Abstract: An audio amplifier system includes at least a pair of DC power supplies, a floating bridge current gain output section, and a differential voltage gain input section that draws operating current from the DC power supplies through floating DC current regulators. The included current regulators reject power supply noise and modulation and provide a floating current path for establishing positive and negative operating voltages for the voltage gain section. Cross-coupled interstage loading enables nearly rail-to-rail output voltage swing while providing local feedback around the output section for reduced distortion and improved output load control. The floating current regulators in the circuit exhibit enhanced performance as a result of suppressed operating voltage fluctuations.

Abstract: A high fidelity audio amplifier is provided having a solid-state floating bridge output stage and a preceding solid-state driver stage configured to operate with negligible voltage fluctuations and minimal current fluctuations, resulting in reduced driver stage distortion, freedom from driver stage clipping, and high and linear impedance at the driver input terminals, without significant increase in circuit complexity. The voltage gain and current gain sections of the amplifier form self-contained units which may be separately housed and remotely operated to enhance utility and isolate sensitive voltage gain circuits from the radiated electrical noise and heat of the output stage.