(a) The frequency (f_{T}) of a bipolar transistor is found to be (540 mathrm{MHz}) when biased at...

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(a) The frequency \(f_{T}\) of a bipolar transistor is found to be \(540 \mathrm{MHz}\) when biased at \(I_{C Q}=0.2 \mathrm{~mA}\). The transistor parameters are \(C_{\mu}=0.4 \mathrm{pF}\) and \(\beta_{o}=120\). Determine \(f_{\beta}\) and \(C_{\pi}\).

(b) Using the results of part (a), determine \(f_{T}\) and \(f_{\beta}\) when the transistor is biased at \(I_{C Q}=0.8 \mathrm{~mA}\).

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