Repeat Problem 7.70 for the common-base circuit in Figure P7.71. Assume \(V_{E B}(\) on \()=0.7\) for the pnp transistor. The remaining transistor parameters are the same as given in Problem 7.70.

Figure P7.71:-

Data From Problem 7.70:-

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.

Transcribed Image Text:

Rs = 1 kQ CCI ww RE= 10 k2 Figure P7.71 + 20 V RC= 6.5 CC2 25 V RL= 15 +