Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal, and applications thereof are described herein. Reducing or eliminating DC offset voltages and re-radiation generated when down-converting an electromagnetic (EM) signal is also described herein....http://www.google.com/patents/US6963734?utm_source=gb-gplus-sharePatent US6963734 - Differential frequency down-conversion using techniques of universal frequency translation technology
