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Figure Q1 shows a cascode BJT amplifier where the transistors Qi and Q2 are matched with the forward current gain, ß = 300. The resistances are given by Rs = 10 2, R1 = 2 k2, R2 = 1 kN, R3 = 1.6 k2, R4 = 600 Q and Rs = 1 k2, while the external capacitances are given by C/ = 1 µF, C2 = 100 µF and C3 = 470 µF. Assume that the internal resistances r, = 0 2 and r, = 0, r, = co and neglect base currents where appropriate. Vc R3 R, C; C, Rs R$ R2 Vs IEE Figure Q1 a) The circuit has DC bias currents of Ici = 25 µA and Ic2 = 4.6 mA. Compute the hybrid-n parameters, gml, gm2, ľ'zl and ra2 for the transistors. b) Draw the small-signal equivalent circuit in a form suitable for low-frequency AC analysis. c) Based on the circuit drawn in (b), calculate the equivalent resistance seen by each of the external capacitor. d) Compute the lower 3-dB frequency (fi) of the amplifier.

Figure Q1 shows a cascode BJT amplifier where the transistors Qi and Q2 are matched with the forward current gain, ß = 300. The resistances are given by Rs = 10 2, R1 = 2 k2, R2 = 1 kN, R3 = 1.6 k2, R4 = 600 Q and Rs = 1 k2, while the external capacitances are given by C/ = 1 µF, C2 = 100 µF and C3 = 470 µF. Assume that the internal resistances r, = 0 2 and r, = 0, r, = co and neglect base currents where appropriate. Vc R3 R, C; C, Rs R$ R2 Vs IEE Figure Q1 a) The circuit has DC bias currents of Ici = 25 µA and Ic2 = 4.6 mA. Compute the hybrid-n parameters, gml, gm2, ľ'zl and ra2 for the transistors. b) Draw the small-signal equivalent circuit in a form suitable for low-frequency AC analysis. c) Based on the circuit drawn in (b), calculate the equivalent resistance seen by each of the external capacitor. d) Compute the lower 3-dB frequency (fi) of the amplifier.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Figure Ql shows a cascode BJT amplifier where the transistors Qi and Q2 are matched with the forward current gain, ß = 300. The resistances are given by Rs = 10 Q, R1 = 2 kN, R2 = 1 kN, R3 = 1.6 k2, R4 = 600 2 and Rs = 1 kN, while the external capacitances are given by C1 = 1 µF, C2 = 100 µF and C3 = 470 µF. Assume that the internal resistances r, =0N and r, = 00, r, = ∞ and neglect base currents where appropriate. Vc C; C, Rs Q; Vs IEE RA Figure Q1 a) The circuit has DC bias currents of Icı = 25 µA and Ic2 = 4.6 mA. Compute the hybrid-r parameters, gml, gm2, ľzl and ra2 for the transistors. b) Draw the small-signal equivalent circuit in a form suitable for low-frequency AC analysis. c) Based on the circuit drawn in (b), calculate the equivalent resistance seen by each of the external capacitor. d) Compute the lower 3-dB frequency (fi) of the amplifier. www
Transcribed Image Text:Figure Ql shows a cascode BJT amplifier where the transistors Qi and Q2 are matched with the forward current gain, ß = 300. The resistances are given by Rs = 10 Q, R1 = 2 kN, R2 = 1 kN, R3 = 1.6 k2, R4 = 600 2 and Rs = 1 kN, while the external capacitances are given by C1 = 1 µF, C2 = 100 µF and C3 = 470 µF. Assume that the internal resistances r, =0N and r, = 00, r, = ∞ and neglect base currents where appropriate. Vc C; C, Rs Q; Vs IEE RA Figure Q1 a) The circuit has DC bias currents of Icı = 25 µA and Ic2 = 4.6 mA. Compute the hybrid-r parameters, gml, gm2, ľzl and ra2 for the transistors. b) Draw the small-signal equivalent circuit in a form suitable for low-frequency AC analysis. c) Based on the circuit drawn in (b), calculate the equivalent resistance seen by each of the external capacitor. d) Compute the lower 3-dB frequency (fi) of the amplifier. www
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