Techniques For Dealing With Common-mode Interference
Common mode noise may be isolated from the desired signal by various means:
- Common mode noise may be sensed and fed back negatively into object providing the signals (see Driven Right Leg).
- Both signal and signal return may be applied to the primary of a transformer, with the signal taken from the secondary. As common mode interference will not cause current to be induced in the primary, no signal from this source will be seen in the secondary, while differential signals on the primary will cause current in the primary and so cause induced voltage in the secondary.
- A signal transformer may have a center tapped primary to ground, with the signal and signal return operating as a balanced line (push-pull technique). This is advantageous; its resistance to signals raised on ground due to ground loop induction and ground circuit resistance.
- The signal (line and return) may be used to drive the LED in an opto-isolator.
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