Error correction system for a class-D power stage

Details Error correction system for a class-D power stage Error correction system for a class-D power stage

2007-12-21

2010-11-23

Choe, Henry K (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S251000

Reexamination Certificate

active

07839211

ABSTRACT:
The present invention relates to a method for correcting for a source of non-linearity and noise introduced in a switching power amplification stage during power amplification of a pulse-modulated reference signal from a pulse modulator, where the method comprises the following steps: —providing an output stage embedded in an analogue self-oscillating control loop able to receive a pulse-referenced input signal; —generating a feedback signal from the switching power amplification stage or after a demodulation filter; —deriving an error signal by comparing the feedback signal with the reference signal; —filtering the error signal by a low pass filter for reducing the higher harmonics of the carrier; —adding a compensator for generating high loop gain in the audio band; —feeding the compensator output to a zero cross detector or comparator, thus providing a carrier for re-modulation or re-timing by feeding the filtered signal to a zero cross detector or comparator, which controls the output stage. The invention furthermore relates to various systems for implementing the above method.

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