Output stage and method of enhancing output gain

An amplifier output stage configured to receive output from an input stage, the output stage comprising:

• an output circuit that provides an output of said amplifier output stage;
• a first current driving stage, coupled between an output of said input stage and said output circuit, configured to provide a first driving current to said output circuit;
• a first current compensation circuit, coupled between said input stage and said first current driving stage, configured to compensate for a first bias current present at said output of said input stage so as to minimize reflection current back into said input stage;
• a second current driving stage, coupled between an output of said input stage and said output circuit, configured to provide a second driving current to said output circuit;
• a second current compensation circuit, coupled between said input stage and said second current driving stage, configured to compensate for a second bias current present at said output of said input stage so as to minimize reflection current back into said input stage.

An amplifier output stage configured to receive an output from an amplifier input stage and to generate an output to a load, the amplifier output stage comprising:

• an output circuit from whence said output for a load is provided;
• a first current driving stage, coupled between said input stage and said output circuit, configured to generate a first driving current for said output circuit proportional to a first bias current based on said output from said amplifier input stage;
• said first current driving stage implemented with vertical PNP transistors and including a first current multiplier, coupled with said output circuit, configured to drive said output circuit at a predefined level while limiting magnitude of said first bias current;
• a second current driving stage, coupled between said input stage and said output circuit, configured to generate a second driving current for said output circuit proportional to a second bias current based on said output from said amplifier input stage;
• said second current driving stage including a second current multiplier, coupled with said output circuit, configured to drive said output circuit at a predefined level while limiting magnitude of said second bias current.

An amplifier output stage configured to receive output from an amplifier input stage and to generate an output to a load, the amplifier output stage comprising:

• a first current compensation circuit, coupled between said amplifier input stage and said amplifier output stage, configured to compensate for a first bias current to limit magnitude of reflect current back into said amplifier input stage;
• said first current compensation circuit including a current-sinking device coupled to sink a first total drive current to a load coupled to said amplifier output stage;
• a second current compensation circuit, coupled between said amplifier input stage and said amplifier output stage, configured to compensate for a second bias current to limit magnitude of reflect current back into said amplifier input stage;
• said second current compensation circuit including a current-sourcing device coupled to source a second total drive current to said load.

A method to enhance output gain of an amplifier output stage, the method comprising the following steps:

• receiving as a driving current an output from an amplifier input stage;
• multiplying magnitude of received said driving current;
• coupling multiplied said driving current as input to said output stage;
• and
• reducing reflection current into said output of said amplifier input stage proportional to magnitude of multiplication of received said driving current;
• wherein output of said amplifier output stage is stabilized.