Nobody downloaded yet

Circuits with Feedback - Assignment Example

Comments (0) Cite this document
Summary
The paper "Circuits with Feedback " is purposed to solve the problems when the equation for the gain of a feedback amplifier is obtained, each of the amplifiers incorporate series feedback, the amplifier has a gain of 150 or to show how to produce a voltage series feedback network…
Download full paperFile format: .doc, available for editing
GRAB THE BEST PAPER98.3% of users find it useful
Circuits with Feedback
Read TextPreview

Extract of sample "Circuits with Feedback"

Download file to see previous pages Derivation of Feedback Equation for Inverting Amplifier
Let we consider an inverting amplifier as shown in fig. 2.

Then if ‘A, is the gain then, as vi+ = 0, there fore

vo = A(vin+ – vin¯)

vo = - A vin¯
Also from Ohm’s Law the current is simply the difference in the voltage across R1 divided R1,

i1 = (vin+ – vin¯)/R1 ……(5)

Similarly, if = ( vi¯ – vo)/Rf ……(6)

By Kerchief’s current Law at the inverting input,

i1 = if + i¯ where i¯ is the current entering the amplifier at

it’s inverting point, yet for an idea amplifier it reaches to zero hence,

i1 = if ……… (7)

Substituting the values from equations (5) and (6) we have,

(vin+ – vin¯)/R1= (vi¯ – vo)/Rf ……… (8)

Or vin+/R1 – vin¯/R1= vi¯/Rf – vo/Rf

Solving for ,
= ……… (9)

This is the required voltage gain expression for inverting amplifier with feedback in

terms of open loop gain.

Problem 2: Each of the amplifiers shown below incorporate series feedback. The

gains, input resistances

and output resistances are quoted without feedback. For each amplifier determine: -

a) The feedback fraction.

b) The gain with feedback.

c) The input impedance with feedback.

d) The output impedance with feedback.

Solution: (i) a) If we consider the given cct. then for feedback fraction ‘β, for

given cct. is defined as,




...
terms of open-loop gain A.

Derivation of Feedback Equation for Inverting Amplifier

Let we consider an inverting amplifier as shown in fig. 2 (Bogart, 1997, p. 670).

Then if 'A, is the gain then, as vi+ = 0, there fore

vo = A(vin+ - vin)

vo = - A vin


Fig. 2(a)

Also from Ohm's Law the current is simply the difference in the voltage

across R1 divided R1,

i1 = (vin+ - vin)/R1 (5)

Similarly, if = ( vi - vo)/Rf (6)

By Kerchief's current Law at the inverting input,

i1 = if + i where i is the current entering the amplifier at

it's inverting point, yet for an idea amplifier it reaches to zero hence,

i1 = if (7)

Substituting the values from equations (5) and (6) we have,

(vin+ - vin)/R1= (vi - vo)/Rf (8)

Or vin+/R1 - vin/R1= vi/Rf - vo/Rf

Solving for ,
= (9)

This is the required voltage gain expression for inverting amplifier with feedback in

terms of open loop gain.

Problem 2: Each of the amplifiers shown below incorporate series feedback. The

gains, input resistances

and output resistances are quoted without feedback. For each amplifier determine: -

a) The feedback fraction.

b) The gain with feedback.

c) The input impedance with feedback.

d) The output impedance with feedback.

Solution: (i) a) If we consider the given cct. then for feedback fraction ', for

given cct. is defined as,

= (2ia)

Substituting the values in equation (2ia) from given cct. we have,

=


= 0.175 2ia


Fig. (2i)

(2ib) If 'Avf, be the gain ...Download file to see next pagesRead More
Cite this document
  • APA
  • MLA
  • CHICAGO
(“Circuits with Feedback Assignment Example | Topics and Well Written Essays - 1500 words”, n.d.)
Circuits with Feedback Assignment Example | Topics and Well Written Essays - 1500 words. Retrieved from https://studentshare.org/science/1514212-circuits-with-feedback
(Circuits With Feedback Assignment Example | Topics and Well Written Essays - 1500 Words)
Circuits With Feedback Assignment Example | Topics and Well Written Essays - 1500 Words. https://studentshare.org/science/1514212-circuits-with-feedback.
“Circuits With Feedback Assignment Example | Topics and Well Written Essays - 1500 Words”, n.d. https://studentshare.org/science/1514212-circuits-with-feedback.
  • Cited: 0 times
Comments (0)
Click to create a comment or rate a document

CHECK THESE SAMPLES OF Circuits with Feedback

Feedback

...?Methods of Feedback One very effective approach of providing learners with feedback is to establish example before them. In fact, it is the prime responsibility of a trainer to lead by example. Therefore, whenever I give my students a task to perform, I first demonstrate the procedure completely in front of them. For example, if it is about hair-dying, I would not just tell them how to do it, I would actually perform the procedure on a model in front of the whole class. This provides them with an opportunity to observe each step from start to end. I also have the procedure video-recorded and provide the students with the recorded videos to get help in case they forget some step while they perform. When the students have completed... their...
3 Pages(750 words)Essay

Circuits design and application

...the output of the analyzer is audio, so it can use any scope for the display. The analyzer functions as a Tunable RF Voltmeter. This makes it function as a natural receiver / transmitter tracing signals. A display of the frequency is provided using the analyzer on a transmitter. Owing to the high sensitivity of the instrument signal tracing receiver circuits are permitted from the antenna through the low-level Radio Frequency stages. Whereas a conventional RF voltmeter adds up all the individual voltages as a summation without indicating the components it is not the case with a spectrum analyzer. Additionally the analyzer displays local oscillator signal and its frequency and injection levels. A tracking generator...
5 Pages(1250 words)Essay

Feedback

...THIS IS YOUR JOB. Foreclosure Crisis: The impact to the American Dream and United s Economy Diz CollegeForeclosure Crisis: The impact to the American Dream and United States Economy Have you ever imagined owning a home? Have you ever pictured being able to fulfill the American Dream? For many decades the American dream of being prosperous and having a home was a reality for many people, but unfortunately we are experiencing a severe economic downturn that is considered one of the worst crises in last century that may lead this dream to an end. In fact, according to Tatom (2009), it is one of the biggest financial problems we have confronted since the great depression. Americans were not prepared for such catastrophe... IS YOUR JOB....
1 Pages(250 words)Essay

Circuits with Feedback and Sine Wave Oscillators

...Circuits with Feedback and Sine Wave Oscillators Response to Task 1Q1. Introduction The occurrence of an oscillator is such that part of the amplifier signal is send back to the input of that very amplifier (Ellinger, 2008). Because of this, the signal is amplified and resend back to the input upon which it becomes amplified once more. The process repeats itself several times ultimately leading to a loud noise from the speaker. This process of sending part of the amplifier output signal back to the input of is often referred to as feedback (Ellinger, 2008). As widely cited, as far as amplifiers are concerned, there are generally two types of feedback. These are positive...
10 Pages(2500 words)Coursework

Feedback

...Teacher Feedback Doing the LearnSmart Modules is very helpful for us It helps us understand the lesson better and get better grades. It works like a review or a practice set not only to learn more about the topic but also to get better scores in online quizzes. It also helps understand the chapter more because it clarifies some topics which are not clear in the chapter. It is therefore very useful because it prepares me for online assignments and quizzes. Especially with the LearnSmart Modules which allows me to take it as many times as I wanted until I get the lessons right. Without it, our scores and understanding of the lessons may have been poor. It is also interesting to engage in and is not stressful to take...
1 Pages(250 words)Assignment

Feedback

...Feedback The implementation has the potential of working effectively. This is because Starbucks is a global company, whichhas the resources to ensure that it penetrates all markets and competes with existing businesses. Thus, tailoring technological innovation and business strategies in specific countries and regions will create an opportunity for the company to exploit these markets in an effective manner. However, such cannot occur effectively if the company does not have an alignment of its objectives and goals to its business activities. This demands that the company targets markets and allocates resources to ensure that it exploits such markets. Target marketing is a good opportunity for the company, which will...
1 Pages(250 words)Essay

RC and RI circuits

... Introduction Capacitors are utilized in timing circuits within numerous devices. The time aids in maintenance of lightinglonger in order to remove the keys elements. The values are characterized with the time constants. This experiment measured the time constant of diverse capacitors in two conditions namely measuring the time constant for several seconds and measuring the time constants for microseconds. This experiment focuses on the examination of three electronic circuits containing passive components. The circuit diagrams were constructed utilizing Multisim software platform. The data and observation were recorded whilst simulating the above circuits. RC circuit contain both resistor connected in series and the capacitor... . The...
5 Pages(1250 words)Lab Report

Differential-Amp Circuits

...Laboratory Number: Op-Amp Circuits Lab Performance Submitted Dominick Lauria Lab Partner: Introduction: The instrumentation Amplifier is an improvement of differential amplifier circuit; its CMRR is not dependent on internal resistance of the sources. This is due to the summing point constraints at the lower and upper LM1458C inputs; there is no current is drawn from the signal source. These implies that the input impedance is seen by both sources as infinite therefore the output voltage is unaltered by the internal sources impedance, for example V1a=V2b=19.9V. Figure 1: Differential amplifier circuit Main Part: The First test: The circuit was built where Vs was 100Hz,...
3 Pages(750 words)Lab Report

Feedback

...Feedback Report al Affiliation) Feedback Report The answers posted by the were good responses to the questionsposed. The student managed to provide objective answers for all the questions. However, the student’s work has a few errors in grammar. Despite these errors, someone can understand the message that the student wanted to communicate. The student exhibited clarity in the language used in the explanations as well as clarity in the answering of the questions posed. From the responses given, the student exhibited the ability to reflect on the unit in question. The student also appears to have given thought to the answers provided in the reflection. The student offered a viable example of how...
1 Pages(250 words)Assignment

Feedback

...PROFORMA 7: Feedback from Other Professionals on Day to Day Practice on Placement: Additional Evidence Other professionals may wish to provide feedback on the student’s practice on placement (such as the student’s practice in multi-professional team meetings, case conferences or on joint visits). The practitioner providing the feedback is not required to be a registered social worker. This template can be used for other professionals to provide feedback to the student. It should not be used by the student’s Practice Educator. The Practice Educator may use this feedback to contribute to the holistic assessment of capability of the student. Section 1 Professional providing feedback to complete Name of Student mimi Name & role... of the...
2 Pages(500 words)Essay
sponsored ads
We use cookies to create the best experience for you. Keep on browsing if you are OK with that, or find out how to manage cookies.

Let us find you another Assignment on topic Circuits with Feedback for FREE!

Contact Us