Processes and systems for treating an aromatic feed comprising an aromatic component and nitrogen-containing impurities, as well as processes and systems for preparing a reaction product of an aromatic component from an aromatic feed comprising the aromatic component and nitrogen-containing impurities, are provided herein. According to one embodiment, a perpendicular recording magnetic head includes a read section and a write section. The invention is particularly suitable for field measurement of signal characteristics of data streams or continuous in-line monitoring of signal characteristics within transmitted data streams. The circuit also includes a second subcircuit that causes a second transistor that is coupled to the circuit’s output to turn on during a falling transition and then turn off.