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Because the feedback of an amplifier tends to reduce the gain of an amplifier and also, the bandwidth of feedback increases the gain of an amplifier, so in an high gain amplifier as to be stabilized.
BY
ENGINEER MUHAMMED OLALEYE OLUWATOSIN
TELECOMMUNICATION STUDENT, RUFUS GIWA POLYTECHNIC, OWO
Wiki User
∙ 11y ago
Wiki User
∙ 11y agoPositive feedback results in an ever increasing signal from the amplifier, resulting in excessive output and possible damage to speakers. For example, when you plug a microphone into an amplifier and place it in front of the speaker attached to that amp. The signal from the speaker goes into the microphone, where it is amplified even more, etc, etc, and results in the shriek you so often hear when a system is not set up properly. Negative feedback dampens the signal, so the "echoes" don't result in a larger signal being generated.
Wiki User
∙ 12y agoto improve the gain
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Types of Negative feedback amplifier?
voltage amplifier feedback current amplifier feedback transconductance feedback transresistance feedback
Is an amplifier a negative feedback?
Yes, Amplifire have negative feedback.
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.
What is current series feedback amplifier and its uses?
current series feedback amplifier=series parallel feedback amplifier or voltage to current amplifier,or TRANS CONDUCTANCE AMPLIFIER.
What is a programmable gain amplifier?
A programmable gain amplifier (PGA) is a electrical circuit that allows the controller (user, machine) to adjust its transfer function so as to provide larger or lesser voltage gain. Usually it is a simple circuit, using an operational amplifier with negative feedback. In the negative feedback loop, several resistors and switches open and close, in order to achieve the desirable gain.
Types of Negative feedback amplifier?
voltage amplifier feedback current amplifier feedback transconductance feedback transresistance feedback
Is an amplifier a negative feedback?
Yes, Amplifire have negative feedback.
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.
What is feedback amplifer?
A negative feedback amplifier (or more commonly known as feedback amplifier)can be defined as an amplifier which combines a fraction of the output with the input so that a negative feedback opposes the original signal.
What is the effect of negative feedback in a noninverting amplifier?
Negative feedback in a noninverting amplifier results in improved stability and reduced drift.
What is negative feedback in an amplifier?
feedback that reduces gain to help stabilize amplifier operation. gain is easy and cheap to get, stability isn't. its a tradeoff. so amplifier is deliberately designed with much more gain than needed and negative feedback sacrifices some of that gain to stabilize it.
Difference between the negative and positive feedbacks?
Negative feedback helps maintain stability in a system by counteracting any deviation from a set point, while positive feedback amplifies or enhances the deviation from the set point. Negative feedback loops help regulate processes in the body, such as temperature control, while positive feedback loops are less common and tend to lead to a change in the system.
What is use of negative feedback in amplifier?
Reduce the distortion in output signal.
Explain how negative feedback in an amplifier helps in reducing the distortion?
A: An amplifier operates withing its open loop response a negative feedback insure that the amplifier remains in its linear region. therefore reducing effects of saturation, storage time to name a few.
Explain current shunt negative feedback amplifier?
describe current-shunt negative feedback as applied to operational amplifiers, including derivations of the gain relation for each type of negative feedback.
The voltage gain of an inverting operational amplifier with negative feedback is controlled by the ratio of?
The series input resistor and the feedback resistor.
How do you stabilize an amplifier?
One method is by adding negative feedback from the output to the input stages.
