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What are four different effects of feedback on the function of an amplifier?
1. Negative feedback can increase linearity at the expense of losing gain. 2. & 3. Positive feedback can result in large increases in gain until the increases becomes so large that oscillation occurs. 4. Positive or negative feedback at one frequency can result in enhanced or decreased response to that frequency.
Types of Negative feedback amplifier?
voltage amplifier feedback current amplifier feedback transconductance feedback transresistance feedback
What is thermal stability of transistor?
The thermal stability is the ability of the transistor to withstand changes in temperature without the transistor's parameters changing. Transistors generally have poor thermal stability and in particular the Beta parameter increases with temperaure, which can cause thermal runaway in a badly designed circuit. This is well known and the bias current in transistors is normally stabilised by the application of negative feedback in proper circuit design.
What is sensitivity drift?
it is the amount by which instrument's sensitivity varies as ambient conditions change.
What kind of feedback is used in emitter follower?
emitter follower is a type of negative feedback ,
Effect of feedback on stability and sensitivity?
Feedback can cause a lack of stability. However, negative feedback can actually reduce distortion, noise, and sensitivity to the noise.
What is meaning of Transformer stability and sensitivity?
What is meaning of Transformer sensitivity?
What is the expression for sensitivity factor in negative feedback amplifier?
[1/(1+Ab)] is the expression for sensitivity...
Are inhibitory and stabilizing positive feedback?
Inhibitory feedback is not considered positive feedback; rather, it serves to dampen or reduce the activity of a system, promoting stability. Stabilizing feedback can be seen as a form of negative feedback, as it helps maintain equilibrium by counteracting disturbances. Positive feedback, on the other hand, amplifies changes and can lead to runaway effects or instability. Thus, inhibitory and stabilizing feedback mechanisms work to maintain balance, while positive feedback promotes further deviation from equilibrium.
What type of feedback exaggerates the effects of variations from normal?
posistive feedback
What is sensitivity of open loop control system?
The sensitivity of an open loop control system is always 1, it is due to no feedback involved in open loop.
What are the effects of feedback on time constant of control systems?
1.feedback in control system improves the speed of response2.using feedback in control system we can reduce the sensitivity of the system to parameter variation
What is the effect of feed back on gain?
A: Number one it provide stability for the amplifier or system. The greater the feedback the greater the stability but less gain. In other words gain is inversely related to feedback
What is the effect of negative feedback in a noninverting amplifier?
Negative feedback in a noninverting amplifier results in improved stability and reduced drift.
Where are Effects greater than their cause?
In systems with positive feedback (or multiplier effects).
What is the difference between positive and negative feedback loops?
Positive feedback loops amplify changes or effects, leading to an increase in the output or a runaway process, such as during childbirth when contractions intensify. In contrast, negative feedback loops counteract changes, promoting stability by reducing the output or returning a system to its set point, like how the body regulates temperature. Essentially, positive feedback drives growth or escalation, while negative feedback fosters balance and homeostasis.
What are the effects of positive feedback on DC servomotor?
Positive feedback in a DC servomotor can enhance system responsiveness and increase gain, leading to faster response times and improved tracking accuracy. However, excessive positive feedback can lead to instability, causing oscillations or uncontrollable behavior in the motor. It is crucial to balance feedback levels to achieve desired performance without compromising stability. Properly tuned, positive feedback can optimize performance in applications requiring precise control.
