Arrangement for pulse-width modulating an input signal
AssigneeNXP B.V.
InventorsPetrus Antonius Cornelis Maria Nuijten, Lûtsen Ludgeras Albertus Hendrikus Dooper
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Abstract
An arrangement for pulse-width modulating an analog or digital input signal is provided. The non-linear distortion generated in the pulse-width modulator is precompensated by applying a signal with reversed error to the pulse-width modulator. The signal with reversed error is generated by a further pulse-width modulator that receives the input signal and whose output signal is subtracted from twice the input signal. The arrangement may e.g. be used to drive class D audio amplifiers.
Claims3
Arrangement for pulse-width modulating an input signal said arrangement comprising a pulse-width modulator and pre-compensation means connected in the input lead to the pulse-width modulator to pre-compensate for non-linear errors of said pulse-width modulator, characterized in that the pre-compensation means comprise a further pulse-width modulator that is substantially identical to the first mentioned pulse-width modulator and that is connected to receive the input signal, subtracting means for subtracting, for the baseband frequencies of the input signal, the output of the further pulse-width modulator from twice the input signal and means to supply the output of the subtracting means to the input of the first mentioned pulse-width modulator.
Dependencies are inferred from the claim text.