Electrical Engineering: Principles & Applications (7th Edition)
7th Edition
ISBN: 9780134484143
Author: Allan R. Hambley
Publisher: PEARSON
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Textbook Question
Chapter 11, Problem 11.26P
In an amplifier circuit, why do we need to bas the MOSFET at an operating point? What would happen if the signal peak amplitude was smaller than 1V, the transistor had
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VcC
R2
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RL
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Assume: B=100, VA=150, Vcc=12V, VɛE=GND,
R=2K, R1=160K, R2=300K, Rɛ=3K, Rc=2.2K, and R1=100K.
A.)For the circuit draw the AC equivalent circuit (including the small signal
model for the transistor). Then compute r„, ľo, and gm. Then compute
Av (the gain for the entire circuit), and Rin (for the whole circuit).
B.)Convert the circuit to a common-collector circuit. Draw the new circuit
(assume the same values for the input and load resistances). Then compute
the terminal voltage gain, and Rin (for the whole circuit), re-computing any
parameters that you need to solve.
Amplifier circuit is show below has a single ac input and one ac output. Assuming 2N2222 transistor:
Construct the T-model of the transistor with all parameters labelled and evaluated. Assume room temperature.
Draw a complete small signal circuit model, then find the voltage gain. Explain two characteristics of this amplifier.
Calculate the current gain, the input resistance, and the output resistance.
The amplifier in the circuit below is driven by a signal generator v, with a small sine wave signal
vhose average value is zero. Assume the transistor has a value of B-100, and V-26 mV.
a. You need to design the circuit so that the de emitter current IE
of the emitter resistor RE to establish the desired de emitter current.
= 1 mA. Specify the value
b.
A de collector voltage of +5 volts is desired. Specify the value of the collector resistor Re
to establish the desired de collector voltage.
For this part assume that RL 5 K and the Early Effect needs to be considered. The
transistor has a VA 100 Volts. Draw the ac small signal equivalent circuit model of the
amplifier and determine its voltage gain.
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Chapter 11 Solutions
Electrical Engineering: Principles & Applications (7th Edition)
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- A Bipolar junction Transistor with curreat amplification factor being 100, Input Base current is 50μA. Collector voltage is 10 V and biasing voltage being +20 V. Find followings a. Collector current b. Resistance (R1) c. Collector voltage , Emitter voltage , Base Voltage & Collector-Emitter Voltage.arrow_forward1 The AC input to a common emitter amplifier (Figure 1) is such that it is comparable to thermal voltage VT. For such an amplifier: a. Please show how a hybrid – T small-signal model would look like. Do not ignore early effect. b. Please derive relation for the terminal voltage gain and overall voltage gain. Vcc Rc R RE C Figure 1 You uolont oirouitarrow_forwardFill in the table VB VC VE Ic LE I8 fre IT gm 5V Consider the circuit given at the right. 600k 1.5k =0.7, Vauo, B=165) 100uF Vo 1k 100uF a) Perform DC analysis and calculate all VB =? VC:? branch currents, node voltages, and small signal parameters 3K VE=? Rout b) Draw a small-signal equivalent model n Vin Rin 400K c) Calculate Ri, Rout, and Ay=Vou/Vin -5Varrow_forward
- In the circuit given in the figure, Vcc = 15 V, R1 = R2 = 10kΩ, RE = 1KΩ, RL = 0.5kΩ and transistor parameters are given as VBE = 0.7V, ßdc = ß0 = 100. a. Calculate the values of DC bias currents and voltages (IBQ, ICQ and VCEQ). b. Draw the small signal equivalent circuit of the circuit using the hybrid model of the transistor. c. Derive the input impedance expression of the circuit and calculate its value. d. Derive the AVI and AVG voltage gain expressions and calculate their values. e. Derive the current gain expression AI = I0 / Ii and calculate its value. Compare this value you have calculated with the value you will calculate using the expression Aİ = Zi AVI / RL.arrow_forwardDraw, Illustrate and label your schematic diagram before solving the problem. 3) Given an Emitter-Stabilize Biased transistor circuit with beta DC is 250,Base resistor is 150 ohms, collector resistor is 1.5k ohms ,emitter resistor is 500 ohms ,emitter voltage supply is -5v and Voltage at common collector is +28V,Voltage at Base-emitter junction is 0.7v,. Determine Base current, Collector current and Voltage at collector-emitter junction.arrow_forwardAmplifier circuit is show below has a single ac input and one ac output. Assuming 2N2222 transistor: 1- Determine the Q point, then illustrate it on the transistor I-V characteristic curves. 2- Is the transistor in the active region? Explain thoroughly. 3- Construct the T-model of the transistor with all parameters labelled and evaluated. Assume room temperature. 4- Draw a complete small signal circuit model, then find the voltage gain. Explain two characteristics of this amplifier. 5- Calculate the current gain, the input resistance, and the output resistance.arrow_forward
- 4 For the transistor shown in below figure, Calculate the value of R, that will just make the transistor work as closed switch. Hence Bpc= 80, VBE = 0.7V, VCE(sat) = 0.2V, Vcc= 12V, Rc= 2.7KN. la) Calculate the In and I.. Vcc RB Rc |b) Calculate Rp- B'arrow_forwardConsider the circuit in Figure 2. The transistor has a parameter B that varies between 50 and 200. You want to know the operation of the circuit and the electrical variables at the end points. Calculate the following for B= 50 and B= 200. a) IE, VE and VB (Analysis in DC). b) The input resistance R." (Small signal analysis). c) The voltage gain VO/Vsing (Small signal analy). This 10 ΚΩ www o Rin 100 ΚΩ +3V +1₁ HH 1 ΚΩ 1₁ 1 ΚΩarrow_forwardQ1. (a) Consider the amplifier circuit in Figure Q1(a). Given the following: RI = 100 k2 R2 = 56 kN Rc =2 k2 Vcc = +8 V Assume the transistor has B = 100 and VBE(on) = 0.7 V. You may neglect Early effect and use VT = 26 mV. (i) Draw the DC equivalent circuit, then determine Iç and VCE. Draw the AC equivalent circuit using re model. Based on this, determine the parameters Av, Rin and Rout. (ii) Vcc Rc R1 R2 C3 Vout C2 Ci Vin Figure Q1(a)arrow_forward
- Question 2 Referring to Figure 2 and the following BJT parameters: B = 100, thermal voltage = 25 mV and VeE = 0.7 V. If v = (Mx10°)sin(wt) V where M is , 209384 . calculate the instantaneous positive peak collector voltage, Ve(peak). Explain the effect of CE on the BJT DC operating point and the small- signal voltage gain. Vcc 10V Rc $4.7 kN R 47 ko3 HE vo B-100 Vehermar=25mv R. 10 kn R $ika T10UF GND Figure 2arrow_forwardActivity 2: The amplifier circuit below has a single ac input and two ac outputs. Assuming transistor parameters of B= 130 and VBE=0.7 V: 15 V 15 V W 350 ΚΩ 300 ΚΩ H11 13 ΚΩ 10 ΚΩarrow_forward4. A Darlington transistor is essentially an array of two transistors connected as shown below. Assume both transistors follow our simple model with a current gain of B=100. Determine the maximum value of R2 that will just saturate the transistors, and pass full current through the load resistance R1. v2 V2 R2 PULSE (0 5 0) Q2 NPN R1 10 Q1 NPN V1 24arrow_forward
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How a MOSFET Works - with animation! | Intermediate Electronics; Author: CircuitBread;https://www.youtube.com/watch?v=Bfvyj88Hs_o;License: Standard Youtube License