


Because these SiGe circuits are performing analog processing of a high-frequency radio signal, the transistors that make up the circuits have to be able to switch at the same frequency as the radio signal that's passing through them. The faster these transistors can switch, the higher the frequencies they can be used to process. So a phone that operates in the 2GHz spectrum needs an analog RF chip that can operate at 2GHz; likewise, a radar device that operates in the 24GHz spectrum needs an analog processing circuit that can operate at 24GHz, and so on.
By making SiGe BiCMOS transistors that can operate at ever higher frequencies, IBM and others hope to enable the wireless industry to produce electronics that effectively utilize new portions of the radio spectrum.






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