Rf differential circuit with common mode noise rejection

A system, comprising:

• a differential amplifier circuit including a first amplifier stage and a second amplifier stage;
• a transformer connected between output terminals of the first amplifier stage and input terminals of the second amplifier stage, the transformer including a first winding having a first center tap and a second winding having a second center tap;
• a first bias terminal;
• a second bias terminal;
• a first rejection network connected between the first center tap and the first bias terminal;
• and
• a second rejection network connected to between the second center tap and the second bias terminal.

A method, comprising:

• receiving an RF differential input signal by a first RF differential circuit;
• outputting a first RF differential output signal from the first RF differential circuit to a primary winding of a transformer;
• filtering the first RF differential output signal by a first rejection network connected between a first center tap of the primary winding and a first bias signal and by a second rejection network connected between a second center tap of a secondary winding of the transformer and a second bias signal;
• receiving the first RF differential output signal from the secondary winding by a second RF differential circuit;
• and
• outputting a second RF differential output signal from the second RF differential circuit.