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The amplifier is supposed to be an electronic circuit. Electronic circuits are nonlinear circuits, which may be modeled in the time domain by means of nonlinear differential equations and nonlinear algebraic equations. The kernel of the solution of the nonlinear equations is the solution of a linear equation system i.e. the nonlinear components and couplings are approximated with linear relations valid for small signals. Iterations are performed until the laws of Kirchhoff are fulfilled. The instant set of linear equations is the small signal model for the amplifier. If the amplifier is excited with a dc power source it assumes an active state called the bias point or quiescent point. If the relation between the input and the output signals of the amplifier is measured to be (almost) linear in the bias point then we assume a small signal amplifier with time independent bias point else we assume a large signal amplifier.
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What are advantages and disadvantages of multistage amplifier?
to amplify a small signal to sufficient level,so that it can travel to a large distance from first stage till the last stage
Can negative feedback amplifier work as a oscillator if yes how if no why?
All negative feedback systems, whether they be electronic, biological, or anything else, work by applying a negative feedback to the source signal, which is proportional in some way to the source signal. If the factor by which the amplifier corrects is high enough, oscillation will result (perhaps even runaway oscillation) How you make it happen depends upon the amplifier you use however -- though most work similarly enough. You could use a delay between output and feedback, or you could rely on a large amplifier gain.
Why power amplifier are called as large signal amplifiers?
in general the CE amplifiers are called low-signal amplifiers as they use only small values of voltage as a source of input which cant be used in practical purposes, whereas power amplifiers deal with practical values of input and output voltages
Why are there often so many steps between the original signal event and the cell's response?
Each step in a cascade produces a large number of activated products, causing signal amplification as the cascade progresses.
What do mean voltage amplification?
It's voltage that's being amplified by a voltage amplifier. Small changes in voltage at the input of the stage cause large changes of voltage at the output of the stage. That larger signal is then coupled out. The stage is said to have amplified the signal, amplified its voltage. And the stage's gain is a measure of how much. This is the simple answer. A further investigation into amplifiers and the underlying ideas in electronics will be needed to take this answer further.
Whats the main difference between small signal amplifier and large signal amplifier?
1.Small signal amplifier can be designed easily using s parameter while large signal amplifier not.
What is meant by the term large signal amplifier?
power amplifiers are the amplifier which raise the power levels of the signal.the power amplifier may also defined as a device which converts dc power to ac power and whose action is controlled by the ac input signal. Power amplifiers are also known as "LARGE SIGNAL AMPLIFIER".the term large signal arises because they use large part of load line for their operation,but the small signal amplifiers are use only 10% load line for their operation.
What are advantages and disadvantages of multistage amplifier?
to amplify a small signal to sufficient level,so that it can travel to a large distance from first stage till the last stage
What are the classifications of large signal amplifier?
LSA means that your amplifier will follow its specs also if you ask it to perform a large signal transition (ie fast output voltage change from rail to rail). In fact, bandwidth performances are given for small signal variation (a transition where output voltage variation is much smaller than rail to rail ).
Can negative feedback amplifier work as a oscillator if yes how if no why?
All negative feedback systems, whether they be electronic, biological, or anything else, work by applying a negative feedback to the source signal, which is proportional in some way to the source signal. If the factor by which the amplifier corrects is high enough, oscillation will result (perhaps even runaway oscillation) How you make it happen depends upon the amplifier you use however -- though most work similarly enough. You could use a delay between output and feedback, or you could rely on a large amplifier gain.
How does a cellphone repeater work?
A cell phone repeater is a bi-directional amplifier that is used to boost cell phone reception in an area. This is usually done with an antenna, a signal amplifier, and an internal antenna. Cell phone repeaters are also found inside large buildings to help with cell phone signal in a building.
What is the difference between small and large signal?
small signal basically it's about linear operation around the quiesient point. large signal is actually talking about "total signal". so just take both dc and ac into account.
Differentiate between an island and a lake?
A lake is a large body of River. while a island is a land filled with water
Is it necessary to purchase a signal booster for my cell phone?
There are various types of signal booster available in the market for a remote area where have limited access to reliable cell service. Whether you’re going to installing a signal amplifier for your cabin, small to a large one, Hiboost is your answer which provides an affordable and effective way to improve your cell signal.
What are the basic types of amplifiers?
based on i/p:a) small signal amplifier b) large signal amplifierbased on o/p:a) voltage amplifier b) power amplifier c) current ampbased on bandwidth:a)untuned amp(wideband) b)tuned amp(narrowband)based on biasing condition:a)class A amp b) class B amp ......e)class D amp f) class s ampbased on no. of stages:a)multistage amp b) single stage amp
How does a transister work as an amplifier?
The name is your clue: a transistor and a resistor (the load) are put in series. The output signal is taken from the load resistor. A small input signal (to the third lead of the transistor) will cause the transistor to change resistance ... thus you can get a large output from a small input Amplification.
What are the advantages of instrumentation amplifier over differential amplifier?
a differential amplifier helps to increase the CMRR which in turn helps avoid unwanted signals that couple into the input to get propagated. IT also helps to increase the signal to noise ratio. furthermore it provides larger output voltage swings.
