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An Analysis of THD in Class D Amplifiers

An Analysis of THD in Class D Amplifiers. Huey Chian Foong; Meng Tong Tan; IEEE Asia Pacific Conference on Circuits and Systems, 2006. APCCAS 2006. Page(s):724 - 727.4-7 Dec. 2006 指導教授：易序忠 學 生：楊正元 國立彰化師範大學積體電路設計研究所. Outline. THD & PSRR Open-loop Class D amplifier

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An Analysis of THD in Class D Amplifiers

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  1. An Analysis of THD in Class D Amplifiers Huey Chian Foong; Meng Tong Tan; IEEE Asia Pacific Conference on Circuits and Systems, 2006. APCCAS 2006. Page(s):724 - 727.4-7 Dec. 2006 指導教授：易序忠 學 生：楊正元 國立彰化師範大學積體電路設計研究所

  2. Outline • THD & PSRR • Open-loop Class D amplifier • 2nd-order closed-loop Class D amplifier • Dual-loop Class D amplifier

  3. THD & PSRR • THD （Total Harmonic Distortion） （ ％ ） Lower is better ＜10％ • PSRR（Power Supply Rejection Rate） （dB） Higher is better

  4. Open-loop Class D amplifier

  5. 2nd-order closed-loop Class D amplifier

  6. A linear model of the 2nd-order closed-loop Class D amplifier

  7. Transfer function

  8. Parameter • GPWM is determined by the ratio of the power supply voltage over the amplifier of the carrier. • GPWM is less than 5 for a larger input dynamic range and signal-to-noise ratio.

  9. Parameter • H1 is approximately equal to –Rfb/R1. • H1 is the higher is the better. • The gain and bandwidth of the integrator has to be optimized to improve the PSRR and THD.

  10. Frequency respond of the 2nd-order integrator

  11. A dual-loop Class D amplifier based on 2nd-order integrator

  12. Dual-loop transfer function

  13. Loop-gain frequency response with dual loop feedback

  14. THD of a single-loop feedback Class D amplifier

  15. THD of a dual-loop feedback Class D amplifier

  16. The end.

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