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How do you identify a particular feedback topology in a circuit?
Wiki User
∙ 12y ago
For analyzing the feedback amplifier, it is necessary to go through the following steps.
Step 1 : Identify topology ( Type of feedback)
1. To find the type of sampling network
(i) By opening the output if feedback signal becomes zero, then it is called "voltages sampling"
(ii) By shorting the output loop if feedback signal becomes zero, Then it is called "Current Sampling"
2. To find the type of mixing network
(i) If the feedback signal is subtracted from the externally applied signal as a voltage in the input loop, it is called "Series Mixing"
(ii) If the feedback signal is subtracted from the externally applied signal as a current in the input loop, it is called "Shunt Mixing"
Thus by finding the type of sampling network and mixing network, type of feedback amplifier can be determined. for example, If amplifier users a voltages sampling and series mixing, then it is called a voltages series amplifier
Wiki User
∙ 12y ago
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by learning to understand the circuit
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The negative feedback tends to stabilize the circuit; positive feedback would make it more unstable. For example, the "beta" of a transistor OF THE SAME SERIES - this is basically the amplification factor - may vary between 100 and 1000. With negative feedback, the circuit is hardly affected by these changes in beta - at the cost of a reduced amplification.
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How do you identify suitable test points with in a circuit?
by learning to understand the circuit
Why emitter bias circuit is called self bias?
emitter bias provides a feedback to the circuit so that circuit remains in linear regionn
Why negative feedback amplifier is preferred to positive feedback amplifier?
The negative feedback tends to stabilize the circuit; positive feedback would make it more unstable. For example, the "beta" of a transistor OF THE SAME SERIES - this is basically the amplification factor - may vary between 100 and 1000. With negative feedback, the circuit is hardly affected by these changes in beta - at the cost of a reduced amplification.
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How do I identify if a field effect transistor is defective in a circuit?
Is you'll need to short circuit between the drain and the source to identify FET test
