AMPLIFIER CIRCUITS AND METHODS TO PROVIDE SMOOTH TRANSITION OF AMPLIFIER OUTPUTS DURING POWERING SEQUENCES

摘要

The present invention is an apparatus and method to control an output from an amplifier circuit during a powering sequence. A current control circuit is coupled to the amplifier circuit to provide smooth transition at the output during the powering sequence, including the power-up interval and the power-down interval, during which the amplifier is muted. This results in the establishment and the decay of the amplifier mid-supply bias point during the power-up and power-down sequences, respectively, at rates that do not have significant frequency components in the audible range, eliminating the static-like click or pop on power-up and power-down, yet still providing short power-up and power-down times.