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Block diagram of a feedback oscillator circuit to which the Barkhausen criterion applies. It consists of an amplifying element A whose output v o is fed back into its input v f through a feedback network β(jω). To find the loop gain, the feedback loop is considered broken at some point and the output v o for a given input v i is calculated:
This image is a derivative work of the following images: File:Block_diagram_for_feedback.PNG licensed with Cc-by-sa-3.0,2.5,2.0,1.0, GFDL . 2008-02-03T01:24:43Z Brews ohare 702x283 (23414 Bytes) {{Information |Description=Block diagram for single-loop feedback amplifier |Source=Own work |Date=02/02/08 |Author=Brews_ohare |Permission=Public domain |other_versions=None }} [[Category:Electrical ...
The output of the amplifier is applied to a feedback network with gain β, and subtracted from the input to the amplifier. The loop gain is calculated by imagining the feedback loop is broken at some point, and calculating the net gain if a signal is applied. In the diagram shown, the loop gain is the product of the gains of the amplifier and ...
This image is a derivative work of the following images: File:Simple_feedback_control_loop2.png licensed with Cc-by-sa-3.0-migrated, GFDL . 2008-08-11T12:29:56Z Coronafire 439x150 (3150 Bytes) {{Information |Description= Simple feedback control loop block diagram |Source= updated version from wikipedia:Control_theory |Date= 11/08/2008 |Author= Corona |Permission= free |other_versions= }}
where is the return ratio with the input source disabled (equal to the negative of the loop gain in the case of a single-loop system composed of unilateral blocks), G ∞ is the asymptotic gain and G 0 is the direct transmission term. This form for the gain can provide intuitive insight into the circuit and often is easier to derive than a ...
A simple negative feedback system is descriptive, for example, of some electronic amplifiers. The feedback is negative if the loop gain AB is negative.. Negative feedback (or balancing feedback) occurs when some function of the output of a system, process, or mechanism is fed back in a manner that tends to reduce the fluctuations in the output, whether caused by changes in the input or by ...
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The closed-loop transfer function is measured at the output. The output signal can be calculated from the closed-loop transfer function and the input signal. Signals may be waveforms, images, or other types of data streams. An example of a closed-loop block diagram, from which a transfer function may be computed, is shown below: