For the cascode circuit in Figure 7.65 in the text, circuit parameters are the same as described in Example 7.15. The transistor parameters are: \(\beta_{o}=120, V_{A}=\infty, V_{B E}(\mathrm{on})=0.7 \mathrm{~V}, C_{\pi}=12 \mathrm{pF}\), and \(C_{\mu}=2 \mathrm{pF}\).

(a) If \(C_{L}\) is an open circuit, determine the \(3 \mathrm{~dB}\) frequencies corresponding to the input and output portions of the equivalent circuit.

(b) Determine the midband voltage gain.

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

Data From Example 7.15:-

Transcribed Image Text:

Determine the 3 dB frequencies and midband gain of a cascode circuit. = For the circuit in Figure 7.65, the parameters are: V+ = 10 V, V = -10 V, Rs = 0.1 ks, R = 42.5 ks2, R2 = 20.5 ks2, R3 = 28.3 KS, RE = 5.4 kQ, Rc 5 KS, RL = 10 k2, and CL= 0. The transistor parameters are: = 150, VBE(on) = 0.7 V, VA = , C = 35 pF, and C = 4 pF. =