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On the definition of the cutoff frequency fT

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1 Author(s)

The commonly used definition of cutoff frequency fTof bipola transistors is predicated on the existence of a frequency domain in which the magnitude of the current gain β varies inversely with frequency. In the absence of such a domain, the definition is vague. The definition 1/fT= d/df[lm (1/β)] for f →0 is proposed.

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Proceedings of the IEEE  (Volume:57 ,  Issue: 12 )