Patent ID: 8330539

Claim:
A dual bridge dynamically switched mode amplifier comprising: a control circuit that detects a first amplitude of a first given input signal and a second amplitude of a second given input signal and that generates a mode switch signal based on the first and the second input signals; a first bridge amplifier having a first differential amplifier having a first pair of differential inputs and a first output and a second differential amplifier having a second pair of differential inputs and a second output, and a first resistor feedback network having a first common node connected through a first resistor to a differential input of the first differential amplifier and connected through a second resistor to a differential input of the second differential amplifier; a second bridge amplifier having a third differential amplifier having a third pair of differential inputs and an output and a fourth differential amplifier having a fourth pair of differential inputs and an output, and a second resistor feedback network having a second common node connected through a third resistor to a differential input of the third differential amplifier and connected through a fourth resistor to a differential input of the fourth differential amplifier; a first common node current compensator connected to the first common node to source or sink a first node compensation current based on one of the first and second input signals; a second common node current compensator connected to the second common node to source or sink a second node compensation current based on the other of the first and second input signals; a mode switch that switches, based on the mode switch signal, between a closed position connecting an output of the second differential amplifier to an output of the fourth differential amplifier of the second bridge amplifier, and an open position that terminates the connection; and a buffer compensator connected to the second differential amplifier and to the fourth differential amplifier that equalizes a magnitude and direction of current flow to and from respective outputs of said second and fourth differential amplifiers.