Microelectronic Circuits (The Oxford Series in Electrical and Computer Engineering) 7th edition
7th Edition
ISBN: 9780199339136
Author: Adel S. Sedra, Kenneth C. Smith
Publisher: Oxford University Press
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Chapter 7, Problem D7.76P
To determine
The nominal value and the range of the
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1. A small-signal amplifier
(a) Uses only a small portion of its load line
(c) Goes into saturation once on each input cycle
(b) always has an output signal in the mV range
(d) is always a common-emitter amplifier
2. The parameter h fe corresponds to
(a) BDc
(b) Bac
(c) r'e
(d) r'c
3. If the de emitter current in a certain transistor amplifier is 3 mA, the approximate value of r: is
(a) 3 k2
(h) 3 2
(c) 8.33 2
(d) 0.33 k2
4. A certain common-emitter amplifier has a voltage gain of 100. If the emitter bypass capacitor is removed,
(a) The circuit will become un stable
(b) the voltage gain will decrease
(d) the Q-point will shift
(c) The voltage gain will increase
5. For a common-collector amplifier, RE =1002, r'e= 10 2, and Bac=150. The ac input resistance at the base
is:
(a) 1500 Q
(b) 15 kN
(c) 110 N
(d) 16.5 k2
6)
the "simplest" model of transistor behavior in this problem, i.e., B = o and IB = 0,
with forward bias voltage of AVBE = 0.6V.
Consider the following circuit with a transistor and two resistors. You may use
5V
a) Determine the output when Vin = 0.5V.
9kN
Vout
Vin
3002
3kN
b) Determine the output when Vin = 1.2 V.
c) Determine the output when Vin = 3.6 V.
In the circuit shown in Figure 1, the input signal vsig is a small sine-wave signal with zeroaverage. The transistor β is 100.Figure 1: BJT Amplifier(a) Draw the equivalent DC circuit (b) Find the value of RE to establish a dc emitter current of about 0.5 mA.(c) Find RC to establish a dc collector voltage of about +0.5 V, (d) For RL = 10KΩ, draw the small-signal equivalent circuit of the amplifier and determineits overall voltage gain. (e) What is the input resistance of the amplifier circuit?
Chapter 7 Solutions
Microelectronic Circuits (The Oxford Series in Electrical and Computer Engineering) 7th edition
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- State whether the following statements are TRUE or FALSE 1 A class A amplifier should be biased midway between saturation and cutoff. The drain curves for a D-MOSFET are similar to those of a JFET when the MOS device is operating in the depletion mode. 3 The pinch-off voltage separates the ohmic and active regions for VGs =VGsoff Fill in the blanks 4 The voltage that turns on an E-MOSFET device is the. .voltage . The transfer characteristic curve is a graph of versus gate-source voltage. A certain class A power amplifier with an input signal power of 100 mW and power gain of 50 . Then the power delivered to the load is 6. Choose the most suitable correct answer A unipolar transistor uses 7 A) Both free electrons and holes C) Only free electrons B) Only holes D) Either free electrons or holes, but not both 8 To get a negative gate-source voltage in a self-biased JFET circuit, you must have a A) Voltage divider B) Source resistor C) Ground D) Negative gate supply voltage The voltage gain…arrow_forwardAn NPN BJT with B = 90 is used in a common-collector amplifier configuration and is biased such that IB = 90 μA with RL = 800 Q2. It is connected to an ac input signal with a signal resistance of 1 k. Assume that V₁ = 25 mV and determine the overall voltage gain, Gy. Gv = 0.976 OGv = 0.949 Gv = 0.959 Gv = 0.983arrow_forwardV* = + |ov Ri Rip ERC Vs RE V: -sV The following parameters are given for this transistor: B = 200 and VA = o. Design the circuit with the following value ICQ = 1.5mA and VCEQ = 5V. Find the small signal voltage gain AV = Vo/Vs. Find the input resistance in the signal source Vs.arrow_forward
- A common emitter amplifier has a 15V power supply. If we design for a 6.5V swing (peak voltage) at the output voltage what will the DC voltage drop be across RE? Group of answer choices 2V 10V 6.5 5Varrow_forward10-when the emitter resistance RE doubles the ac emitter resistance a-Increases. b-decreases. c-Remains the same. d-Cannot be determined. 11-To reduce the distortion in a CE amplifier, reduce the a-DC emitter current. b-Base-emitter voltage. c-Collector current. d-AC base voltage. 12-The output voltage of a CE amplifier is a-Amplified. b-Inverted. c-180° out of phase with the input. d-All of the above.arrow_forwardThe input resistance at the base of a biased transistor depends mainly on: Please select one: a. RB b. β_dc and RE c. RE d. β_dcarrow_forward
- Given an Emitter-Stabilized Bias Common Emitter amplifier with the following data:VCC = 15 V, IC = 2.4 mA, VC = 8.1 V, VE = 2.4 V and β = 120 Find the following: a. emitter current b. collector to emitter voltage c. emitter resistor d. collector resistor e. base resistorarrow_forwardThe circuit shown above is the ac model for a Common Collector amplifier. Determine the value of the following circuit elements. a) ro b) RE c) RL d) gm e) RB f) rπ g) Rsigarrow_forwardConsider the circuit shown below of a common source amplifier with a current mirror bias. Find the following: a. Find kp and kn. b. Find the drain current of M2 given that IBIAS = 2mA and VouT = 2.5V. c. Find the gm and r. of transistor M1. d. Sketch the small signal model of transistor M3 (Hint: Is there any small signal in any terminal of M3? If yes, then where is it? If no, then what happens to the small signal model?). It is given that the NMOS (M1) parameters are H,Con = 3mA/V? , VTH,n = 0.5V and A = 0.02 and the PMOS (M2 and M3) parameters are µ.Cox = 1mA/V? and VTH,p = -0.6V. The PMOS transistor M3 does not have channel length modulation while PMOS transistor M2 has A = 0.02. It is also given that the dimensions of M2 and M3 have equal widths of 5µm and lengths of L2 = 3µm and L3 = 1.5µm, respectively. M1 has length of L1 = 1µm and width of W1 = 2µm. 5V 5V M3 M2 VOUT VIN M1 IBIASarrow_forward
- You can find answers, choose true / false, and then correct the error 1. The quiescent power dissipation occurs when the maximum signal is applied. 2. Efficiency is the ratio of output signal power to total power. 3. Each transistor in a class B amplifier conducts for the entire input cycle. 4. A current mirror is implemented with a laser diode. 5. Darlington transistors can be used to increase the input resistance of a class AB amplifier. 6. The output of a class C amplifier is a replica of the input signal.arrow_forwardFor a common-collector amplifier, RE = 100N, r. = 10N, and 30ac = 150. If a 10 mV signal is applied to the base , the output signal is approximately 10 mV 150 mV 1.5 V 100 mVarrow_forwardState whether the following statements are TRUE or FALSE 1 A class A amplifier should be biased midway between saturation and cutoff. 2 The drain curves for a D-MOSFET are similar to those of a JFET when the MOS device is operating in the depletion mode. 3 The pinch-off voltage separates the ohmic and active regions for VGs =VGSoff Fill in the blanks 4 The voltage that turns on an E-MOSFET device is the.... .voltage . 5 The transfer characteristic curve is a graph of versus gate-source voltage. A certain class A power amplifier with an input signal power of 100 mW and power gain of 50 . Then the power delivered to the load is .... 6arrow_forward
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