Chap7part4 (2)
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The document discusses the frequency response analysis of an emitter follower (EF) amplifier. It covers calculating the DC operating points and small signal parameters. Low frequency and high frequency analyses are performed using the Gray-Searle technique to determine pole and zero frequencies. The EF amplifier is found to have superior high frequency performance compared to a common emitter amplifier due to its higher dominant pole frequency and avoidance of the Miller effect. While its voltage gain is limited to around 1, the EF amplifier maintains current gain similar to the common emitter configuration.
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![Emitter-Follower (EF) Amplifier ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Ch. 7 Frequency Response Part 4 High and Low Frequency AC Equivalent Circuit](https://image.slidesharecdn.com/chap7part4-2-1323937258-phpapp01-111215022140-phpapp01/85/Chap7part4-2-1-320.jpg)
![EF Amplifier - DC Analysis (Nearly the Same as CE Amplifier) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Ch. 7 Frequency Response Part 4 R 1 = 10K R 2 = 2.5K R C = 0 K R E = 0.33K Note: Only difference here from CE case is V CE is larger since R C was left out here in EF amplifier.](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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Exam: 086044RR - Modulation and Detection Circuits
When you have completed your exam and reviewed your answers, click Submit Exam. Answers will not be recorded until you
hit Submit Exam. If you need to exit before completing the exam, click Cancel Exam.
Questions 1 to 25: Select the best answer to each question. Note that a question and its answers may be split across a page
break, so be sure that you have seen the entire question and all the answers before choosing an answer.
R
MAA/V—
f =600 kHz
C -0.000352
L =200 £iH
R=101A
1. Look at the circuit shown in the figure above. The frequency of the power supply is 600 kHz, the
capacitance of C is 0.000352 jiF the inductance of L is 200 |aH, and the resistance of R is 10 Q. What
would be the calculated effective resistance (RJ of this circuit?
A. 56,818 fi
B. 52,119 Q
C. 10,461 n
D. 43,167 n
2. An unmodulated carrier has an amplitude of 5 V. When modulated, the maximum amplitude is 10 V.
What is the modulation percentage?
A. 50 percent
B. 120 percent
C. 30 percent
D. 100 percent
3. In a standard AM transmission with 100 percent modulation,
A. the sideband amplitude is 70.7 percent of the carrier amplitude.
B. the sideband amplitude is one-eighth of the carrier amplitude.
C. the sideband amplitude is one-fourth of the carrier amplitude.
D. the sideband amplitude is 50 percent of the carrier amplitude.
^A/Wsr-
f =600 kHz
C =0,000352 fiF
L=20QmH
R=ioy?
4. For the circuit shown in the figure above, what would be the calculated value of the inductive reactance
(Xj)? (Round your answer to the nearest whole number.)
A. 942 D.
B. 1,057 a
C. 754 a
D. 598 a
5. A 1.5 MHz carrier frequency is amplitude-modulated by a 200 kHz sinewave audio signal. The
bandwidth would be
A. 4,000 kHz.
B. 400 kHz.
C. 405 kHz.
D. 40 kHz.
6 . modulation is particularly adaptable to computer systems, data transmission, and space
communications.
A. Pulse-amplistude
B. Pulse-position
C. Phase
D. Pulse
7. Some methods of pulse modulation provide for transmission of a number of channels on a single carrier.
That is accomplished by dividing the transmission time among the several channels, which is called
A. damping.
B. multiplexing.
C. frequency-shift keying.
D. duplexing.
8. A 1,200 kHz RF carrier is amplitude-modulated by a 500 Hz sinewave audio signal. The upper sideband
frequency would be
A. 1,195 kHz.
B. 1,205 kHz.
C. 120.5 kHz.
D. 1,200.5 kHz.
9. In a Foster-Seeley phase shift discriminator, certain voltage conditions depend on whether the input
signal is at, above, or below resonance. Look at the vector diagram shown in the figure above. Which of
the following statements correctly describes the circuit represented by this vector diagram?
A. The input signal in this circuit is at resonance, and the discriminator's secondary voltages cancel each other.
B. The input signal is above resonance, and no output signal will be produced.
C. The output signal produced will be directly ...
Operational amplifier UA741
The document summarizes the design and analysis of the uA741 operational amplifier, which was one of the most popular op-amps ever made. It describes the op-amp's stages including input, gain, and output stages. It also analyzes the op-amp's DC bias point, small signal behavior through frequency and transient analysis, and how it performs under variations through Monte Carlo analysis. The document shows that the uA741 design is robust to changes in components and operates as intended across a wide range of conditions.
Exp passive filter (6)
This document describes an experiment to analyze the frequency response characteristics of passive first-order low-pass and high-pass filters by plotting the gain and phase response of RC filter circuits. The objectives are to determine the cutoff frequency and roll-off points of the filters by varying the resistor and capacitor component values and observing how this affects the frequency response. The results show that changing the resistor or capacitor values changes the cutoff frequency as expected, while maintaining a roll-off of approximately 20dB per decade above/below cutoff for the low-pass and high-pass filters respectively.
AM Radio Receiver with Automatic Gain Control Unit
This document summarizes the design and implementation of an AM radio receiver circuit with an automatic gain control (AGC) unit. It includes:
- A block diagram of the full circuit including an antenna, tuned filter, peak detector, AGC unit, RF amplifier, audio amplifier, and loudspeaker.
- Descriptions of each circuit block, including simulations of the tuned filter, peak detector, RF amplifier, and audio amplifier.
- Issues encountered in implementing the peak detector, AGC unit, and audio amplifier circuits experimentally that differed from simulations.
- An overview of the experimental setup and limitations encountered with certain circuit elements like the peak detector time constant and heating in the audio amplifier transistors.
Bipolar junction transistor : Biasing and AC Analysis
1. The document discusses various transistor amplifier circuit designs and analysis techniques, including biasing circuits like base bias, voltage divider bias, and emitter feedback bias.
2. It introduces the small-signal h-parameter transistor model that represents the transistor under AC conditions and defines terms like small-signal current gain and output conductance.
3. The document provides examples of calculating Q-points, load lines, and biasing component values for different transistor amplifier circuits.
3 Basic Electronics 3
The document provides an overview of basic electronics concepts including:
- Ohm's law defines the relationship between voltage, current, and resistance.
- Circuit diagrams use symbols to represent components like batteries, resistors, and capacitors connected by wires.
- Resistors can be connected in series or parallel configurations which changes how voltage and current are distributed.
- Capacitors store charge and can be used to filter signals with resistor-capacitor circuits functioning as low-pass or high-pass filters.
- Inductors involve relationships between voltage, current, and inductance and can also be used in filter circuits.
07 basic-electronics
The document provides an overview of basic electronics concepts including:
1) Ohm's law defines the relationship between voltage, current, and resistance in circuits.
2) Schematics use symbols to represent circuit elements and show how they are connected.
3) Resistors in series and parallel follow specific rules to calculate total resistance.
4) Capacitors store charge and their behavior changes with frequency based on impedance.
Transisitor amplifier
Electrical current, voltage, resistance, capacitance, and inductance are a few of the basic elements of electronics and radio. Apart from current, voltage, resistance, capacitance, and inductance, there are many other interesting elements to electronic technology. ... Use Electronics Notes to learn electronics online.
Exp1 (passive filter) agdon
This document outlines objectives and procedures for analyzing low-pass and high-pass filters. It includes plotting gain and phase responses, determining cutoff frequencies, and observing how component values affect cutoff frequency. Key points are:
- Low-pass filters pass low frequencies and reject high frequencies, with output dropping 20dB/decade above cutoff.
- High-pass filters pass high frequencies and reject low frequencies, with output dropping 20dB/decade below cutoff.
- Cutoff frequency is where output drops 3dB and is calculated from component values.
- Phase shifts from 0 to -90 degrees for low-pass, and 0 to 90 degrees for high-pass, being 45 degrees at cutoff.
Exp passive filter (2)
This document outlines objectives and procedures for analyzing low-pass and high-pass filters. It includes plotting gain and phase responses, determining cutoff frequencies, and examining how component values affect cutoff frequency. Key points are:
- Low-pass filters pass low frequencies and reject high frequencies, with output dropping 20dB/decade above the cutoff frequency.
- High-pass filters pass high frequencies and reject low frequencies, with output dropping 20dB/decade below the cutoff frequency.
- Cutoff frequency is where the output drops to 70.7% of the maximum and is determined by component values based on formulas.
Types of Multistage Transistor Amplifiers
A multistage transistor amplifier uses multiple single amplifier stages connected in cascade through a coupling device. The coupling device transfers the AC output of one stage to the input of the next while isolating the DC. Common coupling methods include RC coupling using a capacitor, transformer coupling, and direct coupling without isolation. Transformer coupling provides impedance matching between stages for increased voltage and power gain compared to RC coupling, making it suitable for power amplification applications.
ECE 312 Current Feedback Operational Amplifier (final project)
This document summarizes Jon Lepp's final project designing a current feedback operational amplifier (CFOA). The project involved simulating the CFOA design in order to analyze its DC operating points, transient response, gain, bandwidth, and slew rate. The simulations and experimental data confirmed the design functions as a low-pass filter with a cutoff frequency of around 10 MHz and a gain of 2 for low frequency inputs. Oscilloscope captures showed increasing signal distortion at higher frequencies and noise in the output for a square wave input.
EC2-NOTES-PPT.ppt
1. The document discusses various topics related to electronic circuits including feedback amplifiers, oscillators, tuned amplifiers, and wave shaping circuits. It provides details on different types of feedback, oscillators, tuned amplifier configurations, and non-linear circuit elements like diodes that are used for wave shaping.
2. Key aspects covered include negative and positive feedback, characteristics of different oscillator circuits like RC, crystal, and multivibrator oscillators. Tuned amplifier types such as single, double, and stagger tuned are explained.
3. Wave shaping circuits using diodes as clippers, clampers are described. Bistable multivibrator circuit operation is outlined. Circuit analysis and design considerations for stability are provided
orca_share_media1489816591592333333333.pptx
A single stage transistor amplifier uses one transistor to amplify a weak signal. It works by taking a small alternating current (AC) base current and producing a larger collector current that is proportional to the base current. This larger current passes through a resistor, producing an amplified output voltage. A multistage transistor amplifier contains multiple amplification stages coupled together with capacitors. Capacitors block direct current between stages while allowing the AC signal to pass, achieving additional amplification. Key terms include gain, frequency response, decibel gain, and bandwidth, which describe how well an amplifier performs over different frequencies.
Lesson4
Resonant Circuits as Filters,Transformers,A Simple Amplifier,Common Collector Amplifier,The SW+ Driver
Voltage Amplifier
A voltage amplifier circuit is a circuit that amplifies the input voltage to a higher voltage. So, for example, if we input 1V into the circuit, we can get 10V as output if we set the circuit for a gain of 10. Voltage amplifiers, many times, are built with op amp circuits.
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Chap7part4 (2)
- 3. EF Amplifier - Midband Gain Analysis Ch. 7 Frequency Response Part 4 Equivalent input resistance R i V i + _ R i V b + _ I π DC analysis is nearly the same! I B , I C and g m are all the same. Only V CE is different since R C =0. V O NOTE: Voltage gain is only ~1! This is a characteristic of the EF amplifier! Cannot get voltage gain >1 for this amplifier!
- 5. Emitter Follower - Analysis of Low Frequency Poles Gray-Searle (Short Circuit) Technique Ch. 7 Frequency Response Part 4 Input coupling capacitor C C1 = 2 μ F R i V i I π I X
- 8. Emitter Follower - Low Frequency Poles and Zeros Magnitude Bode Plot Ch. 7 Frequency Response Part 4
- 9. Emitter Follower - Low Frequency Poles and Zeros Phase Shift Bode Plot Ch. 7 Frequency Response Part 4
- 12. Emitter Follower - Analysis of High Frequency Poles Gray-Searle (Open Circuit) Technique Ch. 7 Frequency Response Part 4 Modified Equivalent Circuit Replace this with this. Z B ’ Z B ’ z π =1/y π Looks like a resistor in parallel with a capacitor.
- 18. Emitter Follower - High Frequency Poles and Zeros Magnitude Ch. 7 Frequency Response Part 4
- 19. Emitter Follower - High Frequency Poles and Zeros Phase Shift Ch. 7 Frequency Response Part 4
- 20. Comparison of EF to CE Amplifier (For R S = 5 Ω ) Ch. 7 Frequency Response Part 4 CE EF Midband Gain Low Frequency Poles and Zeros High Frequency Poles and Zeroes Better low frequency response ! Much better high frequency response !