Embedded Single-Inductor Bipolar-Output DC–DC Converter in Class-D Amplifier for Low Common Noise

This paper proposes a high efficiency class-D amplifier (CDA) with embedded single-inductor bipolar output (SIBO) power module. The characteristics of SIBO converter's bipolar outputs not only suppress equivalent common-mode noise but also remove several large external bulky components in conventional boost supply CDA systems. Since bipolar outputs in the SIBO provide independent driving capability, CDA is capable of operating in both single-ended and bridge-tide load configurations. Furthermore, the proposed dynamic voltage boosting technique adjusts the SIBO output voltage level according to the CDA's output level with 5% power efficiency improvement. Peak total harmonic distortion plus noise performance is 0.012%. Peak power efficiency of SIBO and CDA is 89% and 93.2%, respectively.

[1]  Jianlong Chen,et al.  Integrated Pop-Click Noise Suppression, EMI Reduction, and Short-Circuit Detection for Class-D Audio Amplifiers , 2013, IEEE Journal of Solid-State Circuits.

[2]  Marco Berkhout,et al.  A 3.4 W Digital-In Class-D Audio Amplifier in 0.14 $\mu $m CMOS , 2012, IEEE Journal of Solid-State Circuits.

[3]  Marco Berkhout,et al.  Class-D Audio Amplifiers in Mobile Applications , 2010, IEEE Transactions on Circuits and Systems I: Regular Papers.

[4]  Ke-Horng Chen,et al.  A Class-D amplifier powered by embedded single-inductor bipolar-output power module with low common noise and dynamic voltage boosting technique , 2014, ESSCIRC 2014 - 40th European Solid State Circuits Conference (ESSCIRC).

[5]  Ke-Horng Chen,et al.  P‐56: A Single‐Inductor Bipolar‐Output DC/DC Converter with High Efficiency Over Wide Load Range for Active Matrix OLED , 2014 .

[6]  Chun Kit Lam,et al.  Class-D Amplifier Power Stage With PWM Feedback Loop , 2013, IEEE Transactions on Power Electronics.

[7]  M. Berkhout,et al.  An integrated 200W class D audio amplifier , 2003, Proceedings of the 28th European Solid-State Circuits Conference.

[8]  Edgar Sánchez-Sinencio,et al.  A Feed-Forward Power-Supply Noise Cancellation Technique for Single-Ended Class-D Audio Amplifiers , 2014, IEEE Journal of Solid-State Circuits.

[9]  Marco Berkhout,et al.  A 4Ω 2.3W class-D audio amplifier with embedded DC-DC boost converter, current-sensing ADC and DSP for adaptive speaker protection , 2013, 2013 IEEE International Solid-State Circuits Conference Digest of Technical Papers.

[10]  Angelo Nagari,et al.  An 8 $\Omega$ 2.5 W 1%-THD 104 dB(A)-Dynamic-Range Class-D Audio Amplifier With Ultra-Low EMI System and Current Sensing for Speaker Protection , 2012, IEEE Journal of Solid-State Circuits.

[11]  Edgar Sanchez-Sinencio,et al.  A High-Efficiency Self-Oscillating Class-D Amplifier for Piezoelectric Speakers , 2015, IEEE Transactions on Power Electronics.

[12]  F. Koeslag,et al.  Analytical Modeling of the Effect of Nonlinear Switching Transition Curves on Harmonic Distortion in Class D Audio Amplifiers , 2013, IEEE Transactions on Power Electronics.

[13]  Nacer Abouchi,et al.  A high PSRR Class-D audio amplifier IC based on a self-adjusting voltage reference , 2010, 2010 Proceedings of ESSCIRC.

[14]  Kuo-Hsin Chen,et al.  A High-PSRR Reconfigurable Class-AB/D Audio Amplifier Driving a Hands-Free/Receiver 2-in-1 Loudspeaker , 2012, IEEE Journal of Solid-State Circuits.

[15]  Ke-Horng Chen,et al.  A near-zero cross-regulation single-inductor bipolar-output (SIBO) converter with an active-energy-correlation control for driving cholesteric-LCD , 2011, 2011 IEEE Custom Integrated Circuits Conference (CICC).

[16]  Tong Ge,et al.  Intermodulation Distortions of Bang–Bang Control Class D Amplifiers , 2014, IEEE Transactions on Power Electronics.

[17]  Hiroo Sekiya,et al.  Steady-State Analysis and Design of Class-D ZVS Inverter at Any Duty Ratio , 2016, IEEE Transactions on Power Electronics.

[18]  Jun Yu,et al.  A Second-Order Class-D Audio Amplifier , 2011, SIAM J. Appl. Math..