| 摘要 |
A communications interface circuit includes data signal transformers for transmitting and receiving interface data signals. Each data signal transformer has a split interface-side winding that faces the cable connecting the interface with other equipment. Imbalance detection transformers each have a tapped interface-side winding (e.g., center-tapped) connected in series between split portions of the split interface-side winding of a respective data signal transformer. A DC circuit (source or load) has positive and negative supply terminals each connected to a tap connection of the tapped winding of an imbalance detection transformer. Imbalance detection and correction circuitry detects imbalance by (a) applying a relatively low-frequency imbalance detection signal to the local-side winding of the imbalance detection transformers, and (b) applying a detection function to a resulting imbalance detection signal obtained from the respective imbalance detection transformer, and then applies a compensation current to the local-side windings of the data signal transformers based on the detected imbalance.
|
