| http://www.w3.org/ns/prov#value | - The circuits are used mostly for analog functions, e.g. for switching currents and voltages, and for high-frequency radio functions (mixers, amplifiers,detectors, etc.).The speed of today's silicon bipolar junction transistors (BJT) with about 50 GHz f.sub.T (maximum transition frequency) is reaching its physical limitations because of the trade-off between the thickness and the resistivity of the
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