Patent ID: 8212620

Claim:
An amplifier device, comprising: a BTL amplifier having an input for receiving an audio input signal and the BTL amplifier producing an output signal to a load; a boosted-rail circuit connected to a power source and having a boosted rail connected to the BTL amplifier, and the boosted-rail circuit supplying an output voltage to the BTL amplifier through the boosted rail in a non-boost mode and a boost mode; wherein the boosted-rail circuit reacts to the BTL amplifier and switches from the non-boost mode to the boost mode to increase the output voltage supplied to the BTL amplifier beyond the voltage of the power source when the BTL amplifier requires additional voltage; and a common-mode circuit in communication with the boosted-rail circuit and the BTL amplifier, the common-mode circuit sends a common-mode signal to the BTL amplifier that will dynamically track the output voltage supplied from the boosted-rail circuit to the BTL amplifier.