W output power, the proposed amplifier achieves 91% efficiency while driving a 4- Ω load from a 14.4-V supply. It attains a peak THD+N of 0.00077% (-102.2 dB) for a 1-kHz input signal.
KW - audio power amplifier
KW - class-D amplifier
KW - electro-magnetic interference (EMI)
KW - hybrid
KW - pulsewidth modulation (PWM)
KW - ΔΣM
UR - http://www.scopus.com/inward/record.url?scp=85097228098&partnerID=8YFLogxK
U2 - 10.1109/JSSC.2020.3023874
DO - 10.1109/JSSC.2020.3023874
M3 - Article
AN - SCOPUS:85097228098
VL - 55
SP - 3146
EP - 3156
JO - IEEE Journal of Solid State Circuits
JF - IEEE Journal of Solid State Circuits
SN - 0018-9200
IS - 12
M1 - 9207737
ER -