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What is the difference between finite open loop gain and closed loop gain?
In a closed loop system the gain without the feed back loop being closed is called open loop gain!!! e.g if forward gain is "A" and feed back factor is "B" then open loop gain is "AB" and closed loop gain will be [A/(A+B)]
Why we don't prefer open loop configuration in case of linear circuit?
A: OPEN LOOP means the gain can be very high without the means to control the loop chances are that it will either saturate or oscillate
Examples of the open loop system?
The system without feedback is known as open loop system. The examples of the open loop system are bread toaster, oven ,washing machine. The open loop systems are inaccurate & less complex.
Why Positive Feedback can't use in Amplifier?
because +feedback amplify noise also.it amplify the noise to input ratio by[1/(1-G.H)]. WHERE g=open loop gain H=feedback gain
How is an oscillator Smith chart plot different from an amplifier Smith chart plot?
If you look at the reflection coefficient curve as a function of frequency, it follows a counter-clockwise direction about the Smith chart. You should see a loop, and at the "top" of the loop, that is the oscillation frequency.They both have in common an open-loop gain greater than one, however. So the curve will be outside the Smith chart.
Why voltage gain is high in op amp?
A practical opamp is designed to approach the characteristics of the ideal opamp as closely as possible. The open loop voltage gain of an ideal opamp is infinite, so while this is actually impossible to achieve practical opamps are built with as high an open loop voltage gain as possible.
Why open loop configuration of opamp not used in linear applications?
Open loop means max amplification of an amplifier. if the open loop is very it will probably oscillate since there is not a feedback to control it or it will go to one rail of the other saturated
What is the difference between finite open loop gain and closed loop gain?
In a closed loop system the gain without the feed back loop being closed is called open loop gain!!! e.g if forward gain is "A" and feed back factor is "B" then open loop gain is "AB" and closed loop gain will be [A/(A+B)]
What is the physical significance of infinite open loop voltage gain of an ideal operational amplifier?
Distortion is estimated as closed loop gain divided by open loop gain. If the open loop gain approaches infinity, distortion approaches zero.
Why we don't prefer open loop configuration in case of linear circuit?
A: OPEN LOOP means the gain can be very high without the means to control the loop chances are that it will either saturate or oscillate
Does an open loop gain of an op-amp change with a variation of the resistors and transistors inside the IC?
It could do, which is why an op-amp is made with a very high open-loop gain so that the actual gain can be closely controlled by the passive feedback components.
Is the gain same for same system in open loop and closed loop?
A: DEFINITELY NOT Open loop is defined as no feedback. any kind of negative feedback will reduce the gain
Is opamp a linear device?
A: It should be that is the normal operating mode. To be linear it strongly depends on negative feedback to maintain it into that linear region. By itself without any feedback it is very unstable due to the hi gain open loop availability
Is the gain same for the same system in open loop and close loop?
no.
If the gain of the open loop system is doubled then gain margin will become?
gain margin becomes half
How an operational amplifier can amplify DC signals?
It takes the difference between of two input and amplify by the open loop gain of the amplifier or closed loop gain of the amplifier. It is very hard to control open loop gain of 100 Db so it very seldom used
What is the open loop gain of an operational amplifier?
Ideally: infinite. Practically: very high, at least 1000 often several million maybe billions.
