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IBM unveils nanotechnology circuits for wireless devices |
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IBM research scientists in a paper published in the magazine Science, have announced the first integrated circuit fabricated from wafer-size graphene and demonstrated a broadband frequency mixer operating at frequencies up to 10 gigahertz (10 billion cycles/second). Designed for wireless communications, the graphene-based analog integrated circuit has the potential to improve contemporary wireless devices and points to the potential for a new set of applications.  Graphene is the thinnest electronic material consisting of a single layer of carbon atoms packed in a honeycomb structure. It possesses outstanding electrical, optical, mechanical and thermal properties that could make it less expensive and use less energy inside portable electronics like smart phones.Applications At today's conventional frequencies, IBM said in a statement, cell phone and transceiver signals could be improved to the point where potentially phones could work where they presently cannot while, at much higher frequencies, military and medical personnel could see concealed weapons or conduct medical imaging without the same radiation dangers of X-rays. IBM said that challenges of integrating these graphene transistors with other components on a single chip had not been realized until now mostly because of poor adhesion of graphene with metals and oxides and the lack of reliable fabrication schemes to yield reproducible devices and circuits. The new integrated circuit, comprising a graphene transistor and a pair of inductors compactly integrated on a silicon carbide (SiC) wafer, overcomes these design hurdles by developing wafer-scale fabrication procedures that maintain the quality of graphene and, at the same time, allow for its integration to other components in a complex circuitry. IBM said the breakthrough is a major milestone for the Carbon Electronics for RF Applications (CERA) program, funded by DARPA. |
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