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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1. For the circuit in Figure 1:
a) Calculate the input and output power if the input signal results in a base
current of 5 mA rms.
b) Calculate the input power dissipated by the circuit if RB is changed to
1.5 kN.
c) What maximum output power can be delivered by the circuit if RB is
changed to 1.5 kN?
d) If the circuit is biased at its center voltage and center collector operating
point, what is the input power for a maximum output power of 1.5 W?
+Vcc (18 V)
RC -16Ω
RB
1.2 k2
B - 40
100 µF
VcC
R2
RC-
RI
RL
R1
RE
VEE
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.
Chapter 11 Solutions
Electrical Engineering: Principles & Applications (7th Edition)
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- 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. 91SV C. 2.5k MM do RE -15 V 84 Vout RLarrow_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_forwardIn 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_forward
- Draw, 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_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_forwardA 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_forward
- Amplifier 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_forward4 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_forward
- Q1. (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_forwardQuestion 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_forwardIn a transistor circuit, collector load is 4 kΩ whereas quiescent current (zero signal collector current) is 1 mA. (i) What is the operating point if VCC = 10 V ? (ii) What will be the operating point if RC = 5 kΩ ?arrow_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