Characterization of EMI-reducing spread-spectrum techniques for class-D audio amplifiers

Karaca, Timucin; Auer, Mario

doi:10.1109/apemc.2016.7522868

Cited by 3 publications

(1 citation statement)

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“…The variable frequency reference generator can be implemented having either a pseudo-random frequency pattern, or a periodic frequency pattern. Our previous works [16] have revealed that periodic frequency modulation generally leads to better emission reduction for the same frequency deviation f . In such periodic SSM implementations, the reference triangle signal is frequency modulated by ± f using a periodic modulation signal of frequency f m .…”

Section: Pulse Width Modulators and Spread-spectrum Modulationmentioning

confidence: 99%

Digital pulse-width modulator with spread-spectrum emission reduction

Karaca

Auer

2018

Elektrotech. Inftech.

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Pulse-width modulated power-stages are used in many power-electronic applications because of their high efficiency. They are known to be a root cause for electromagnetic emission problems if no countermeasures are taken. This work presents a digital pulse-width modulator with an emission reduction method based on spread-spectrum modulation techniques. The proposed method is analyzed in detail, and two possible digital implementations are discussed. The implementations are compared in terms of chip-area and power consumption. Finally, an application of the proposed digital pulse-width modulator in a digitally-controlled Class-D audio amplifier is presented to show the feasibility of the concept. Using an FPGA prototype, a measured emission reduction of up to 9.5 dB is achieved.Keywords: pulse-width modulator; spread-spectrum modulation; electromagnetic emission; Class-D amplifier Digitaler Pulsweitenmodulator mit Spread-Spectrum-Emissionsreduktion. Pulsweitenmodulierte Leistungsstufen werden aufgrund ihres hohen Wirkungsgrades in vielen leistungselektronischen

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Section: Pulse Width Modulators and Spread-spectrum Modulationmentioning

confidence: 99%