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A 3-W audio class-D amplifier compatible with AM/FM radio while requiring minimal external filtering is presented. The amplifier uses driver slew rate control to reduce electromagnetic interference (EMI) in the FM band and digital modulation to spread the PWM common-mode signal and place a null at the tuned AM channel. Two original feedback techniques are employed to linearize the H-bridge. One cancels...
Signal dependent propagation delay and supply modulation are among the major sources of performance deterioration in class D amplifiers. More so in the case where the control of the common-mode EMI of a Class D amplifier utilizes DSP-based signal spreading techniques and requires the switching amplifier to be “linear” to avoid folding the high frequency spectrum into the audio band. This paper reviews...
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