Filterless class-D speaker driver with less switching

Details Filterless class-D speaker driver with less switching Filterless class-D speaker driver with less switching

2007-04-30

2009-10-27

Shingleton, Michael B (Department: 2815)

Amplifiers

Modulator-demodulator-type amplifier

C330S251000, C330S20700P, C330S146000

Reexamination Certificate

active

07609110

ABSTRACT:
Methods for designing a filterless class-D amplifier and driver are described herein. In the exemplary embodiment, a feedback loop is used to stabilize the filterless class-D amplifier. A pulse width modulated (PWM) output signal is generated by adding a comparator input signal to a comparative signal, and comparing the sum to a peak voltage, which can be a peak value of the comparative signal. A limit of one PWM sample will be generated half per period of the comparative signal, resulting in lower dynamic switching noise and a decreased sensitivity to jitter noise than conventional filterless class-D amplifiers.

REFERENCES:
patent: 7388426 (2008-06-01), Chang et al.
S.R. Norsworthy, R. Schier, G.C. Temes, “Delta-Sigma Data Converters: Theory, Design, and Simulations”, Chapter 5, IEEE Press, New York, 1997.
“1.4-W Mono Filterless Class-D Audio Power Amplifier”, Texas Instruments TPA2005D1 Data Sheet, Nov. 2004.
“500mW, Low EMI, Filterless, Class-D Audio Amplifier”, Maxim MAX9712 Data Sheet, Jan. 2004.
“1.3W, Filterless, Stereo Class-D Audio Power Amplifier”, Maxim MAX9701 Data Sheet, Sep. 2005.

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