In the common-base circuit shown in Figure P7.70, the transistor parameters are: (beta=100, V_{B E}() on ()=0.7

Question:

In the common-base circuit shown in Figure P7.70, the transistor parameters are: \(\beta=100, V_{B E}(\) on \()=0.7 \mathrm{~V}, V_{A}=\infty, C_{\pi}=10 \mathrm{pF}\), and \(C_{\mu}=1 \mathrm{pF}\).

(a) Determine the upper \(3 \mathrm{~dB}\) frequencies corresponding to the input and output portions of the equivalent circuit.

(b) Calculate the small-signal midband voltage gain.

(c) If a load capacitor \(C_{L}=15 \mathrm{pF}\) is connected between the output and ground, determine if the upper \(3 \mathrm{~dB}\) frequency will be dominated by the \(C_{L}\) load capacitor or by the transistor characteristics.

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