Method and Apparatus for Maintaining DC Bias

摘要

A direct current (DC) bias maintenance circuit operably couples to the input of a primary amplifier. The DC bias maintenance circuit employs feedback to maintain the desired DC bias but lacks any coupling to the output of the primary amplifier. By one approach the DC bias maintenance circuit includes a secondary amplifier that replicates at least some near real-time performance characteristics of the primary amplifier. For example, the secondary amplifier can replicate at least certain DC properties of the primary amplifier such that DC-based changes appearing at the output of the primary amplifier are mirrored at an output of the secondary amplifier notwithstanding a lack of any coupling between the output of the primary amplifier and the DC bias maintenance circuit.

主权项

1. An apparatus comprising:
a primary amplifier having an input and an output; a direct current (DC) bias maintenance circuit operably coupled to the input of the primary amplifier, the DC bias maintenance circuit including a secondary amplifier that replicates at least some near real-time performance characteristics of the primary amplifier.