Bridge-output amplifier with direct-coupled differential-mode feedback

摘要

A bridge-output amplifier, comprising four transistor means connected in bridge responsive to a drive signal to supply opposite ends of a cross-arm load with push-pull output signals, has direct-coupled differential mode feedback to reduce the quiescent potential applied across the load. This feedback is provided by a difference amplifier having the push-pull output signals applied to respective ones of its inverting and non-inverting input circuits and supplying a feedback signal at its output circuit. This feedback signal is used to improve the balance of the bridge.