Shown is a cascaded amplifier circuit to deliver power to a 400-ohm load from a 100mV peak AC sourcewith an impedance of 50 ohms. ß = 175, VÀ has infinite value, V₁ = 26mV. Assume that the BJTs haveVBE = 0.7V and VCESAT = 0.2V.VsSource50 22Common Emitter Amplifier8.6 ΚΩ900 Ω+14V500 ΩQ₁40 029 ΚΩ11.3 ΚΩEmitter FollowerQ₂2.8 ΚΩLoadVout400 £2(a) Assuming that all capacitors → ∞, draw the small signal equivalent circuit of the emitterfollower.(b) Solve for the small signal parameters, gm and rn, of transistor Q2.(c) For the emitter follower, derive and solve the values of its two-port parameters (Gm, Av, Ro, andR₁). To aid you, assume that rn >>1 and ß >> 1.

According to the question, for the given cascade amplifier circuit as shown below We need to find

Shown is a cascaded amplifier circuit to deliver power to a 400-ohm load from a 100mV peak AC source with an impedance of 50 ohms. ß= 175, VA has infinite value, VT = 26mV. Assume that the BJTs have VBE = 0.7V and VCESAT = 0.2V.

Shown is a cascaded amplifier circuit to deliver power to a 400-ohm load from a 100mV peak AC source with an impedance of 50 ohms. ß= 175, VA has infinite value, VT = 26mV. Assume that the BJTs have VBE = 0.7V and VCESAT = 0.2V.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Concept explainers

Differential amplifier

There are two amplifying stages with common degeneration in a differential amplifier.

Question

Shown is a cascaded amplifier circuit to deliver power to a 400-ohm load from a 100mV peak AC source
with an impedance of 50 ohms. ß = 175, VÀ has infinite value, V₁ = 26mV. Assume that the BJTs have
VBE = 0.7V and VCESAT = 0.2V.
Vs
Source
50 22
Common Emitter Amplifier
8.6 ΚΩ
900 Ω
+14V
500 Ω
Q₁
40 02
9 ΚΩ
11.3 ΚΩ
Emitter Follower
Q₂
2.8 ΚΩ
Load
Vout
400 £2
(a) Assuming that all capacitors → ∞, draw the small signal equivalent circuit of the emitter
follower.
(b) Solve for the small signal parameters, gm and rn, of transistor Q2.
(c) For the emitter follower, derive and solve the values of its two-port parameters (Gm, Av, Ro, and
R₁). To aid you, assume that rn >>1 and ß >> 1.

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