ELT-306 WA5
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School
Thomas Edison State College *
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Course
306
Subject
Electrical Engineering
Date
Jan 9, 2024
Type
docx
Pages
2
Uploaded by kevinalandro
Kevin Austin
ELT-306 WA 5
Questions:
1.
Describe what is meant by the voltage gain of an amplifier.
The voltage gain of an amplifier is a measure of how much the output voltage of the amplifier increases in relation to the input voltage. A higher voltage gain indicates that the amplifier can amplify the input signal more effectively.
Voltage gain (Av) is the ratio of the change in output voltage (ΔVo) to the change in input voltage (ΔVi): Av
=
ΔVo
ΔVi
or 20
×lo g
10
(
Av
)
2.
What is the primary purpose of coupling capacitors in transistor amplifiers?
The primary purpose of coupling capacitors is to block DC components while allowing AC signals to pass through. Problems:
1.
If the input voltage to an amplifier is 50 mV and the resulting output voltage is 3 V, calculate the voltage gain.
Av
=
Vo
Vi
=
3
V
50
mV
=
60
2.
A transistor is biased with IE
= 5 mA. Calculate r’e
.
r ' e
=
25
mV
5
mA
=
5
Ω
3.
For the circuit shown, calculate:
A.
The input resistance at the base of the transistor.
Rb= R
1
∨
¿
R
2
=
10
k Ω
∨
¿
2.2
k Ω
=
1.8
k Ω
B.
The input resistance of the amplifier.
Vb
=
Vcc
R
2
R
1
+
R
2
=
10
V
2.2
k Ω
12.2
k
=
1.8
V
V
E
=
V
B
−
0.7
V
=
1.8
−
0.7
=
1.1
V
I
E
=
V
E
R
E
=
1.1
V
820
Ω
=
1.34
mA
r ' e
=
25
mV
1.34
mA
=
18.66
Ω
Rin
=
β×r' e
=
200
×
18.66
=
3.72
k Ω
Rintotal
=
1.8
k Ω
∨
¿
3.72
Ω
=
1.2
k Ω
C.
The voltage gain.
Av
=
rc
r' e
=
3.6
k Ω
180
Ω
=
20
4.
If a circuit requires a capacitor to give good coupling at 200 Hz and the resistance the capacitor is connected to is 3 kΩ, what value capacitor is needed?
C
=
1
2
π f X
C
=
1
2
π
(
200
Hz
)(
3
k Ω
)
=
2.65
μF
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4.
A current measuring operational amplifier is
made by bridging a resistor across the inverting terminal (pin
2) and the output terminal (pin 6). The noninverting terminal
is grounded.
a.
Draw a sketch of the current measuring circuit.
Determine an appropriate resistor for converting a current
of 1.0 picoamperes (1.0 × 10-¹2 A) to a voltage of 0.010 V.
(The math for this question is very easy, don't overthink
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b.
There are a few reasons that circuit you drew in part a
will not be effective. First, you will have a difficult time
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Second, the input terminals do not have infinite resistance
value. In fact, for an inexpensive 741 op-amp, the input
terminal resistance may only be a few MOhms, which is far
less than the resistance your calculated for the feedback
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To a measurement range of -4 to 6 V, apply a 4-bit analog-to-digital converter.
1- Identify the assigned voltages to each of the bins.
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build an inverting summing amplifier with 2 inputs: a 1 V DC signal anda sine wave with an amplitude of 2 V and 1 kHz frequency.V Simulate for 2 msec
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Hint : Enter your answer to the 3rd nearest decimal place in seconds.
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please answer all thanks !
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Draw a simple diagram of a basic voltage amplifier including all components
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1.Sketch the output voltage against time diagram for the values given in Q4 in the following.
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R2 = 10,000 Ohms
cases:
a) Vin is a sine wave with peak-to-peak voltage of 8 V and period of 5 ms.
b) Vin is a sine wave with peak-to-peak voltage of 4 V and period of 5 ms.
Answers from question 4:
Vth1: -1.091 V Vth2: -2.909 V Vsym: 1.818V
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SEE MORE QUESTIONS
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Related Questions
- Please in typing format please ASAP for Thanks ?arrow_forward4. A current measuring operational amplifier is made by bridging a resistor across the inverting terminal (pin 2) and the output terminal (pin 6). The noninverting terminal is grounded. a. Draw a sketch of the current measuring circuit. Determine an appropriate resistor for converting a current of 1.0 picoamperes (1.0 × 10-¹2 A) to a voltage of 0.010 V. (The math for this question is very easy, don't overthink this question. b. There are a few reasons that circuit you drew in part a will not be effective. First, you will have a difficult time finding a resistance with the required resistance value. Second, the input terminals do not have infinite resistance value. In fact, for an inexpensive 741 op-amp, the input terminal resistance may only be a few MOhms, which is far less than the resistance your calculated for the feedback resistor. This means that more current will be drawn into the op-amp than will go around it. Finally, the op-amp may have a bias current that is larger than the…arrow_forwardTo a measurement range of -4 to 6 V, apply a 4-bit analog-to-digital converter. 1- Identify the assigned voltages to each of the bins. 2- Determine the voltage that will be assigned to a measurement reading -3.25 V. Calculate the percentage ADC error. 3- Determine the voltage that will be assigned to a measurement reading 4.11 V. Calculate the percentage ADC error. Solve step by step properly.arrow_forward
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Recommended textbooks for you
- Delmar's Standard Textbook Of ElectricityElectrical EngineeringISBN:9781337900348Author:Stephen L. HermanPublisher:Cengage Learning
Delmar's Standard Textbook Of Electricity
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ISBN:9781337900348
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Publisher:Cengage Learning