RF Noise Isolating Unit With Transformers For Signal Integrity

The patent introduces a noise isolating unit as an intermediary component between the antenna and the signal processing circuit. This unit includes a first transformer with primary and secondary windings, and a second transformer with primary and secondary windings. The first transformer couples the antenna to its primary winding, while the second transformer couples the first secondary winding to its primary winding. This multi-stage transformation isolates common-mode noise signals from the differential-mode signal transmission path, thereby improving signal-to-noise ratio without significantly complicating the overall device structure.

The noise isolating unit is segmented into multiple functional stages: the first transformer handles initial noise isolation from the antenna, while the second transformer provides additional isolation stage. Each transformer consists of primary and secondary windings that separately handle different aspects of noise filtering. This segmentation allows the system to achieve superior noise isolation performance through cumulative effect of multiple stages, while keeping each individual stage relatively simple and manageable.

The noise isolating unit extracts and removes common-mode noise signals from the signal path before amplification occurs. The first transformer isolates common-mode signals from the antenna input, and the second transformer further isolates any remaining common-mode signals. By taking out the harmful common-mode components early in the signal chain, the subsequent amplification process only amplifies the desired differential-mode signals, thereby achieving high gain without proportionally amplifying noise.