Homework Help is Here – Start Your Trial Now!
Engineering
Electrical Engineering
1. Figure Q1 shows a two-stage BJT amplifier where the transistors Q and Q₂ are matched with the forward current gain, ß = 125. The resistances are given as Rs = 100 Q, R₁ = R₂ = 1 MQ, Rc1 = 10 kN, RE1 = 1 kN, R3 = 100 kn, R4 = 22 kn, Rc2 = 1 kQ, RE2 = 100 S2, while the external capacitances are given as C₁ = C₂ = 10 μF and CE1 = CE2 = 40 uF. Assume that the internal resistances rb0, ruco and ro = 50 kn. Vs Rs R₁ Rc1 REI C₂ HF Figure Q1 R3 R₁ Rc2 RE2 Vcc 22 Vo a) The circuit has DC bias currents of Ici = 5.3 mA and Ic2 = 14.6 mA. Compute the hybrid- л parameters, gm1, gm2, l'al and ra2 for the transistors. b) Sketch the small-signal equivalent circuit in a form suitable for low-frequency AC analysis. c) Apply short-circuit time constant method to find the equivalent resistance seen by each of the external capacitor. d) Compute the lower 3-dB frequency (fi) of the amplifier.

1. Figure Q1 shows a two-stage BJT amplifier where the transistors Q and Q₂ are matched with the forward current gain, ß = 125. The resistances are given as Rs = 100 Q, R₁ = R₂ = 1 MQ, Rc1 = 10 kN, RE1 = 1 kN, R3 = 100 kn, R4 = 22 kn, Rc2 = 1 kQ, RE2 = 100 S2, while the external capacitances are given as C₁ = C₂ = 10 μF and CE1 = CE2 = 40 uF. Assume that the internal resistances rb0, ruco and ro = 50 kn. Vs Rs R₁ Rc1 REI C₂ HF Figure Q1 R3 R₁ Rc2 RE2 Vcc 22 Vo a) The circuit has DC bias currents of Ici = 5.3 mA and Ic2 = 14.6 mA. Compute the hybrid- л parameters, gm1, gm2, l'al and ra2 for the transistors. b) Sketch the small-signal equivalent circuit in a form suitable for low-frequency AC analysis. c) Apply short-circuit time constant method to find 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
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
See similar textbooks
icon
Related questions
icon
Concept explainers
Question
1. Figure Q1 shows a two-stage BJT amplifier where the transistors Q and Q₂ are matched with the forward current gain, ß = 125. The resistances are given as Rs = 100 Q, R₁ = R₂ = 1 MQ, Rc1 = 10 kn, RE1 = 1 KQ, R3 = 100 kN, R4 = 22 kn, Rc2 = 1 kQ, RE2 = 100 92, while the external capacitances are given as C₁ = C₂ = 10 μF and CE1 = CE2 = 40 uF. Assume that the internal resistances rь= 0, ₁ = ∞ and ro = 50 kn. Vs Rs R₁ Rc1 REI C₂ HF Figure Q1 R3 R₁ Rc2 RE2 Vcc 22 Vo a) The circuit has DC bias currents of Ici = 5.3 mA and Ic2 = 14.6 mA. Compute the hybrid- л parameters, gm1, gm2, l'al and ra2 for the transistors. b) Sketch the small-signal equivalent circuit in a form suitable for low-frequency AC analysis. c) Apply short-circuit time constant method to find the equivalent resistance seen by each of the external capacitor. d) Compute the lower 3-dB frequency (ft) of the amplifier.
Transcribed Image Text:1. Figure Q1 shows a two-stage BJT amplifier where the transistors Q and Q₂ are matched with the forward current gain, ß = 125. The resistances are given as Rs = 100 Q, R₁ = R₂ = 1 MQ, Rc1 = 10 kn, RE1 = 1 KQ, R3 = 100 kN, R4 = 22 kn, Rc2 = 1 kQ, RE2 = 100 92, while the external capacitances are given as C₁ = C₂ = 10 μF and CE1 = CE2 = 40 uF. Assume that the internal resistances rь= 0, ₁ = ∞ and ro = 50 kn. Vs Rs R₁ Rc1 REI C₂ HF Figure Q1 R3 R₁ Rc2 RE2 Vcc 22 Vo a) The circuit has DC bias currents of Ici = 5.3 mA and Ic2 = 14.6 mA. Compute the hybrid- л parameters, gm1, gm2, l'al and ra2 for the transistors. b) Sketch the small-signal equivalent circuit in a form suitable for low-frequency AC analysis. c) Apply short-circuit time constant method to find the equivalent resistance seen by each of the external capacitor. d) Compute the lower 3-dB frequency (ft) of the amplifier.
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 7 steps with 6 images

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Knowledge Booster
Power amplifier
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
Electrical Engineering
ISBN:
9780133923605
Author:
Robert L. Boylestad
Publisher:
PEARSON
Delmar's Standard Textbook Of Electricity
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:
9781337900348
Author:
Stephen L. Herman
Publisher:
Cengage Learning
Programmable Logic Controllers
Programmable Logic Controllers
Electrical Engineering
ISBN:
9780073373843
Author:
Frank D. Petruzella
Publisher:
McGraw-Hill Education
Fundamentals of Electric Circuits
Fundamentals of Electric Circuits
Electrical Engineering
ISBN:
9780078028229
Author:
Charles K Alexander, Matthew Sadiku
Publisher:
McGraw-Hill Education
Electric Circuits. (11th Edition)
Electric Circuits. (11th Edition)
Electrical Engineering
ISBN:
9780134746968
Author:
James W. Nilsson, Susan Riedel
Publisher:
PEARSON
Engineering Electromagnetics
Engineering Electromagnetics
Electrical Engineering
ISBN:
9780078028151
Author:
Hayt, William H. (william Hart), Jr, BUCK, John A.
Publisher:
Mcgraw-hill Education,
SEE MORE TEXTBOOKS