X

Download Operational amplifier University of Minnesota Duluth PowerPoint Presentation

SlidesFinder-Advertising-Design.jpg

Login   OR  Register
X


Iframe embed code :



Presentation url :

Home / Science & Technology / Science & Technology Presentations / Operational amplifier University of Minnesota Duluth PowerPoint Presentation

Operational amplifier University of Minnesota Duluth PowerPoint Presentation

Ppt Presentation Embed Code   Zoom Ppt Presentation

PowerPoint is the world's most popular presentation software which can let you create professional Operational amplifier University of Minnesota Duluth powerpoint presentation easily and in no time. This helps you give your presentation on Operational amplifier University of Minnesota Duluth in a conference, a school lecture, a business proposal, in a webinar and business and professional representations.

The uploader spent his/her valuable time to create this Operational amplifier University of Minnesota Duluth powerpoint presentation slides, to share his/her useful content with the world. This ppt presentation uploaded by worldwideweb in Science & Technology ppt presentation category is available for free download,and can be used according to your industries like finance, marketing, education, health and many more.

About This Presentation

Slide 1 - 1 Feedback of Amplifier Circuits I Feedback is to return part of the output to the input for a circuit/system (amplifiers in our context) Feedback is very useful in Control Theory and Systems and is well researched Amplifier circuit can have negative feedback and positive feedback. Negative feedback returns part of the output to oppose the input, whereas in positive feedback the feedback signal aids the input signal. Both negative feedback and positive feedback are used in amplifier circuits Negative feedback can reduce the gain of the amplifier, but it has many advantages, such as stabilization of gain, reduction of nonlinear distortion and noise, control of input and output impedances, and extension of bandwidth Graphs are from Prentice Hall
Slide 2 - 2 Concept of amplifier feedback Thus, the closed-loop gain would be much more stable and is nearly independent of changes of open-loop gain Thus, in a negative feedback amplifier, the output takes the value to drive the amplifier input to almost 0 (this is summing point constraints).
Slide 3 - 3 Amplifier negative feedback: reduce nonlinear distortion If a pre-amplifier with gain 1000 is placed before the nonlinear one so that the whole amplifier is used with negative feedback, and the gain for whole amplifier becomes: which greatly reduce the nonlinear distortion. This is achieved through compensatory distortion of the input signal
Slide 4 - 4 Amplifier negative feedback: noise reduction If an amplifier (assumed to be noise free or very low noise) is placed before the noisy amplifier, then the Signal-to-Noise (SNR) ratio is greatly enhanced (by a factor equal to the preceding amplifier gain) As a summary, negative feedback is very useful in amplifier circuits. It can help stabilize the gain, reduce nonlinear distortion and reduce noise. Also, as will be shown later, negative feedback in amplifiers can also control input and output impedance.
Slide 5 - 5 Amplifier negative feedback types
Slide 6 - 6 Amplifier negative feedback types If the feedback network samples the output voltage, it is voltage feedback. If it samples the output current, it is current feedback. The feedback signal can be connected in series or in parallel with the signal source and the amplifier input terminals, so called series feedback and parallel feedback. So, there are four types of negative feedback in amplifier circuits: Series voltage feedback (corresponding to (a) in previous slide) Series current feedback (corresponding to (b) in previous slide) Parallel voltage feedback (corresponding to (c) in previous slide) Parallel current feedback (corresponding to (d) in previous slide) In voltage feedback, the input terminals of the feedback network are in parallel with the load, and the output voltage appears at the input terminals of the feedback block. Whereas in current feedback, the input terminals of the feedback network are in series with the load, and the load current flows through the input of the feedback block. As a result, a simple test on the feedback type is to open-circuit or short-circuit the load. If the feedback signal vanishes for an open-circuit load, then it is current feedback. If the feedback signal vanishes for a short-circuit load, it is voltage feedback.
Slide 7 - 7 Effect of negative feedback on gain In series voltage feedback, input signal is voltage and output voltage is sampled, so it is natural to model the amplifier as a voltage amplifier. Amplifier employing series current feedback is modeled as a transconductance amplifier. Amplifier employing parallel voltage feedback is modeled as a transresistance amplifier. Amplifier employing parallel current feedback is modeled as a current amplifier.
Slide 8 - 8 Negative feedback on input impedance For series feedback, the following model can be used for analysis of input impedance (the output x could be either voltage or current) If the input impedance of the open-loop amplifier is Ri, then the closed-loop impedance is so, series feedback (either current or voltage) increase the input impedance Similarly, the effect of parallel feedback on input impedance can be analyzed using a similar model, the closed-loop input impedance would then be so, parallel feedback decrease the input impedance
Slide 9 - 9 Negative feedback on output impedance For voltage feedback, (it could be either series or parallel feedback), the closed-loop impedance is so, voltage feedback decrease the output impedance Similarly, for current feedback (either series or parallel feedback), the closed-loop impedance is so, current feedback increase the output impedance As a summary, negative feedback tends to stabilize and linearize gain, which are desired effects. For a certain type of amplifier, negative feedback tends to produce an ideal amplifier of that type. For example, series voltage feedback increases input impedance, reduces output impedance, which gets closer to an ideal voltage amplifier. So, negative feedback should be used in amplifiers circuits.
Slide 10 - 10 Some practical feedback network in amplifiers In practice, negative feedback network consists of resistor or capacitors , whose value is much more precise and stable than active devices (such as transistors). Then amplifier characteristics mainly depends on feedback network, thereby achieving precision and stability.
Slide 11 - 11 Design of negative feedback amplifiers A few steps to design negative feedback amplifiers: Select the feedback type and determine feedback ratio Select an appropriate circuit configuration for the feedback network (adjustable resistor can be used so that feedback ratio can be set precisely) Select appropriate values for resistance in the feedback network (this could be a difficult step due to various tradeoffs) E.g., in series voltage feedback (like the non-inverting amplifier), we do not want the feedback resistance too small because it loads the output of the amplifier, on the other hand, we do not want feedback resistance too large because it would cause part of the source signal to be lost). Verify the design using Computer Simulations (real circuits could be very different from the ideal case)
Slide 12 - 12 An example of feedback voltage amplifier Real input and output impedance is different from what is predicted from the formula in the ideal case. But it is always a good initial guess. You might need to try out multiple iterations to achieve a good design.
 

Frequently Asked Questions

> About SlidesFinder?

Slidesfinder is a website that allows users to upload and share their PowerPoint presentations online. It provides a platform for individuals and businesses to share their ideas and knowledge through presentations, and for others to view and download these presentations for educational or professional purposes.
Slidesfinder offers a wide range of presentation topics and categories, including business, education, science, technology, health, and more. Users can also search for presentations using keywords, tags, or by category. The website provides tools to create professional presentations with rich media, animations, and graphics.



One of the key features of Slidesfinder is its user-friendly interface, which allows users to easily upload, view, and share presentations. Users can also embed their presentations in their websites or blogs using the website's embed code feature.
Slidesfinder also offers premium services, such as the ability to create private presentations and to download presentations in high-quality formats. However, the basic features of Slidesfinder are free to use, making it accessible to anyone who wants to share their ideas and knowledge through presentations.

> How do I register with SlidesFinder?

Go to registration page (you can see signup link on top of website page) https://www.slidesfinder.com/signup . If you have facebook/gmail account them just click on SIGN IN WITH FACEBOOK OR SIGN IN WITH GOOGLE button, by this you will be a registered member of slidesfinder without filling any form, required detail automatically will be fatch from your account. If you do not a Facebook account, then click on "Signup". Fill all required fields and you will be a registered member of slidesfinder.

> Is slidesfinder account confirmation is mandatory?

Yes it is mandetory to active your account to login.

> Do I need to signup/login on SlidesFinder before uploading a PowerPoint presentation?

Yes, you need to login with your account before uploading presentation. Your username will be displayed on your uploaded presentation. Your registered email id is needed for sending your stats of uploaded presentation.

Slidesfinder is a sharing website for PowerPoint presentations search and share. Find your interest in the form of powerpoint presentations on slidesfinder and save your valuable time . On Slidesfinder you get presentations from our huge library of professional ppt presentations. We believe in making your search INFORMATIVE and FUN. Find your best ppt presentation from a pool of PowerPoint presentations stacked under important industry categories like business & management, heath & Wellness,eduction & training etc. We provide unique informative PowerPoint presentation for marketers, presenters and educationists. These professional PowerPoint presentations are uploaded by professionals from across numerous industry segments.These ppt presentations are available for FREE download.

Not just finding your interest, but facilitate you broadcast your interest. We have created this platform for easy sharing of PowerPoint presentations, ensuring that these presentations get maximum exposure. Create your slidesfinder account and upload PowerPoint presentations for free, share on social media platforms and BUILD YOUR CROWD WITH PRESENTATION !!

The Great Buddha says, "Share your knowledge.It’s a way to achieve immortality"! So, start sharing knowledge and we are here to make that immortal !!

© 2013-2024 SlidesFinder. All rights reserved.

Re-productivity of content are not allowed. Without prior written permission from author, commercial use of any content is illegal.