Abstract: A feedback architecture for a PWM switching audio amplifier is, capable of compensating the effects of the demodulation filter through at least two feedback paths of the voltage applied to a load without degrading the overall loop gain of the device. Each of the feedback paths may include a respective network or filter for compensating a respective frequency pole of the cascade low-pass filter+load and establishing a certain band pass. These networks or filters may be passive networks.

Abstract: A selector switch may be controlled by a single-ended control signal for steering a current through a load or through an auxiliary line. The selector switch may include a first terminal to be coupled to the load, and a second terminal to be connected to the auxiliary line, and two analog switches coupled to respective ones of the first and second terminals and configured to implement a single pole double throw switch so that a conduction or non-conduction state is determined by the single-ended control signal for steering the current through the load or the auxiliary line. The selector switch may also include a circuit defining a positive feedback loop controlling the two analog switches.

Abstract: A boosting circuit supplied by a first voltage level and a second voltage level, and having an output line capable of taking a third voltage level, the circuit having at least two distinct circuits for generating the third voltage level, the at least two circuits selectively activatable for generating the third voltage level and selectively coupleable to the output line.